Handley Page aircraft

Hi,

The Handley Page aircraft was mentioned here in three pages,the first;
http://www.handleypage.com/Aircraft_page_1.html
The second;
http://www.handleypage.com/Aircraft_page_2.html
The third;
http://www.handleypage.com/Aircraft_page_3.html

The links are broken... Once again, may I suggest someone upload the contents of the original pages (if saved)? Thanks!

Via the Wayback Machine :-

http://web.archive.org/web/20080202102531/www.handleypage.com/Menu_page.html


cheers,
Robin.

Just in case, here are the project lists (annoyingly, they are images).

Thanks Paul! I came to the same realization after downloading the pages... Quite annoying, indeed!

I have now a complete list of Handley Page designations starting at the H.P.1 Bluebirdand going up to the H.P.137 Jetstream (plus the HPR.1 to HPR.8 series), except for the following:

• H.P.48 (said to have been reserved and not used... but reserved for what?)
• H.P.49 (said to have been reserved and not used... but reserved for what?)
• H.P.121
• H.P.136

Any help would be appreciated if you have even the slightest amount of information!

I've had my own go at the Handley Page designation systems. First up, the original letter system
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Handley Page Letter Type Designations - 1910 Series

Frederick Handley Page's first original aircraft design was named 'Bluebird' but it was also assigned a type - Type A. This type letter system remained in place until 1924 (with its common use continuing for some time after Handley Page adopted a new H.P. numbered type system). In 1912, horsepower was added to distinguish between potential variants. The first in this style was the Type E which, with its 50 hp Gnome rotary, was also described as the Handley Page E/50.

All very logical ... but it didn't last. Handley Page's 1915 Type O 'bloody paralyser' bomber was designated O/100 for its 100-foot wingspan. The developed Type O became the O/400 - returning once again to horsepower for the model number. But, in the case of the O/400, this referred to the nominal power of only one of its two engines. [1] Perversely, the next Handley Page bomber - the V/1500 of 1918 - had a designation based upon the total combined power of all four of its engines.

After WWI, Handley Page began shortening designations. For example, a one-off transport derivative of the O/400 was the W/400, a designation soon contracted to W/4. The pattern was followed by the Type O airliner derivatives. A contemporary of the W/400 was the O/700 was later contracted to O/7. The O/10 and O/11 developments of 1920 seem to be original designation - ie: no 'O/1000' or 'O/1100'. But confusion had begun to set it.

Perhaps the '700' in O/700 referred to total horsepower? [2] However, there's no such 'wiggle room' for the O/10 or O/11 models ... which, initially at least, had the same engine power as the O/7. Developed versions of the W/4 were the W.8 series, in keeping with total engine power. But the reason for a change in designation style from slashes to periods for the W.8 series is unknown.

Perhaps weary of running out of sensible designation numbers, Handley Page began applied sub-type suffix letters. Each major sub-types - including unbuilt projects - were assigned a small letter suffice. [3] So, in the case of the W.8, the prototype was simply a W.8, followed by the unbuilt W.8a of 1919, the W.8b of 1921, and so on.

One trails aircraft - an Airco DH.9A rebuilt as a monoplane to test Handley Page slots - was given the designation X.4B. It is not clear if this refers to a 'Type X'. If it does, that '4' matches the power of the DH.9A's 400 hp Liberty 12-N engine. But what does that 'B' refer to? There was an earlier DH.9 biplane fitted with fixed Handley Page slots. Was that DH.9 given an 'X' designation with an 'A' suffix? [4] Even if it was, why the Capital letter suffixes? Perhaps a foreshadowing of what was to come?

I can find even less evidence of any 'Type Y' or 'Type Z'. Still, the problem for the Handley Page designation system was obvious. Even when using sub-type suffixes, Handley Page was running out of alphabet for Type letters.

The short-term result was the re-use of earlier letters in the early 1920s (next post). The longer-term result was a complete rationalizing of Handley Page designations using a new 'H.P.' numbering system (third post).

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[1] Two planned 1917 derivatives - the Type S seaplane and the Type T flying boat - followed the new pattern as the S/400 and T/100.

[2] This would have been consistent with the designation style of the 1918 V/1500 bomber.

[3] Over time, popular rendering of those sub-types letters with Capitals became more common.
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Pre-1924 Handley Page Type Letter Designations

Type A - 1909-10 'Bluebird' shoulder-wing monoplane*
- H.P.1: 1 x 20 hp Advance V-4, span 9.91 m, x 1
-- * José Weiss patent, no control warping or ailerons
-- Type A/H.P.1 crashed, then rebuilt as Type C/H.P.3
-- http://flyingmachines.ru/Images7/Putnam/HP/59-1.jpg
-- Retroactive 1924 'H.P.' designation: H.P.1

Type B - 1909 Type B twin pusher-props* biplane, x 1
-- Type B constr. commiss'd by designer, W.P. Thompson
- Type B: 1 x 60 hp Green 4-cyl., 2 x chain-drive props
-- Type B rebuilt at Barking as Planes Limited Biplane
-- * In rebuilt form, aircraft had only a single prop
-- Retroactive 1924 'H.P.' designation: H.P.2

Type C - 1910 shoulder-wing monoplane, rebuilt Type A
- Type C: 1 x 25 hp Alvaston flat-twin,* span 9.90 m
-- * Water-cooled, horizontally-opposed engine
- Type C: Imp. control, wing-warping & enlarged rudder
-- Type A rebuild post-crash landing, refused to fly
-- http://flyingmachines.ru/Images7/Putnam/HP/60-1.jpg
-- Retroactive 1924 'H.P.' designation: H.P.3

Type D - 1911 'Antiseptic' monoplane, Weiss patent wing*
- Type D: Mk.I, 1 x 35 hp Green 4-cyl inline, span 9.76 m
- Type D: Mk.II, 1 x 50 hp Isaacson 5-cyl radial engine
-- * Improved shoulder-wing design with wing-warp controls
-- 'Antiseptic' nickname came from colour of preservative
-- https://www.flightglobal.com/pdfarchive/view/1913/1913 - 0180.html
-- 3v: https://www.flightglobal.com/pdfarchive/view/1912/1912 - 0964.html
-- Retroactive 1924 'H.P.' designation: H.P.4

Type E - 1912 'Antiseptic' 2-seat* shoulder-wing monoplane
- Type E: 1 x 50 hp Gnome 7-cyl rotary engine, span 12.9 m
-- * Enlarged tandem-seat Type D deriv. meant for military
-- aka Handley Page E/50, ailerons added to Type E in 1913
-- Retroactive 1924 'H.P.' designation: H.P.5

Type F - 1912 side-by-side 2-seat* shoulder-wing monoplane**
- Type F: 1 x 70 hp Gnome 9-cyl rotary,*** span 13.70 m
-- * Side-by-side cockpit sited beneath king-post struts
-- ** Similar to Type E, intended for military use
-- *** Neatly-cowled, Type F crashed on 15 Dec 1912
-- aka F/70, retroactive 1924 'H.P.' designation: H.P.6

Type G - 1913 inherently-stable 3-bay crescent-wing biplane
- Type G: 100 hp Anzani 10 10-cyl. radial, span 12.20 m
-- Intended as RFC BE.2 repl., pilot + one (or two) pax
-- aka G/100, written off in RNAS service during Aug 1915
-- 3v: https://www.flightglobal.com/pdfarchive/view/1913/1913 - 1271.html
-- Retroactive 1924 'H.P.' designation: H.P.7

Type H - [Project] 1913 monoplane, two separate projects
- Type H: aka H/70, improved Type F,** by HA Petre
- H/70 : 1 x 70 hp Gnome, span 13.70 m, drg. No 542
-- ** Poss. Henry Petre's alt., tapered wing for F/70
- Type H: aka H/110, improved Type E,* by GR Volkert
- H/110: 1 x 110 hp Anzani, span (??) m, drg. No 590
-- * Single, elongated cockpit, fuel tank moved aft
-- http://flyingmachines.ru/Site2/Crafts/Craft29592.htm
-- Retroactive 1924 'H.P.' designations: None applied

Type I - Letter not assigned

Type J - Possibly a "bombing machine" (see Reply #10)

Type K - [Project] 1913 single-seat biplane, aka K/35
- Type K: 1 x 35 hp Anzani, span 9.15 m, area 20.9 m2
- Type K: Three-quarter scale, single-seat Type G deriv.
-- Jan 1914 redesign, BE2a-style tail, revised u/c
-- Const. canc. to facilitate Type G devel. & repair
-- Retroactive 1924 'H.P.' designation: None applied

Type L - 1914 long-distance record biplane,* aka L/200
- Type L: 1 x 200 hp Salmson 2M.7 radial, span 18.30 m
- Type L: Commiss'd for Daily Mail Trans-Atlantic prize
-- * Basically Type K scaled-up to 2 x linear dimens.
-- Airframe completed but engine requis. by Admiralty
-- Retroactive 1924 'H.P.' designation: H.P.8

Type M - [Project] 1914 twin-engine 4-seat military biplane
- Type M: Land/seaplane L/200 deriv's offered to Admiralty
- M/200 : Coastal defence a/c, 2 x 95 hp Salmson radials
-- L/200 airframe with engines mounted on each 21.38 m wings
- MS/200 [Project] seaplane deriv. of coastal defence a/c
-- Retroactive 1924 'H.P.' designations: None applied

Type N - [Project] 1914 2-seater* biplane scout aircraft
- Type N : 1 x 80 hp Gnome 9-cyl. rotary, span 9.90 m
-- * With pilot and observer seated side-by-side**
-- ** Some sources claim N/80 was a single-seater***
-- *** Poss. confusion over single, open ?cockpit
- Type N: aka N/80, retroactive 1924 desig.: H.P.10

Type O - 1915 twin-engined biplane heavy bomber series
- O/100 * : 1915 2 x various V-12s,** span 30.48 m
-- * Designation based on 100' span, not on engines
-- ** 260 hp R-R Eagles; 260 hp Fiat A.12bis (x 1);
-- ** 260 hp Sunbeam Maoris (x 1); 260 hp RAF 3a (x 1);
-- ** 320 hp Sunbeam Cossacks (x 6); 200 hp HS 8s ***
-- *** 4 x tandem pair 200 hp Hispano-Suiza 8s (x 4)
- Type O: aka O/100, retroactive 1924 desig.: H.P.11

- O/400: 1916 Impr'd heavy bomber for RNAS/RAF, x 554
- O/400: 2 x various V-12 engines,* span 30.48 m
-- * R-R Eagle VIIIs, Sunbeam Maori, Liberty 12, Fiat A.12bis
-- 3v: http://flyingmachines.ru/Images7/Putnam/HP/107-1.jpg
-- Liberty: http://flyingmachines.ru/Images7/Putnam/HP/124-1.jpg
-- 3v: http://flyingmachines.ru/Images7/02-Bombers/Janes/HP_400-p.jpg
-- US: http://flyingmachines.ru/Images7/02-Bombers/Web/HP-O-400-unk_02.jpg

- O/7 : 1919 14-pax cabin airliner conver. of O/400 bomber
- O/7 : 2 x 360 hp R-R Eagle VIII V-12s, span 30.48 m
-- * 1922, O/10 G-EATK conv. to Bristol Jupiter radials
-- O/7 : http://flyingmachines.ru/Images7/Putnam/HP/113-2.jpg
-- 3v: http://flyingmachines.ru/Images7/Putnam/HP/173-1.jpg
-- aka O/700, retroactive 1924 designation: H.P.12

- O/10: 1920 12-pax cabin conv., Handley Page Transport Ltd
- O/10: 2 x 360 hp R-R Eagle VIII V-12s, span 30.48 m
-- * 1922, O/10 G-EATK conv. to Bristol Jupiter radials
-- http://flyingmachines.ru/Images7/Putnam/Bi2Mono/16-2.jpg

- O/11: 1920 mixed 5-passenger/cargo cabin conv. of O/400
-- For Handley Page Transport & HP Indo-Burmese Transport
-- http://flyingmachines.ru/Images7/Putnam/HP/170-2.jpg

Type P - [Project] 1916-17 2-seat naval shipboard scout
- Type P: (Orig.) Biplane, 1 x 200 hp Hispano-Suiza V-8
- Type P: (Revised) Triplane, 1 x 320 hp Sunbeam Cossack
-- Type P : aka P/320, 2 x order (N519-N520), cancelled*
-- * Type P concept eclipsed by more promising Type R
-- Retroactive 1924 'H.P.' designation: H.P.13

Type Q - Letter not assigned

Type R -- 1917 landplane/seaplane recce-fighter, x 3
- Type R : 1 x 200 hp Hispano-Suiza V-8, span 10.97 m
-- Single-bay biplane w/ ailerons/camber-changing flaps
-- Orig. desig. R/200, x 3 (product'n order cancelled)
-- 2 x floatplanes (N27 and N28) + 1 x landplane (N29)
-- http://flyingmachines.ru/Images7/Putnam/HP/126-1.jpg
-- http://flyingmachines.ru/Images7/Putnam/HP/127-1.jpg
-- 3v: http://flyingmachines.ru/Images7/Putnam/HP/128-1.jpg
-- Retroactive 1924 'H.P.' designation: H.P.14

Type S - [Project] 2 types, 1917 flying boat, 1921 fighter
- Type S (1): 1917 twin-float seaplane deriv. of O/400
- Type S (1): 2 x 300 hp R-R Eagle VIIIs, span 30.48 m
-- aka S/400; based on inception date, assume military use*
-- * Despite date, some source claim S/400 for civilian use
-- Retroactive 1924 'H.P.' designation: None applied
- Type S (2): 1923 Type S naval carrier fighter, x 2
- Type S: Single-seater to US Navy VF specification
- aka HPS (Handley Page Scout), 230 hp Bentley BR2
-- Retroactive 1924 'H.P.' designation: H.P.21

Type T - [Project] 2 types, 1917 flying boat/carrier bombers
- Type T (1): 1917 military flying boat deriv. of O/400
- Type T (2): 2 x 300 hp R-R Eagle VIIIs, span 30.48 m
-- aka T/400, retroactive 1924 designation: H.P.19
- Type T (2): 1922 Hanley biplane carrier torpedo-bomber, x 3
- Type T (2): 1 x 450 hp Napier Lion IIB W-12, span 14.00 m
-- Retroactive 1924 'H.P.' designation: H.P.19
- Type Ta : 1924 Hendon biplane carrier torpedo-bomber, x 6
- H.P.25: 1 x 450 hp Napier Lion IIB W-12, span 14.00 m
-- Retroactive 1924 'H.P.' designation: H.P.25

Type U - Letter not assigned

Type V - 1918 tandem 4-engined* biplane heavy bomber
- V/1500: 4-bay long-span wings, span 38.41 m, x 63
-- * Mounted in tandem push/pull pairs between wings
- Type V: (Planned) 2 x 600 hp Rolls-Royce Condors
- V/1500: (As built) 4 x 375 hp R-R Eagle VIIIs **
-- ** or Napier Lion W-12s; Galloway Atlantic V-12s
-- https://collection.maas.museum/object/213301
- V/1500 : 1919 J6573 mod, 4 x 450 hp Napier Lion IBs
- V/1500 Atlantic : F7140, long-range modifications
- 3v: http://flyingmachines.ru/Images7/Putnam/HP/154-1.jpg
-- Retroactive 1924 'H.P.' designation: H.P.15

Type W - 1919 transport devel. of O/400 bomber, x 1
- Type W: (As planned) 3-abreast seating for 12 pax
- Type W: (As built) orig. width, lengthened fuselage
- Type W: 2 x 360 hp R-R Eagle VIIIs, span 25.90 m*
-- * Equal span wings, single-fin/rudder tailplane
-- aka Handley Page W/400, later contracted to W/4
-- W/4 likely conv. from O/400 C9713, reg. 'HP-15'
-- https://www.flightglobal.com/FlightPDFArchive/1961/1961 - 0056.PDF
-- Retroactive 1924 'H.P.' designation: H.P.16

- W.8: 1919 O/400 airliner derivative, span 22.92 m
-- W.8 G-EAPJ orig. to have Cosmos Jupiter radials
-- Jupiters not ready, repl. by Napier Lions IBs *
-- * 450 hp, later de-rated to 360 hp to mimic Eagle
-- Retroactive 1924 'H.P.' designation: H.P.18
- W.8a: [Project] 1919 W.8 w/ Cosmos Jupiter radials
-- W.8a, reg. G-EAVJ, was also to have HP LE slots
-- Model: http://flyingmachines.ru/Images7/Putnam/HP/184-1.jpg
-- https://www.flightglobal.com/FlightPDFArchive/1961/1961 - 0056.PDF
- W.8b: 1921-22 R-R Eagle-powered prod. vers., 2+12 pax
-- W.8b: 2 x 360 hp R-R Eagle VIII V-12s, span 22.86 m
-- http://www.belgian-wings.be/images/CivilPics/hpw_8e-OO-AHL-landing-at-Haren.jpg
-- W.8b 3v: http://airwar.ru/image/idop/cw1/hpw8/hpw8-1.gif
- W.8c: 1923, 2 x Rolls-Royce Eagle IX, span 22.86 m
-- 3v: http://aviadejavu.ru/Images6/FT/FT1922/11/669-3.jpg
- W.8d: [Project] Bomber derivative, 2 x R-R Eagle IXs
-- W.8d bomber deriv. developed into H.P.24 Hybrabad
-- W.8d 3v: http://aviadejavu.ru/Images6/FT/FT1926/12/894-1.jpg
-- Retroactive 1924 'H.P.' designation: H.P.18
- W.8e: 1924 trimotor development for Belgian Sabena
-- W.8E: 1 built by HP, 3 built under license by SABCA
-- W.8e: 1 x 360 hp Eagle IX, 2 x 240 hp Siddeley Puma
- W.8f: Hamilton W.8e devel. for Imperial Airways,* x 1
-- * 12 pax, essentially sim. to W.8e but w/ cabin heating
-- http://aviadejavu.ru/Images6/JS/Janes/vol3/208-1.jpg
-- 3v: http://aviadejavu.ru/Images6/FT/FT1924/05/249-1.jpg
- W.8g, 1929 mod, twin-engined devel.,** W.10 tail/rudder
-- ** No nose engine, 2 x wing-mounted R-R Eagle IX V-12s
-- 1929 mod was the ex-W.8f G-EBIX, 'City of Washington'
-- Retroactive 1924 'H.P.' designation: H.P.26

- W.9: 1925 Hampstead, 14-pax hi-perf. W.8e deriv., x 1
-- W.9: 3 x 385 hp AS Jaguar IVs radials,* span 24.07 m
-- 1926 mod., 3 x 450 hp Bristol Jupiter VI 9-cyl radials
-- http://aviadejavu.ru/Images6/FT/FT1926/11/828-1.jpg
-- http://aviadejavu.ru/Images6/FT/FT1925/11/777-2.jpg
-- 3v: https://www.flightglobal.com/FlightPDFArchive/1925/1925 - 0626.PDF
-- https://www.flightglobal.com/FlightPDFArchive/1925/1925 - 0625.PDF

- W.10: 1926 twin-engined W.8b deriv. for Imperial Airways
-- W.10: 2 x 450 hp Napier Lion IIBs, span 24.07 m, x 4
-- Retroactive 1924 designation: H.P.30
-- http://aviadejavu.ru/Images6/FT/FT1931/10/1055-2.jpg
-- https://www.airteamimages.com/pics/116/116640_big.jpg

Type X - Multiple projects related to HP slots
- X.4a: Airco DH.9 biplane conv. lower wing slots
-- Retroactive 1924 designation: H.P.17
- X.4b: DH.9A monoplane conv., LE slots + slotted flaps
-- Retroactive 1924 designation: H.P.20
-- https://www.flightglobal.com/pdfarchive/view/1921/1921 - 0732.html
- Type X : [Project] Bomber, aka 'Type X Bomber'
-- No details other than using slotted wing
- Type X : [Project] Transport, aka 'Type X Transport' monoplane
- Type X : 1 x 360 hp R-R or 450 hp Napier Lion, span 16.00 m
-- https://www.secretprojects.co.uk/threads/handley-page-aircraft-projects.32230/#post-359281

Type Y - Letter not assigned

Type Z - Letter not assigned

Second Handley-Page Type Letter Designation System

By the early '20s, Handley Page had began re-using 'earlier' letters for Type designations. There are a number of gaps - although I'm unsure of whether this is due to lapses in application or simply gaps in my knowledge. Either way, some speculation is needed in regards to the 1923 Handley Page type letter designation system.

In 1923, the designation C/7 was applied to what would later be known as the H.P.28 Handcross. Similarly, the unbuilt H.P.29 biplane transport project was initially known as the D/4. These are presumably part of the letter Type recycling but follow the designation form of the earlier X/4B. If so, C/7 might be short for Type C/700 hp (the Handcross having a 670 hp Condor). Unfortunately, the engine power of the proposed D/4 design [single Jupiter?] is unknown (at least to me) so no pattern can be established.

In this re-start of HP Type letters, there is no sign of the new Type A or Type B. Pure speculation, of course, but the two related HP designs for the 1923 Lympne light aircraft trials remained apparently undesignated. Perhaps what became the H.P.22 and H.P.23 had actually begun life as the new 'Type A' and 'Type B"?

There is room for other speculation as well. Since the Hinaidi II was the Type M (second use), it makes sense that the Hinaidi I bomber and Clive I transports would have also received Type letters. Perhaps Hinaidi I and Clive I are the 'missing' Type K (second use) and Type L (second use), respectively?

If anyone can add info to confirm or fill some these gaps, it'd be much appreciated.

An oddity of these 'second use' Type letters is that they were being applied into the late 1920s when Handley Page had already made begun an attempt to rationalize its designation system in 1924. It is possible that this second Type letter system was meant to be the 'public face' while the 'H.P.' numbers were originally intended for purely internal use.
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1923 - A Re-Start to Handley Page Type Letters

These new Type letters were:

Type A (second use) - unknown, possibly not assigned

Type B (second use) - unknown, possibly not assigned

Type C (second use) - possibly C/7 Handcross (see below)
-- Retroactive 1924 'H.P.' designation: H.P.28

Type D (second use) - 2 types, 1924 and 1926-28 transports
- Type D (1) : [Project] 1924 D/4 biplane transport
-- Retroactive 1924 'H.P.' designation: H.P.29
- Type D (2) : 1926 Hamlet trimotor monoplane transport
- Type D (2) : 1927 Hamlet 2-engined monoplane transport
- Type D (2) : 1928 Hamlet trimotor monoplane transport
-- Retroactive 1924 'H.P.' designation: H.P.32

Type E (second use) - Harrow shipboard torpedo-bomber
-- Retroactive 1924 'H.P.' designation: H.P.31

Type F (second use) - [Project] Unbuilt shipboard fighter
- Type F: To AirMin Specification O.22/26
-- Retroactive 1924 'H.P.' designation: H.P.37

Type G (second use) - unknown

Type H (second use) - Hare biplane bomber
-- Retroactive 1924 'H.P.' designation: H.P.34

Type K (second use) - unknown

Type L (second use) - unknown

Type M (second use) - Hinaidi II biplane bomber
-- Retroactive 1924 'H.P.' designation: H.P.36

For completeness, here is my version of the complete H.P. Number designation list to 27 February 1970 when Handley Page finally collapsed. The firm went into voluntary liquidation in March 1970.

Handley Page Ltd had already gone into liquidation in August 1969 but there were on-going attempts to keep the company running. The receivers proposed reorganizing the company as Handley Page Aircraft Ltd with a cash infusion from Barclays Bank.

At the same time, International Jetstream Corporation was formed as a subsidiary of the KR Craven Group of St Louis, MO, as a sales agent for HP's Jetstream programme. Jetstream production was taken over by Scottish Aviation, Ltd of Prestwick. In March 1977, Scottish Aviation was merged into British Aerospace ... precisely the fate that Sir Frederick Handley Page had struggled so long to avoid!

______________________

Handley Page H.P. Type Number System - 1924-1970

H.P.1 --- 1909-10 Type A 'Bluebird' shoulder-wing monoplane*
- H.P.1: 1 x 20 hp Advance V-4, span 9.91 m, x 1
-- * José Weiss patent, no control warping or ailerons
-- Type A/H.P.1 crashed, then rebuilt as Type C/H.P.3
-- http://flyingmachines.ru/Images7/Putnam/HP/59-1.jpg

H.P.2 --- 1909 Type B twin pusher-props* biplane, x 1
-- Type B constr. commiss'd by designer, W.P. Thompson
- H.P.2: 1 x 60 hp Green 4-cyl., 2 x chain-drive props
-- Type B rebuilt at Barking as Planes Limited Biplane
-- * In rebuilt form, aircraft had only a single prop

H.P.3 --- 1910 Type C shoulder-wing monoplane, rebuilt H.P.1
- H.P.3: 1 x 25 hp Alvaston flat-twin,* span 9.90 m, x 1
-- * Water-cooled, horizontally-opposed engine
- H.P.3: Control improved w/ wing-warping, enlarged rudder
-- H.P. 1/Type A rebuild post-crash landing, refused to fly
-- http://flyingmachines.ru/Images7/Putnam/HP/60-1.jpg

H.P.4 --- 1911 Type D 'Antiseptic', José Weiss patent wing*
- H.P.4: Mk.I, 1 x 35 hp Green 4-cyl inline, span 9.76 m
- H.P.4: Mk.II, 1 x 50 hp Isaacson 5-cyl radial engine
-- * Improved shoulder-wing design with wing-warp controls
-- 'Antiseptic' nickname came from colour of preservative

H.P.5 --- 1912 Type E tandem-seat shoulder-wing monoplane*
- H.P.5: 1 x 50 hp Gnome 7-cyl rotary engine, span 12.9 m
-- * Enlarged 2-seat Type D deriv. intended for military
-- Orig. desig. Handley Page E/50, ailerons added in 1913

H.P.6 --- 1912 Type F 2-seat* shoulder-wing monoplane**
- H.P.6: 1 x 70 hp Gnome 9-cyl rotary,*** span 13.70 m
-- * Side-by-side seating beneath king post struts
-- ** Similar to Type E/H.P.5, intended for military use
-- *** Neatly-cowled, Type F/H.P.6 crashed on 15 Dec 1912

H.P.7 --- 1913 Type G, inherently stable 3-bay biplane*
- H.P.7: 100 hp Anzani 10 10-cyl. radial, span 12.20 m
-- * Crescent wings, intended as RFC BE.2 replacement
-- H.P.7/Type G carried pilot + one (or two) passengers
-- Orig. desig. G/100, w/o in RNAS service in Aug 1915
-- 3v: http://flyingmachines.ru/Images7/Putnam/Brit_Early/155-3.jpg

H.P.8 --- [Project] 1914 Type L record a/c, aka L/200
- H.P.8: 2 x 200 hp Salmson 2M.7 radials, span 18.00 m
-- Commissioned Trans-Atlantic a/c for Daily Mail prize
-- Type L/H.P.8 was effectively a scaled-up Type G

H.P.9 --- [Project] 1914 Type M coastal defence a/c
- H.P.9: 2-seat biplane, landplane or seaplane config.
- H.P.9: 2 x 95 hp Salmson radials,* span 21.38 m
-- * Engines mounted nose-to-nose in fuselage**
-- ** Each engine chain-driving one wing-mounted prop
-- Orig. desig. M/200, derived from Type L (L/200)
- MS/200 [Project] seaplane deriv. offered to Admiralty
-- Twin main floats fwd, tail-mounted stabilizing float
-- 3v: http://flyingmachines.ru/Images7/Putnam/HP/80-1.jpg

H.P.10 -- [Project] 1914 Type N biplane scout aircraft
- H.P.10: 1 x 80 hp Gnome, span 9.90 m, two-seater*
- H.P.10: Original designation Handley Page N/80
-- * With pilot and observer seated side-by-side**
-- ** Some sources claim N/80 was a single-seater

H.P.11 -- 1915 Type O twin-engined biplane heavy bomber
-- Orig. desig. Handley Page O/100, based on 100' span
- H.P.11: 2 x 260 hp R-R Eagle V-12,* span 30.48 m
-- * Alt: 2 x 260 hp Fiat A.12bis, 1 built for Russia
-- * Alt: 2 x 260 hp Sunbeam Maori V-12s, 1 x built
-- * Alt: 2 x 260 hp RAF 3a (specially boosted), x 1
-- * Alt: 2 x 320 hp Sunbeam Cossack V-12s, 6 x built
-- * Alt: 4 x tandem pair 200 hp Hispano-Suiza 8s, x 4

H.P.12 -- 1916 Type O twin-engined biplane heavy bomber
- H.P.12: 2 x 360 hp R-R Eagle VIIIs,* span 30.48 m
-- Orig. desig. O/400, imp. bomber for RNAS/RAF, x 554
-- 3v: http://flyingmachines.ru/Images7/Putnam/HP/107-1.jpg
-- * Alt.: Sunbeam Maori, Liberty 12, Fiat A.12bis**
-- ** 1922 O/10 conv. to 2 x Bristol Jupiters, G-EATK
-- Liberty: http://flyingmachines.ru/Images7/Putnam/HP/124-1.jpg
-- 3v: http://flyingmachines.ru/Images7/02-Bombers/Janes/HP_400-p.jpg
-- US: http://flyingmachines.ru/Images7/02-Bombers/Web/HP-O-400-unk_02.jpg
-- Type S, S/400 [Project] 1917 twin-float seaplane***
-- Despite its date, some source claim S/400 for civil use
-- Type T, T/400 [Project] Flying boat derived from O/400
-- O/7 : 1919 14-pax cabin airliner conver., orig. O/700
-- O/7 : http://flyingmachines.ru/Images7/Putnam/HP/113-2.jpg
-- 3v: http://flyingmachines.ru/Images7/Putnam/HP/173-1.jpg
-- O/10: 1920 12-pax cabin conv., Handley Page Transport Ltd
-- http://flyingmachines.ru/Images7/Putnam/Bi2Mono/16-2.jpg
-- 1922, 1 x O/10 (G-EATK) conv. to 2 x Bristol Jupiters
-- O/11: 1920 mixed cargo/passenger (x 5) cabin convers.
-- ** For Handley Page Transport & HP Indo-Burmese Transport
-- http://flyingmachines.ru/Images7/Putnam/HP/170-2.jpg

H.P.13 -- [Project] 1916-17 Type P 2-seat shipboard scout
- H.P.13: (Orig.) Biplane, 1 x 200 hp Hispano-Suiza V-8
- H.P.13: (Revised) Triplane, 1 x 320 hp Sunbeam Cossack
-- H.P.13: aka P/320, 2 x order (N519-N520), cancelled*
-- * H.P.13 concept eclipsed by more promising H.P.14

H.P.14 -- 1917 Type R land/seaplane recce-fighter, x 3
- H.P.14 : 1 x 200 hp Hispano-Suiza V-8, span 10.97 m
-- Single-bay biplane w/ ailerons/camber-changing flaps
-- Orig. desig. R/200, x 3 (product'n order cancelled)
-- 2 x floatplanes (N27 and N28) + 1 x landplane (N29)
-- http://flyingmachines.ru/Images7/Putnam/HP/126-1.jpg
-- http://flyingmachines.ru/Images7/Putnam/HP/127-1.jpg
-- 3v: http://flyingmachines.ru/Images7/Putnam/HP/128-1.jpg

H.P.15 -- 1918 Type V 4-engined biplane heavy bomber
-- Orig. desig. V/1500, nicknamed 'Super Handley'
- H.P.15: 4-bay long-span wings, span 38.41 m, x 63
- H.P.15: (Planned) 2 x 600 hp Rolls-Royce Condors
- H.P.15: (As built) 4 x 375 hp R-R Eagle VIIIs*
-- * In tandem push/pull pairs between wings **
-- ** Alts: 4 x 450 hp Napier Lion IB W-12 engines
-- ** Alts: 4 x 500 hp Galloway Atlantic V-12s
-- https://collection.maas.museum/object/213301
- H.P.15: 1919 J6573 mod, 4 x 450 hp Napier Lions
-- V/1500 Atlantic: F7140, long-range modifications
- 3v: http://flyingmachines.ru/Images7/Putnam/HP/154-1.jpg

H.P.16 -- 1919 Type W, O/400 transport deriv., x 1
- H.P.16: 2 x 360 hp R-R Eagle VIIIs, span 25.90 m*
-- * Equal span wings, single-fin/rudder tailplane
- H.P.16: Orig. desig. Handley Page W/4 or W/400**
-- ** Some sources say W.8 orig. desig. was W/400
-- Likely conv. from O/400 C9713, HP reg. 'HP-15'
-- https://www.flightglobal.com/FlightPDFArchive/1961/1961%20-%200056.PDF

H.P.17 -- 1919* Airco DH.9 with Handley-Page slots
- H.P.17: HP slots fitted to standard DH.9 wings**
- H.P.17: 1 x 240 hp Siddeley Puma, span 13.94 m
-- * Some sources list 1920 date for H.P.17 conv.
-- ** Fixed slots fitted to upper and lower wings
-- http://aviadejavu.ru/Images6/FT/FT1920/10/1121-2.jpg

H.P.18 -- 1919 Type W, O/400 airliner derivatives
- H.P.18 : 1919 W.8 transport prototype, G-EAPJ
-- Orig. to powered by Cosmos Jupiter radials*
-- * Not ready, replaced by 450 hp Napier Lions
- H.P.18 : [Project] 1919 W.8a, Cosmos Jupiters
-- https://www.flightglobal.com/FlightPDFArchive/1961/1961%20-%200056.PDF
- H.P.18 : 1921 W.8b, R-R Eagle IXs, 2 + 12 pax
-- W.8b: 2 x Rolls-Royce Eagle IX, span 22.86 m
-- W.8b 3v: http://airwar.ru/image/idop/cw1/hpw8/hpw8-1.gif
- H.P.18 : 1923 W.8c, 2 x Rolls-Royce Eagle IX
- H.P.18 : [Project] W.8d bomber, 2 x Eagle IXs
-- W.8d bomber deriv. devel. into H.P.24 Hybrabad
-- W.8d 3v: http://aviadejavu.ru/Images6/FT/FT1926/12/894-1.jpg

H.P.19 -- 1922 Hanley carrier-based torpedo-bomber, x 3
- H.P.19: 1 x 450 hp Napier Lion IIB W-12, span 14.00 m
- H.P.19: (As built) 3-bay biplane, upper & lower slots
-- H.P.19 Hanley Mk.I, very poor low-speed handling
- H.P.19: (As mod'd) 2-bay biplane, revised wingtips
-- H.P.19 Hanley Mk.II, performance still poor
- H.P.19: 3rd prototype, to Mk.II std + revised slots
-- H.P.19 Hanley Mk.III, Blackburn Dart chosen by AM
-- H.P.19 to meet AirMin Specification 3/20, aka Type T
-- http://www.aviastar.org/pictures/england/handley_hanley.jpg
-- https://www.flightglobal.com/pdfarchive/view/1922/1922%20-%200697.html
-- 3v: http://aviadejavu.ru/Images6/FT/FT1922/11/698-1.jpg

H.P.20 -- 1921 DH.9A monoplane w/ Handley-Page slots, x 1
- H.P.20: DH.9A fuselage w/ parasol monoplane,* aka X.4B
- H.P.20: 1 x 400 hp Liberty 12-N V-12, span 14.50 m
-- Testing HP leading wing slots and slotted flaps
-- * Wing on pedestal, single-seater (rear cockpit)
-- https://www.flightglobal.com/pdfarchive/view/1921/1921%20-%200732.html

H.P.21 -- 1923 Type S single-seat naval fighter, x 2
- H.P.21: 1 x 230 hp Bentley BR2 rotary, span 8.92 m *
-- * Low, cantilever wing with HP leading edge slots
-- Built to 1921 US Navy Department VF specification
-- Known to USN customer as HPS (Handley Page Scout)**
-- ** Often mistakenly listed as 'HPS-1' for type desig.
-- HPS-1: 1923 1st proto. (A6402), directional problems
-- HPS-2: 1924 2nd proto. (A6403), w/o Martlesham Heath
-- HPS-3: Seaplane proto. (A6404), canc., not completed
-- http://www.airwar.ru/image/idop/fww1/hp21/hp21-7.jpg
-- 3v: http://www.airwar.ru/image/idop/fww1/hp21/hp21-1.gif

H.P.22 -- 1923 single-seat ultralight monoplane, x 2
-- H.P.22s built for 1923 Lympne light aircraft trials
- H.P.22: 1 x 3.5 hp Douglas HO2 engine, span 11.13 m
- H.P.22: No 23, High-wing monoplane, engine on pylon*
-- * To wing height, otherwise similar to SCW glider
-- https://www.flightglobal.com/pdfarchive/view/1923/1923%20-%200626.html
-- 3v: http://aviadejavu.ru/Images6/FT/FT1922/10/614-1.jpg
- H.P.22: No 25 (as built) high-winged (as per No 23)
-- No 25: (as built) 1 x 8 hp ABC Scorpion HO2 engine
- H.P.22: No 25 (as flown), shoulder-wing monoplane
-- No 25: (as flown) 1 x 3.5 hp Douglas HO2, span 11.13 m
-- https://www.flightglobal.com/pdfarchive/view/1923/1923%20-%200640.html
-- aka Sayers-Handley Page monoplane (Captain WH Sayers)

H.P.23 -- 1923 ultralight monoplane, slotted wing
-- H.P.23 built for 1923 Lympne light aircraft trials
- H.P.23: 1 x 6 hp Blackburne OHV V-2, span 11.13 m
- H.P.23: No 26, High-wing monoplane, nose engine*
-- * As opposed to raised pylon on nose of H.P.22s
-- Sim. to H.P.22 but optimized for speed not endur.
-- https://www.flightglobal.com/pdfarchive/view/1923/1923%20-%200626.html
-- aka Sayers-Handley Page monoplane

H.P.24 -- 1923 Type W Hyderabad biplane heavy bomber, x 44
-- W.8d : Prototype delivered to A&AEE, Martlesham Heath
-- Bomber to AM Spec 31/22 for Vickers Vimy replacement*
- H.P.24: 2 x 500 hp Napier Lion Vs or VAs, span 22.87 m
- H.P.24: Orig. W.8d, bomber devel. of W.8 series airliner
-- * Actually, first repl. Avro Aldershots with No.99 Sqn
-- 3v: http://aviadejavu.ru/Images6/MM/MM-149/1014-07-1-3.jpg

H.P.25 -- 1924 Type T Hendon biplane torpedo-bomber, x 6
- H.P.25: 1 x 450 hp Napier Lion IIB W-12, span 14.00 m
-- H.P.25 was a 2-seat shipboard biplane for Royal Navy
-- Orig. desig.: Handley Page Type Ta, to AM Spec 25/23
-- Hendon essentially a 2-seat deriv. of H.P.19 Hanley*
-- Hendon I : With leading edge slots, aka Hanley III
-- Hendon II: Improved LE slots, 3 x Hendon I conver's
-- Hendon III: Slotted flaps added, 1 x Hendon II conv.

H.P.26 -- 1924 Hamilton trimotor biplane airliner, x 1
- H.P.26 : 1924 W.8e, trimotor vers. for Belg. Sabena*
-- H.P.26: 1 x R-R Eagle IX, 2 x Siddeley Pumas, span 22.92 m
-- * 2 x Handley Page-built, 3 x Belgian SABCA-built
- H.P.26: 1 x nose R-R Eagle IX + 2 x wing Siddeley Pumas
- H.P.26: Orig. desig. W.8f,* V/1500 transport deriv.
-- * 12 pax, essent'y sim. to W.8e but w/ cabin heating
-- 3v: http://aviadejavu.ru/Images6/FT/FT1924/05/249-1.jpg
- H.P.26: W.8g, 1929 mod, twin-engined,** W.10 tail/rudder
-- ** No nose engine, 2 x wing-mounted R-R Eagle IX V-12s
-- 1929 mod was the ex-W.8f G-EBIX, 'City of Washington'

H.P.27 -- 1923* Hampstead trimotor biplane airliner, x 1
-- * Flight gives H.P.27 completion date of Oct 1925
- H.P.27: [Project] 3 x 385 hp AS Jaguars, span 24.08 m
-- aka 1923 W.9 transport-bomber to Air Min Spec 41/22
-- Civil W.9 also proposed, eclipsed by Jupiter-powered
- H.P.27: (1926) Re-eng'd w/ 420 hp Bristol Jupiter VIs
-- H.P.27 developed from W.8f/H.P.26 Hamilton (above)
-- Orig. designated Handley Page W.9a Hampstead**
-- ** Preceded by 1923 W.9 military transport project
-- http://aviadejavu.ru/Images6/FT/FT1925/11/777-2.jpg
-- 3v: http://aviadejavu.ru/Images6/FT/FT1925/10/626-1.jpg

H.P.28 -- 1924 Handcross 2-seat biplane day bomber, x 3
- H.P.28: 1 x 670 hp R-R Condor III V-12, span 18.30 m
-- aka C/7,* to AM Spec 26/23 (won by Hawker Horsley)
-- * Possibly suggesting a revived Type C (2nd vers.)
-- 3 x H.P.28 Handcross prototypes (J7498-J7500)**
-- ** J7500 later rebuilt with an all-metal airframe

H.P.29 -- [Project] 1924 D/4* biplane transport
- H.P.29: To AM Spec 40/22 'European Transport'
-- H.P.29 ultimately not submitted for Spec 40/22
-- aka Handley Page Type D (2nd use)

H.P.30 -- 1926 W.10 twin-engined biplane airliner, x 4
- H.P.30: 2 x 450 hp Napier Lion IIBs,* span 24.08 m
-- * Alt: 2 x 480 hp Rolls-Royce F.XI engines
-- Last civil airliner W.8 deriv., for Imperial Airways*
-- * Basically a 'civilianized' Hydrabad bomber
-- http://airwar.ru/image/idop/cw1/hpw8/hpw8-3.jpg

H.P.31 -- 1926 Harrow shipboard biplane torpedo-bomber
-- 2 x H.P.31 (N205 & N206), lost to Blackburn Ripon
- H.P.31 : Twin automatic slot systems (control/lift)
-- Harrow Mk.I: 1 x 470 hp Napier Lion VA, span 14.41 m
-- Harrow Mk.II: 1 x 530 hp Napier Lion IXA, changes*
-- * Rev'd nose, cut-down fuselage, dihedral both wings
-- Alt engines: 550 hp Lion XI, 480 hp R-R F.XII.A, or
-- 450 hp Bristol Jupiter VIII, 450 hp Lorraine Dietrich
-- Original desig. Handley Page Type E (second use)
- H.P.31A: [Project] 1927 Hanwell biplane torpedo-bomber
-- http://www.airwar.ru/image/idop/bww1/harrow/harrow-1.gif

H.P.32 -- 1926 Hamlet high-winged monoplane airliner
- H.P.32: 2- or 3-engines (below), span 15.85 m
- H.P.32: 1926 Hamlet, 3 x 120 hp Bristol Lucifers
- H.P.32: 1927 re-engined, 2 x 220 hp AS Lynx 7-cyl
- H.P.32: 1928 re-engined, 3 x 150 hp AS Mongoose*
-- * Hamlet flew only once with 5-cyl Mongoose
-- Original desig. Handley Page Type D (second use)
-- 3v: http://aviadejavu.ru/Images6/FT/FT1926/10/757-1.jpg

H.P.33 -- 1927 Hinaidi I/Clive I twin-engined biplanes
- H.P.33: 2 x 440 hp Bristol Jupiter VIII, span 22.86 m
- H.P.33: Hinaidi Mk.I bomber, wooden airframe, x 12*
-- * Prototype (J7745) was a converted Hyderabad **
-- ** Further 7 x H.P.24 Hyderabad conv. to H.P.33
-- 2 x 500 hp Gnome-Rhone Jupiter IX were trialled
- H.P.33: Chitral, later Clive Mk.I, mil. transport
-- http://aviadejavu.ru/Images6/FT/FT1928/06/560-1.jpg
-- http://aviadejavu.ru/Images6/MM/MM-149/1014-07-2-1.jpg
-- Clive prototype, J9126, conv. to Clive Mk.III***
-- *** Mk.III didn't enter service, became G-ABYX

H.P.34 -- 1928 Hare 2-seat biplane day bomber, x 1
- H.P.34: 1 x hp Bristol Jupiter IV, span 15.24 m
-- H.P.34 designed by Harold Boultbee to AM 23/25
- H.P.34: (As planned) 1 x Bristol Orion w/ turbo
- H.P.34: (As built) 1 x 450 hp Gnome-Rhône Jupiter
- H.P.34: (1928 mod.) 1 x 485 hp Bristol Jupiter VIII
- H.P.34: (1929 mod.) 1 x 525 hp AS Panther 14-cyl
-- Original desig. Handley Page Type H (second use)

H.P.35 -- 1928 Clive Mk.II biplane troop carrier, x ~17*
- H.P.35: 2 x 525 hp Bristol Jupiter VIIIF, span 22.86 m
- H.P.35: Clive Mk.II transport, x 2 (J9948 & J9949)
-- Metal const'n, otherwise sim. to H.P.33 Clive Mk.I
-- http://aviadejavu.ru/Images6/FT/FT1928/06/560-1.jpg
-- * Total incl. ~20 early-1930s HP.36 Hinaidi II conv.

H.P.36 -- 1929 Hinaidi II 4-seat biplane heavy bomber, x 33*
- H.P.36: Metal structured prod. vers. of H.P.33 Hinaidi I
- H.P.36: 2 x 525 hp Bristol Jupiter VIIIF, span 22.86 m
-- Original desig. Handley Page Type M (second use)
-- * 1st batch, mid-late 1929, x 16 aircraft (K1063-K1078)
-- * 2nd batch, early 1930s, x 17 aircraft (K1909-K1925)
-- 3v: http://all-aero.com/images/stories/pics4/hp-36-ld.jpg

H.P.37 -- [Project] 1927 shipboard fighter
- H.P.37: To AirMin Specification O.22/26
-- Original desig. Handley Page Type F (second use)

H.P.38 -- 1930 Heyford biplane night bomber, x 5*
- H.P.38: 2 x 550 hp R-R Kestrel IISs, span 22.90 m
- H.P.38: Prototype, 2 x 550 hp R-R Kestrel II
-- * H.P.38 desig. for preprod'n only, see H.P.50
-- To AM Spec. B.19/27, prod. Heyfords to B.23/32

H.P.39 -- 1929 Gugnunc slotted light biplane, x 1
- H.P.39: 1 x 150 hp AS Mongoose III, span 12.20 m
- H.P.39: Guggenheim Safe Aircraft Competition
-- Orig. named 'Guggenheim Competition Biplane'
-- Designed by George Volkert, reg. G-AACN/K1908
-- http://1000aircraftphotos.com/Contributions/Hancock/4358L.jpg
-- 3v: http://1000aircraftphotos.com/Contributions/Visschedijk/Additions/Handley_Page_H.P.39_Gugnunc_3-view.htm
-- 3v: http://aviadejavu.ru/Images6/FT/FT1930/03/285-1.jpg

H.P.40 -- [Project] 1929 carrier recce biplane for Japan
- H.P.40: Mitsubishi 3MR5 13-shiki replacement concept*
-- * In compet'n with Herbert Smith & Blackburn designs
-- Blackburn's T.7B-based 3MR5 chosen as Mitsubishi B2M

H.P.41 -- [Project] 1929 biplane torpedo-bomber biplane
- H.P.41: AM Spec M.5/28 joint tender with Blackburn*
- H.P.41: (no details) possibly related to H.P.40
-- * Spec elipsed by AM Spec M.1/30 leading to H.P.46

H.P.42 -- 1930 4-engined Imperial Airways airliner, x 4
- H.P.42: Imperial Airways 'Eastern' route version
- H.P.42: 4 x 555 hp Bristol Jupiter XFBM radials
-- aka (Imperial Airways) 'H.P.42E' for 'Eastern'
-- 18/24 pax (6/12 fwd, 12 aft cabin), span 39.62 m
-- G-AAGX Hannibal, 'UC Horsa, 'UD Hanno, 'UE Hadrian

H.P.43 -- 1932 biplane bomber-transport prototype, x 1
- H.P.43: [Project] 1930 trimotor for Imperial Airways
- H.P.43: 3 x 650 hp Bristol Pegasus IM3, span 34.80 m
-- H.P.43 sim. to H.P.42, to Air Min Spec C.16/28
-- Sole H.P.43 prototype (J9833) rebuilt as H.P.51

H.P.44 -- [Project] 1929 Hinaidi III biplane bomber
- H.P.44: 2 x 480 hp Siddeley Jaguars, span 22.86 m
-- H.P.44 was proposed re-engining of H.P.36 Hinaidi

H.P.45 -- 1930 4-engined Imperial Airways airliner, x 4
- H.P.45: Imperial Airways 'Western' route version
- H.P.45: 4 x 490 hp Bristol Jupiter XIF radials
-- aka (Imperial Airways) 'H.P.42W' for 'Western'
-- 28 pax (18 fwd, 20 aft cabin), span 39.62 m
-- G-AAXC Heracles, 'XD Horatius, 'XE Hengist, 'XF Helena

H.P.46 -- 1932 biplane torpedo-bomber biplane, x 1
- H.P.46: 1 x 825 hp R-R Buzzard, span 15.24 m*
-- * Single-bay wings, extreme gull on lower panels
-- H.P.46 S1642 flew 25 Oct 1932, M.1/30 cancelled

H.P.47 -- Two-seat General-Purpose low-wing monoplane, x 1
- H.P.47: 1 x 660 hp Bristol Pegasus IIIM3, span 17.68 m
-- Pod-and-boom fuselage, designed to AM Spec. G4/31
-- 3v: http://www.airwar.ru/image/idop/other1/hp47/hp47-1.gif
-- https://www.secretprojects.co.uk/forum/index.php/topic,7776.msg67855.html

H.P.48 -- Designation reserved but not used

H.P.49 -- Designation reserved but not used

H.P.50 -- 1933 Heyford biplane night bomber, x 124
- H.P.38: 2 x Rolls-Royce Kestrels, span 22.90 m
-- Heyford Mk.I : 575 hp Kestrel III, x 15, K3489-K3902*
-- * K3902 completed as Heyford Mk.II prototype
-- Heyford Mk.IA: 4-blade props, x 23, K4021-K4043
-- Heyford Mk.II: 640 hp Kestrel IV, x 16, K4863-K4878
-- Heyford Mk.III: superch'd 695 hp Kestrel VI, x 70**
-- ** Built in two batches, K5180-K5199 & K6857-K6906
-- Production Heyfords to AirMin Specification B.23/32
-- 3v: http://airwar.ru/image/idop/bww2/heyford/heyford-1.gif

H.P.51 -- 1935 monoplane bomber-transport, x 1*
-- H.P.43 biplane conv. into high-wing monoplane
- H.P.51: 2 x 700 hp AS Tiger VI,** span 27.43 m
-- ** Later 750 hp Bristol Pegasus 3M3, mod. tail
-- * J9833, to AM Spec C.26/31 (Bristol Bombay)

H.P.52 -- 1936 Hampden I twin-engined day medium bomber
- H.P.52 : 2 x Bristol Pegasus radials, span 21.09 m
Designed by Gustav Lachmann to AM Specification B9/32
- H.P.52: Prototype, K4240, 2 x Bristol Pegasus P.E.5S(a)
- H.P.52: Hampden I, 2 x 980 hp Bristol Pegasus XVIIIs
- H.P.52: [Project] Nov 1934 torpedo-bomber proposal*
-- * To AM Spec M.15/35, wider fuselage with turret
-- AM Spec M.15/35 revised to 4-seat AM Spec M.10/36
- H.P.52: Hampden TB Mk.I, 1942 Mk.I conv'ns, x 144

H.P.53 -- 1937 coastal patrol bomber for Sweden
- H.P.53 (1): Swedish H.P.52 Hampden,* span 27.43 m
-- * Sometimes mis-listed as twin-float seaplane
- H.P.53 (1): 2 x 1,010 hp Bristol Pegasus XXIVs
-- 4th prod'n Hampden Mk.I (L4036) re-engined**
-- Swedish desig. P 5 (Provflygplan), F11-75/I-90
- H.P.53: [Project] Swedish license production***
-- *** Armament: Bofors 20 mm, Colt 8 mm machine guns
-- https://www.secretprojects.co.uk/forum/index.php/topic,27932.msg291159.html#msg291159
- H.P.53 (2): 1938 Hereford medium day bomber
-- H.P.53 desig. re-application, SE order cancelled
-- To AM Spec B.44/36, prototype Hampden (L7271)
- H.P.53: 2 x Napier Dagger I.SMs, span 21.08 m
-- http://airwar.ru/image/idop/bww2/hereford/hereford-2.jpg
- H.P.53: Prod'n, 2 x 1,000 hp Napier Dagger VIIIs
-- 3v: http://airwar.ru/image/idop/bww2/hereford/hereford-1.gif
-- 152 x Herefords built by Short and Harland, Belfast

H.P.54 -- 1936 Harrow bomber-transport, x 100*
- H.P.54: 2 x Bristol Pegasus, span 26.96 m
- H.P.54: Harrow I , 2 x 830 hp Pegasus X, x 19
- H.P.54: Harrow II, 2 x 825 hp Pegasus XX, x 81
- H.P.54: 'Sparrow', mod. w/ nose turret removed
-- http://airwar.ru/image/idop/bww2/harrow/harrow-6.jpg
-- Orig. C.26/31, B.29/35 prep. around Harrow
-- * 100 ordered by FAA but no prod'n capacity
-- 3v: http://airwar.ru/image/idop/bww2/harrow/harrow-1.gif

H.P.55 -- [Project] 1936 twin-engined heavy bomber
- H.P.55: 2 x Bristol Hercules H.E.ISM, span 28.95 m
-- Alt. engines: 2 x R-R Merlins or 2 x R-R Vultures
- H.P.55: 1 x prototype ordered, cancelled June 1937
-- Handley Page preferred to concentrate on H.P.56
- H.P.55: One of three designs to AM Spec B.1/35*
-- * Others: Vickers 284 Warwick (winner) and AW.39
-- * B.1/35 eclipsed B.3/34,** AW Whitley replace't
-- ** B.3/34 to replace RAF Handley Page Heyfords

H.P.56 -- [Project] 1937 twin-engined heavy bomber
- H.P.56: 2 x 1,700 hp R-R Vultures, span 27.00 m
- H.P.56: To AirMin Spec P.13/36, eclipsed H.P.55
-- Comp. w/ Boulton Paul P.91 and Avro Manchester
-- 3v: http://aviadejavu.ru/Images6/AI/AI55-4/112-1.jpg

H.P.57 -- 1939 Halifax Mk.I 4-engined heavy bomber
- H.P.57: 4 x Rolls-Royce Merlin V-12s, span 30.21 m
- H.P.57: Halifax prototype to Spec B.32/37 (OR.44)
- H.P.57: Second prototype, Halifax Mk.I
-- Halifax B.I Series I: 4 x 1,280 hp R-R Merlin X
-- Halifax B.I Series II : Higher gross weight
-- Halifax B.I Series III: 1,390 hp Merlin XX*
-- * Engines as in the B.Mk.II Series I Halifax
-- Variants: http://aviadejavu.ru/Images6/MM/MM-64/0214-03-2-1.jpg

H.P.58 -- [Project] 1939 4-engined heavy bomber
- H.P.58: 4 x Rolls-Royce Merlin V-12s, span 30.00 m
- H.P.58: 4 x 20 mm cannon-armament, no tail turret*
-- * Cancelled due to problems with new armament
-- H.P.58 Halifax Mk II, name transf. to H.P.59

H.P.59 -- 1941 Halifax II 4-engined heavy bomber
- H.P.59 : Improved, increased T/O weight, etc.
- H.P.59A: [Project] 1940 half-scale B.1/39
- H.P.59: Halifax B.II Series I, IA, and II

H.P.60 -- [Project] 1940 4-engined heavy bomber
- H.P.60: Halifax IV bomber, refined airframe*
- H.P.60: R-R Griffons or Hercules, span 34.74 m
-- * Long-tailled nacelles, fully-encl. wheels
- H.P.60A: 4 x 1,280 hp R-R Merlin 65s

H.P.61 -- 1941-1943 Halifax bomber developments
- H.P.61 : 4 x Bristol Hercules, span 31.75 m*
-- Hercules-powered vers. of B.Mk.II Series IA
- H.P.61 : 1941 Halifax B.Mk.III heavy bomber
-- B.III: 4 x 1,615 hp Bristol Hercules XVI
-- A.III: B.III glider tug/transport convers.
-- C.III: B.III military transport conversion
- H.P.61 : 1943 Halifax B.Mk.VI heavy bomber
-- B.VI : 4 x 1,800 hp Bristol Hercules 100s
- H.P.61 : 1943 Halifax B.Mk.VII heavy bomber
-- B.VII: 4 x 1,615 hp Bristol Hercules XVIA.VII
-- A.VII: B.VII glider tug/transport convers.
-- C.III: B.VII military transport conversion

H.P.62 -- [Project] 1941 Hampden II medium bomber
- H.P.62: 2 x 1,000 hp Wright Cyclone GR-1820-G105
-- Radlett-built L4032 re-engined with Cyclones
-- Prototype H.P.62, X3115, completed by E-E
-- EE-built X3115 completed as prototype H.P.62
-- NB: Some sources also list K4032, a Heyford I!

H.P.63 -- 1943 Halifax V 4-engined heavy bomber
- H.P.63: 4 x 1,220 hp R-R Merlin XX, span 30.21 m
-- Halifax B.V: B.II with Dowty u/c, not Messier
- H.P.63: Halifax B.V Series I, Series I (Special)
-- Halifax A.V: B.V glider tug/transport convers.
-- Halifax GR.V: Coastal Command B.V variant

H.P.64 -- [Project] 1943-1944 Halifax pax transport
- H.P.64: 4 x Bristol Hercules Mk 100s, span 31.69 m
- H.P.64: Low-wing, 2.89 m circular section fuselage
-- aka Transport C, AM Spec. C.15/43 est. for H.P.64
-- H.P.64 deriv. from 1942 mid-wing proposal to RAF*
-- * Offered w/ either Merlin XXs or Hercules VIs
-- H.P.64 intended for BOAC/QEA UK-Australia route
-- https://www.secretprojects.co.uk/forum/index.php/topic,18466.msg177580.html#msg177580

H.P.65 -- [Project] 1943 Halifax IV 4-engined bomber
- H.P.65: 4 x turbo-supercharged Bristol Hercules 38s
- H.P.65: Single-spar laminar-flow wing, span 34.44 m*
-- * New wing mated to standard Halifax III fuselage
-- H.P.65: aka 'Super-Halifax', eclipsed by H.P.66
-- https://www.secretprojects.co.uk/forum/index.php/topic,9998.msg93158.html

H.P.66 -- [Project] 1944 Hastings B.1 4-engined bomber
- H.P.66: 4 x 1,800 hp Bristol Hercules 100, span 34.44 m
- H.P.66: Revised H.P.65 with non laminar-flow wings*
-- * Halifax outer panels wing 16.76 m centre section
- H.P.66: Hastings B.I to Air Min Specification B.27/43
-- * Halifax outer panels wing 16.76 m centre section
- H.P.66: Hastings B.II with turbo Hercules HE-15MTs**
-- ** Alt: 4 x Merlin 65s in 'idealised' cowlings***
-- *** RAE-devised circular-section cowlings (as on Lincoln)
-- https://www.secretprojects.co.uk/forum/index.php/topic,9998.msg93158.html

H.P.67 -- 1944 Hastings civil/military transport
- H.P.67: 4 x Bristol Hercules radials, span 34.44 m
- H.P.67: H.P.64 fuselage w/ H.P.66 B.1 wing, to C.3/44
-- Single vert. tail, H.P.67 emerged as Hastings/Hermes
-- https://www.secretprojects.co.uk/forum/index.php/topic,21381.msg219341.html#msg219341
- H.P.67: 2nd prototype, TE583, conv. to jet testbed*
-- 2 x AS Sapphire turbojets repl. outboard Hercules
-- https://abpic.co.uk/pictures/full_size_0179/1269823-large.jpg
- H.P.67: 1946 Hastings C.1, Hercules 101, x 100
-- Conv's.: Hastings Met.1 x 7, Hastings T.5 x 8**
-- ** T.5 : H2S Mk.9 radar for 'V' bomber training
-- https://abpic.co.uk/pictures/full_size_091/1137267-large.jpg
- H.P.67: Hastings Met.1 (new-build a/c) x 6
- H.P.67: Hastings C.1A (C.1s rebuilt to C.2 stds)
- H.P.67: 1949 Hastings C.2, Hercules 106, x 41
--Hastings C.2, incr. fuel/tail area, to C.19/49
-- https://www.secretprojects.co.uk/forum/index.php/topic,21381.msg219341.html#msg219341
-- Also see H.P.94 (VIP C.4) and H.P.95 (RNZAF C.3)

H.P.68 -- 1945 Hermes I civil transport a/c, x 1
- H.P.68: 4 x 1,650 hp Hercules 101, span 34.45 m
- H.P.68: 50 pax in pressure cabin, tailwheel u/c
-- H.P.68 prototype crashed on its maiden flight
- H.P.68: Two variants studied, Hermes IA and IB
-- IA: pax/freighter, military-style Hercules 101
-- IB: As IA except Hercules 733 w/ rear exhaust

H.P.69 - [Project] 1945 Hastings B.II heavy bomber
- H.P.69: 4 x Bristol Hercules HE-15MT, span 34.44 m
-- Hastings B.II, turbo-supercharged H.P.66 deriv.
- H.P.69: To AM Spec B.27/43 (as was H.P.66)

H.P.70 -- 1945 Halifax C.VIII/Halton transport a/c
- H.P.70 : 4 x Bristol Hercules, span 31.75 m
- H.P.70: Halifax C.VIII, RAF cargo/pax transport*
-- * Originally dubbed 'Transport B' internally**
-- ** Transport A was Halifax conv, 'C was H.P.64
-- https://www.baaa-acro.com/sites/default/files/import/uploads/1948/02/PP285.jpg
- H.P.70 - 1945 Halton I, BOAC Halifax airliner conv.
-- https://www.flickr.com/photos/skylarkair/14358297288
- H.P.70 - Halton II, VIP a/c (later became G-AGZP)
-- https://www.flickr.com/photos/dwhitworth/5538870531

H.P.71 -- 1945 Halifax A.IX Airborne transport a/c
- H.P.70 : 4 x Bristol Hercules XVI, span 31.75 m
-- Dedicated paratroop transport/glider tug, x 145
-- https://www.flightglobal.com/FlightPDFArchive/1945/1945%20-%202257.PDF

H.P.72 -- [Project] 1946 4-engined strategic transport
- H.P.72: 4 x 2000 hp Bristol Centaurus, span 41.14 m*
- * Reversed gull wing, raised cockpit, double-decker
- H.P.72: To Air Ministry Specification C15/45
- H.P.72: Nose loading doors, BP Type D tail turret
-- https://www.secretprojects.co.uk/forum/index.php/topic,15268.msg239649.html

H.P.72A - [Project] 1946 4-engined jet bomber
- H.P.72A: Swept wings, tip rudders, small tailplane*
-- * All-moving, H.P.72A project eclipsed H.P.75A
-- H.P.72A concept led to 1947 H.P.80 Victor

H.P.73 -- [Project] 1946 4-engined strategic transport
- H.P.73: Hastings II in competition w/ H.P.72 design
- H.P.73: Stretched, rear loading ramp, 80,000 lbs AUW
-- https://www.secretprojects.co.uk/forum/index.php/topic,15268.msg239649.html

H.P.73 -- [Project] 1946 stretched Hastings C.1*
- H.P.73: Rear loading ramp, 80,000 lbs loaded
-- H.P.73 based upon Hastings III airframe
-- https://www.secretprojects.co.uk/forum/index.php/topic,15268.msg239649.html

H.P.74 -- 1946 Hermes II civilian transport a/c, x 1
- H.P.74: 4 x 1,675 hp Hercules 101, span 31.75 m*
- H.P.74: Hermes II, G-AGUB, H.P.68 Hermes I devel.
-- Hermes II/Hermes 2 employed as research aircraft
-- * H.P.74 also had 4.57 m longer forward fuselage
- H.P.74: [Project] Hermes III, Theseus turboprops
-- Theseus-powered Hermes III concept redesig. HP.79
-- https://www.flightglobal.com/FlightPDFArchive/1946/1946%20-%201782.PDF

H.P.75 -- 1945 proof-of-concept Tailless Research Aircraft
- H.P.75 : 2 x 130 hp DH Gypsy Major IIs, span 12.14 m
- H.P.75 : PoC airframe for tailless pusher bomber concept
-- aka 'Manx', design work first commenced in 1937
-- https://www.secretprojects.co.uk/forum/index.php/topic,21381.msg316250.html#msg316250

H.P.75A - [Project] 1945 unarmed high-speed jet bomber
- H.P.75A: 4 x (??) R-R Avon turbojets, span 37.18 m
- H.P.75A: Tailled swept-wing a/c (unrelated to 'Manx')
-- H.P.75A had cruciform tail (short vert.)and winglets
-- H.P.75A concept led to/eclipsed by 1947 H.P.72A project

H.P.76 - [Project] 1945 twin-turboprop 34 pax civil airliner
- H.P.76: To Brabazon 2B, 2 x AS Mamba, loaded 34,000 lbs
-- Tricycle u/c, mock up of H.P.76 begun in 1945 (completed?)

H.P.77 -- [Project] 1945 civil airliner to Brabazon 2B
- H.P.77: As H.P.77 but with 2 x Bristol Theseus engines

H.P.78 - [Project] 1946 4 x turboprop 32 pax civil airliner
- H.P.78: 4 x (?) shp AS Mamba turboprops, span 30.48 m
- H.P.78: To Brabazon 2B, 4-engined H.P.76 derivative

H.P.79 -- [Project] 1947 Hermes III civil transport a/c*
- H.P.79: 4 x 2,400 hp Bristol Theseus B.Th.II turboprops
-- * Orig. Theseus-engined HP.74, redesig. in mid-1946**
-- ** 25 June 1946, seating also reduced from 64 to 52 pax
-- ** Fuel capacity increased by use of outer-wing bag tanks
-- https://www.flightglobal.com/pdfarchive/view/1948/1948%20-%201623.html

H.P.80 - 1947 Victor 4-engined jet bomber to B.35/46
- H.P.80: Cresent wings, span 33.52 m (B.1)/36.48 m
- H.P.80: Prototype WB771, AS Sapphire 7 Mark 200s*
-- * 1st prototype H.P.80, WN771 1st flew 24 Dec 1952
- H.P.80: 1953 prototype WB775, reinforced tailplane
-- Victor B.1 : AS Sapphire 7 202/207 turbojets, x 50
-- Victor B.1 : [Project] 1959 re-eng. w/ R-R Avon RA.28s
-- Victor B.1A: 1960 impr'd ECM equipment mod., x 24
-- Victor B(K).1A: 1964 tanker trials convers., x 6
-- Victor B.1A(K2P): 1968 redesig. of Victor B(K).1As
-- Victor BK.1 : 1966 tanker convers. of B.1s , x 11
-- Victor BK.1A: 1966 tanker convers. of B.1As, x 14
-- Victor B.2 : [Project] 4 x AS Sapphire 9 turbojets
-- Victor B.2 : [Project] R-R Conway RCo.8 turbofans
-- Victor B.2 : Longer-span wings, R-R Conway turbofans
-- Victor B.2 : 17,250 lbf R-R RCo.11 Conway 103, x 34
-- Victor B.2R: 20,600 lbf R-R RCo.17 Conway 201, x 21
-- NB: All Victor B.2Rs were Victor B.2 conversions
-- Victor B(SR).2: Strategic recce conv. of B.2s, x 9
-- Victor K.2 : 1972 B.2/B.2(SR) mod. to tanker, x 24
-- Victor K.2 had clipped wing tips, deleted bomb gear**
-- ** Describing BAe mods, HP proposed wing tip fuel pods
-- https://www.secretprojects.co.uk/forum/index.php/topic,30318.0.html

H.P.81 -- 1947 Hermes IV civil transport a/c for BOAC
- H.P.81: Hermes IV with twin-wheeled tricycle u/c
-- Hermes IV : 4 x 2,100 hp Bristol Hercules 763, x 25
-- Hermes IVA: Hermes IV mod, 100-octane Hercules 773*
-- * Most returned to IV as more 115-octane was avail.
-- https://www.flightglobal.com/pdfarchive/view/1948/1948%20-%201623.html
-- 3v: http://1000aircraftphotos.com/Contributions/Visschedijk/Additions/Handley%20Page%20H.P.81%20Hermes%204_3-view.htm

H.P.82 -- 1949 Hermes V civil transport, x 2*
- H.P.82: 4 x 2,820 shp Bristol Theseus, span 31.75 m
-- H.P.82 to Air Ministry Specification 37/46
-- * H.P.82/1 G-ALEU** and H.P.82/2 (ALEV)
- H.P.82A: Hermes VA piston-engined airliner,
- H.P.82B: Hermes VB turboprop airliner conv.
-- ** H.P.82/1 conv. to 'Proteus-Hermes'***
-- *** 1951, to get around end of Theseus
- 4 x 3,350 shp Bristol Proteus 3, span 35.84 m
-- Greater span dictated by propeller diameter

H.P.83 -- [Project] 1947 Hermes civil a/c to MRE-2/47
- H.P.83: Hermes devel. w/ 4 x Bristol Hercules 663s

H.P.84 -- [Project] 1947 civil transport to MRE-2/47
-- MRE = Brabazon Type III 'Medium Range Empire'

H.P.85 -- [Project] 1947 Hermes civil a/c to MRE-2/47
- H.P.85: 2 x coupled Bristol Proteus turboprops
-- H.P.85 to have a single-spar wing (à la H.P.65?)

H.P.86 -- [Project] 1947 Hermes civil a/c (MRE-2/47)
- H.P.86: 4 x Bristol Hercules 663s, single-spar wing

H.P.87 -- 1/3 scale radio-controlled H.P.80 glider, x 1
- H.P.87: Crashed on its 1st flight, project abandoned
-- Remote-controlled H.P.87 replaced by manned H.P.88

H.P.88 -- 1948 Supermarine Attacker-based research a/c
- H.P.88: 1 x 5,000 lbf R-R Nene 102, span 12.20 m
- H.P.88: Devel. with General Aircraft to Spec. E6/48
-- Fitted with 4/9 scale H.P.80 Victor crescent wing*
-- * Also fitted with scaled H.P.80 Victor 'T'-tail
-- VX330 built by Blackburn (YB2), flew 21 June 1951

H.P.89 -- [Project] 1948 Hastings VI military transport
- H.P.89: Hastings VI transport variant, abandoned
- H.P.89: 4-wheel bogie u/c, nose & rear loading doors

H.P.90 -- 1948 Hermes IA civilian pax/freighter a/c, x 1
- H.P.90: Civil Hastings C.1, 4 x Bristol Hercules 101
-- Hermes IA: TG503,* development quickly abandoned
-- * 5th prod'n a/c, portable vehicle loading ramps
-- Hermes IB: As IA except rear exhaust Hercules 733

H.P.91 -- [Project] 1948 Hermes VI, lightened Hermes IA
- H.P.91: 4 x Bristol Hercules 763 (or later deriv's)*
- H.P.91: To have lighter-weight, single-spar wings
-- Airframe changes to reduce all-up weight by 2,000 lbs
-- Larger chord ailerons and Frise double-slotted flaps
-- * PD Stemp says H.P.91 was to use 4 x Hercules 783s

H.P.92 -- [Project] 1948 Hermes VII civil freight a/c
- H.P.92 : As H.P.91 but w/ 4 x Rolls-Royce Merlins

H.P.93 -- 1948 Dufaylite test wing for Miles Messenger
- H.P.93: Dufaylite (paper honeycomb) core wing constr.
-- Anticipated Miles M.76 glider with Dufaylite wing*
-- * With a nasty-sounding phenolic/asbestos cladding

H.P.94 -- 1948 Hastings C.4 VIP transport aircraft, x 4*
- HP.94: Hastings C.4, 4 x Bristol Hercules 130 radials
-- * C.4 WD500 + 3 x C.2 conv'n (WJ324, WJ325, & WJ326)
-- Accomm. generally 12 pax (4 x VIPs plus their staff)
- H.P.94: Hastings C.4 to AirMin Specification C.115P
-- Sometimes referred to as Hastings C.(VIP)Mk.4

H.P.95 -- 1950* Hastings C.3 transport for New Zealand
- HP.95: Hastings C.3 tailored to RNZAF requirements
-- Sim. to Hastings C.2, Bristol Hercules 737s, x 4
-- * NZ5801 flew Nov 1951, to Whenuapai 30 Jan 1952

H.P.96 -- [Project] 1951 H.P.80-based military transport
- H.P.96: Circular-section fuselage, low-mounted wings
-- H.P.96 to be capable of transporting 85 troops
-- http://www.aviationmodels-online.com/Featured_model9/HP96.jpg

H.P.97 -- [Project] 1951 H.P.80 Victor-based airliner
- H.P.97 : 4 x R-R Conway jet engines, span 38.10 m
- H.P.97 : 96-seater w/ option for 42 on lower deck
-- H.P.97 proposed to BOAC as 'Pacific' in 1952
-- H.P.97 design models appears identical to HP.96
- H.P.97A: Military transport, redesig. as H.P.101

H.P.98 -- [Project] 1951 H.P.80 Victor target-marker
- H.P.98: Dedicated target-marker for Victor fleet*
- H.P.98: 4 x R-R Conway 200-series, remote tail guns
-- * H.P.98 rejected by AM in favour of Valiant B.2

H.P.99 -- [Project] 1952 'Daisy Cutter' low-level bomber
- H.P.99: 4 x Rolls-Royce Avon turbojets,* span 21.48 m
- H.P.99: Mid-mounted, short-span crescent wings
-- * Engines mounted in pairs on underwing pylons
- H.P.99: Designed to Air Ministry Specification B.126T

H.P.100 - [Project] 1954 long-range, high-speed recce-bomber
- H.P.100: 12 x lightweight R-R turbojets, span 18.10 m
- H.P.100: Canard delta, droop nose, mainly titanium constr.
-- To OR.330, cruising speed Mach 2+, 5,000 mile range

H.P.101 - [Project] 1952 H.P.80 Victor-based transport a/c
- H.P.101: Proposed military version of HP.97 airliner

H.P.102 - [Project] 1955 boundary layer control airliner
- H.P.102: 4 main + four aux. turbojets, Span 45.72 m
- H.P.102: Laminar-flow tapered but unswept wings/tail
-- 120 pax H.P.102 superceded by trans-Atlantic H.P.108

H.P.103 - 1955 BLC conversion of Hunting Jet Provost
- H.P.103: 1 x AS Viper ASV5 turbojet, span 10.71 m

H.P.104 - [Project] 195? Phase 3 H.P.80 Victor bomber
- H.P.104: H.P.80 develop. w/ more powerful engines*
-- * 4 x Bristol Olympus or 14,000 lbf AS Sapphire
- Later 6 x Sapphire turbojets proposed for H.P.104
-- Supersonic Phase 4** doesn't seem to have an H.P. number
-- ** Combined B.2 wings/tail with a new area-rule fuselage
-- https://www.secretprojects.co.uk/forum/index.php/topic,6066.msg208546.html#msg208546

H.P.105 - [Project] 1955 BLC military transport to C.132D
H.P.105: Similar to civil H.P.102 airliner (above)

H.P.106 - [Project] 1955-1957 design studies of missiles

H.P.107 - [Project] 1955 supersonic bomber, to OR.330
- H.P.107: 5 x Bristol Olympus turbojets, sim. to H.P.100*
-- * But a less ambitious project than H.P.100

H.P.108 - [Project] 1956 4-engined jet airliner
- H.P.108: 4 x 10,000 lbf R-R Avon RA.28 turbojets*
-- * Engines clustered in two trailing-edge pods
- H.P.108: B707 rival; low wings, cruciform tail
-- https://www.secretprojects.co.uk/forum/index.php/topic,15268.msg273985.html#msg273985

H.P.109 - [Project] 1956-57 supersonic transport a/c
- H.P.109: 6 x turbojets in central pods, span 32.82 m
- H.P.109: Olgive wings, 4 + 120 pax, max. Mach 2.2
-- https://www.secretprojects.co.uk/forum/index.php/topic,2435.msg91554.html#msg91554

H.P.110 - [Project] 1958 supersonic transport, Mach 1.2
- H.P.110: Sim. to H.P.109, intended for medium range
-- H.P.110 proposed with and w/o laminar-flow control

H.P.111 - [Project] 1958* strategic jet transport/freighter
- H.P.111 : Based on H.P.80 Victor wings/tail/powerplants
- H.P.111 : 4 x 17,250 lbf R-R Conway 42s,** span 39.62 m
-- H.P.111 contract denied to 'unmerged' Handley Page
-- * NB: 1st transp. variant revealed 1952 SBAC Display
- H.P.111C: 1958 civilian transport vers. of the H.P.111
-- aka 'Civil Victor', aka 'Tebble One', various models
-- Opt'l all-pax or combi (pax upper deck, cargo lower)
-- ** Opt'l on H.P.111C, 4 x Pratt and Whitney JT3-D3s
-- https://www.secretprojects.co.uk/forum/index.php/topic,10388.msg97646.html

H.P.112 - [Project] 1958 'Flying Jeep' to Spec. 92/58
- H.P.112: (??) x R-R RB.108 liftjet,* span 8.23 m
- H.P.112: Pod-and-twin-booms 4-wheeled vehicle
-- * "Multiple" engines fed by a roof intake**
-- ** Intake to port side, pilot to starboard

H.P.113 - [Project] 195? 'laminarised' 12 seat commuter
- H.P.113: 2 x Bristol Orpheus turbojets,* span 21.71 m
-- * Rear-mounted, derated to 5,250 lbf, provide suction
-- Laminar flow/blown controls by suction compressors
-- https://www.secretprojects.co.uk/forum/index.php/topic,15268.msg251155.html

H.P.114 - [Project] 1958 Phase 6 H.P.80 Victor bomber
- H.P.114: 2 or 4 x US GAM-87 (AGM-48) Skybolt ALBMs
-- H.P.114 for standing airborne patrols w/ incr. fuel
-- https://www.mediastorehouse.com/image.php?large=9895915

H.P.115 - 1961 low-speed handling delta wing testbed, x 1
- H.P.115: 1 x 1,900 lbf BS Viper BSV.9, span 15.33 m
-- 'Slender Delta' research aircraft to AM Spec ER.197D
-- Low-aspect ratio delta wing tests for potential SST

H.P.116 - [Project] 1959 tactical freighter studies

H.P.117 - [Project] 1960 200-300 pax* flying-wing airliner
- H.P.117: 6 x R-R RB.163 Spey turbofans,** span 38.10 m
-- * 300 pax and 200 pax variants varied in exact layout
-- ** Engines to be grouped in hindmost centre section
-- ** NB: 3v shows 'RB963', ref. to Allison-built AR 963
- H.P.117: 'All-Wing' laminar flow, w/ endplate fins & BLC
-- H.P.117 also proposed to RAF as Skybolt carrier
-- https://www.secretprojects.co.uk/forum/index.php/topic,15268.msg1066.html#msg1066
-- https://www.secretprojects.co.uk/forum/index.php/topic,3428.html

H.P.118 - [Project] 1960 VTOL 'Jumping Jeep' to Spec 92/58
- H.P.118: 1 x 4,400 lbf R-R RB.162 single-shaft lift-jet
-- H.P.118 eclipsed H.P.112, in turn eclipsed by H.P.120
-- https://www.secretprojects.co.uk/forum/index.php/topic,1982.15.html

H.P.119 - [Project] 1961 3/10 scale model for H.P.117
- H.P.119: 3 x B.S. Viper 20 turbojets, span 13.62 m
- H.P.119: High-mounted flying wing with endplate fins
-- https://www.secretprojects.co.uk/forum/index.php/topic,11786.msg113726.html

H.P.120 - [Project] 1961 2-man convertible Jumping Jeep
- H.P.120: Various R-R lift-jet combos,* span 4.87 m
- H.P.120: Roadable jeep w/ foldable wings and tails**
-- * Initially 4,400 lbf Rolls-Royce RB.162 lift-jet
-- * Road propulsion provided by 100 hp Coventry Climax
-- * Later, 4 x 3,300 lbf R-R RB.172 lift-jet engines
-- * Finally, RB.162/RB.175 lift + 1 x RB.172 flight jet
-- ** Short projecting twin-booms with twin 'T' tails

H.P.121 - Designation not applied*
-- * To avoid confusion with de Havilland DH.121

H.P.122 - [Project] 1961 VTOL turboprop transport
- H.P.122: 4 x Rolls-Royce Tyne turboprops, span (??)
- H.P.122: To AirMin OR.351 (Operational Requirement)

H.P.123 - [Project] 1961 H.P.80-based BLC transport
- H.P.123: HP.111-based military tactical transport*
-- * Clamshell rear loading doors, blown flaps
- H.P.123: To AirMin OR.351 (Operational Requirement)

H.P.124 - [Project] 1962 rear-ramped Military Herald
- H.P.124 : 2 x 2,750 shp R-R Dart RDa.10 Mk640/10
- H.P.124 : Basic military cargo configuration
- H.P.124 : Underwing jet 'Altitude-Boost Pods'*
-- * 2 x Bristol-Siddeley Viper V.20 turbojets
-- https://www.secretprojects.co.uk/forum/index.php/topic,3108.msg43570.html#msg43570
-- https://www.secretprojects.co.uk/forum/index.php/topic,4685.msg36989.html

H.P.125 - [Project] 1962 tactical VTOL H.P.124 variant
- H.P.125: 18 X R-R RB162 lift-jets in underwing pods
- H.P.125: To NMBR-4 (NATO Military Basic Requirement)

H.P.126 - [Project] 1962 All-Wing Aerobus, 100 pax airliner
HP.126: 4 x unspecified bypass jets,* span 22.09 m
-- * 29,000 lbf (total), clustered in centre section
-- https://www.secretprojects.co.uk/forum/index.php/topic,10232.msg95935.html
-- 3v: https://www.secretprojects.co.uk/forum/index.php/topic,10232.msg95988.html#msg95988

H.P.127 - [Project] 1962 Jet Herald feederliner development
- H.P.127: 2 x 8,850 lbf RR RB.183/1 Spey Juniors, span 24.38 m
-- Podded engines, shortened span, 70 pax in lengthened fuselage
-- https://www.secretprojects.co.uk/forum/index.php/topic,3108.msg25099.html

H.P.128 - [Project] 1962 short-range supersonic transport
- H.P.128: 3 x 15,000 lbf R-R RB.163 Speys, span 20.57 m
- H.P.128: 45° swept wings, jet engines group in tail
-- H.P.128 range was to be 1,000 miles, 2 + 125 pax
-- https://www.secretprojects.co.uk/forum/index.php/topic,15335.msg43572.html

H.P.128 - [Project] 1962 short-range supersonic transport
- H.P.128: 3 x 15,000 lbf R-R turbofans,* span 20.57 m
- H.P.128: 45° swept wings,** jet engines group in tail
-- * Proposed enlarged (x 1.45) Rolls-Royce RB.163 Speys
-- ** 'Scimitar' wings, area-ruled fuselage, var. configs
-- https://www.secretprojects.co.uk/forum/index.php/topic,15335.msg43572.html

H.P.129 - [Project] 1962 'Mini Herald' 30 pax feederliner
- HP.129: 2 x R-R RB.183 Spey Junior turbofans, span 17.45 m
- HP.129: 'Mini Herald' as in a reduced-scale H.P.128

H.P.130 - [Project] 1963 boundary Layer control H.S.125
- H.P.130: H.S.125 BLC research conver., 2 x BS Vipers
-- https://www.secretprojects.co.uk/forum/index.php/topic,5308.msg239647.html

H.P.131 - [Project] 1964 improved HP.124 ramped Herald transport
- H.P.131: 2 x 3,245 shp R-R Dart R.Da.12 turboprops, span
-- 1965, offered to Belgium in 1965 along with HP.132 and HP.133

H.P.132 - [Project] 1965 STOL variant of H.P.131 (above)
- H.P.132: 2 x 3,245 shp R-R Dart R.Da.12 + 2 x GE CF700*
-- * Wingtip-mounted 4,000 lbf turbofan booster engines

H.P.133 - [Project] 1965 STOL variant of H.P.131 (above)
- H.P.133: 2 x 3,245 shp R-R Dart R.Da.12 + 2 x GE CF700*
-- * Turbofan booster engines in retractable nacelles
- HP.133: Offered to Belgian Air Force in 1965, rejected

H.P.134 - [Project] 1965 Ogee Aerobus high-speed airliner
- H.P.134: 154 pax, 3 engines clustered in tail, span (??)
-- More convential fuselage, low-aspect ratio ogive delta
-- https://www.secretprojects.co.uk/forum/index.php/topic,10232.msg95988.html#msg95988

H.P.135 - 1965 high-winged laminar-flow military transport
- H.P.135: 4 x unspecified-type turbojets,* span 62.48 m
-- * Semi-annular rear fuselage intake, T-tail, 100 pax
-- https://www.secretprojects.co.uk/forum/index.php/topic,634.msg22095.html#msg22095

H.P.136 - Designation not applied*
-- * To avoid confusion with de Havilland DH.136

H.P.137 - 1965 Jetstream twin-turboprop light transport a/c
- H.P.137: 2 x R-R/Turbomeca Astazous, span 15.85 m
-- H.P.137 intended as 12-seat DH Dove/Heron successor
-- Jetstream Mk 1, 840 shp Astazou XIV, x 36 at Radlett
-- Jetstream Mk 2, 940 shp Astazou XVI, none completed*
-- * Later built as Jetstream 200 by Scottish Aviation
-- Jetstream Mk 3, Garrett AiResearch TPE331, x 1 **
-- ** 1968 prototype HP137 Jetstream 3, c/n 258, G-AWBR
-- http://www.airport-data.com/aircraft/photo/000910254L.html
-- Jetstream Mk 3M: TPE331 variant for USAF as C-10A***
-- *** 11 x Mk 3M ordered, option on 300 more, cancelled

______________________________

H.P.R. - Handley Page Reading Design Office (1948-1960)

After Miles collapsed, HP took over its affairs as Handley Page (Reading) Ltd. HP Reading was formed on 05 May 1948 to handle production of the Miles M.60. For the next decade, designs originating from the Handley Page Reading Design Office received H.P.R. designations. [1] In some cases, lapsed H.P.R. designations seem to have been re-applied to completely unrelated projects - eg: H.P.R.1, H.P.R.4, and H.P.R.5.

Handley Page H.P.R. Aircraft Designations

H.P.R.1 - 1948 Miles M.60 transport, 2 + 18-22 pax
- H.P.R.1: 4 x DH Gipsy Queen 6-cyl., span 19.81 m
-- Marathon I : 340 hp DH Gipsy Queen 70-3s, x 10 *
-- * Most mod. as Marathon T.IIs trainers for RAF
-- Marathon IA: 330 hp DH Gipsy Queen 70-4s, x 2

H.P.R.1 - [Project] 1950 Basic Trainer derivative*
- H.P.R.1: 1 x 295 DH Gipsy Queen 51, span 10.66 m
-- * According to PD Stemp, Kites, Birds and Stuff

H.P.R.2 - 1950 Basic Trainer, to T.16/48, 2 x built *
- H.P.R.2: 1 x 450 hp AS Cheetah XVIII, span 11.29 m
-- * WE496 (c/n HPR.142) and WE505 (c/n HPR.143)**
-- WE505 flown with 550 hp Alvis Leonides 502/4
-- H.P.R.2 lost out to Percival P.56 Provost
-- http://www.airwar.ru/image/i/other/hpr2-i.jpg
-- http://all-aero.com/images/stories/handleypagehpr2.jpg

H.P.R.3 - 1952 Herald piston-engined airliner, x 2
- H.P.R.3: 4 x Alvis Leonides radials, span 28.89 m
-- H.P.R.3 1st prototype flew Aug 1955, 2nd 1956
-- Both H.P.R.3 prototypes conv. to Dart-Herald std.

H.P.R.4 - [Project] Production vers. H.P.R.3 Herald
- H.P.R.4: 25 laid down at Woodley, none completed
-- All Leonides Major H.P.R.4s compl. as H.P.R.5s

H.P.R.4 - [Project] 1953 Herald turboprop deriv.
- H.P.R.4: 2 x Napier Eland turboprops, span 28.89 m
-- Armstrong-Siddeley Mamba also proposed

H.P.R.5 - 1953 Miles M.69 Marathon T.II nav trainers
- H.P.R.5: 4 x 340 hp DH Gipsy Queen 173, x 30 Mk.I
-- * 2 x prototypes (XA 249-250, 28 x prod. (XA252-276)

H.P.R.5 - 1949 Miles M.69 Marathon II test bed conv.
- H.P.R.5: Marathon G-AHXU/VX231 engine test bed
-- H.P.R.5 to Air Ministry Specification C.15/46
- H.P.R.5: G-AHXU, 2 x 1,010 shp AS Mamba turboprops
-- BEA order cancelled 1950 (noisier than H.P.R.I)
- H.P.R.5: VX231, 2 x Alvis Leonides Major radials*
-- * Ministry of Supply used VX231 to test DH props

H.P.R.6 - [Project] 1955 short-range high-density airliner
- H.P.R.6: 2 x turbofans or 4 x turboprops,* span 32.00 m
-- * RB.80 Conway turbofans or RB.109 Tyne turboprops
- H.P.R.6: Swept-wing airliner, cruising speed 690 mph

H.P.R.7 - 1957 Dart-Herald/Herald turboprop airliner
- H.P.R.7: 2 x R-R Dart turboprops, span 28.89 m
-- Herald Series 100: Init'l production model, x 4
-- Series 100 as H.P.R.3 but Darts/1.09 m stretch
-- Series 200: Later production model Herald, x 36
-- Series 200 Herald had a 900 kg increase in MTOW
-- Series 300: [Project] Dedicated vers. for USA
-- Series 400: Military vers., x 8 (FM1020-FM1027)
-- Series 500: [Project] Developed Series 400*
-- * 60 pax, 2 x 3,245 shp R-R Dart R.Da.12s
-- Series 600: [Project] 68 pax short-haul vers.
-- Series 700: 60 pax, 2,320 shp R-R Dart R.Da.9s
-- Series 700 devel. specif'ly for Brazil market
-- Const. of c/n 252-257 begun, cancelled in 1966
-- Series 800: [Project] Military vers. of Srs 700

H.P.R.8 - [Project] 1959 car ferry based on Dart-Herald
- H.P.R.8: Nose clamshell doors, 6 x cars + 30 pax*
-- * Or 100 passengers, for Silver City Airways
-- https://www.flightglobal.com/pdfarchive/view/1960/1960%20-%202696.html

______________________________

[1] One exception was the 1948 H.P.93, Miles Messenger fitted with a Dufaylite test wing. Handley Page (Reading) Ltd. performed test flights from Woodley with this wing (Dufaylite was a paper honeycomb material skinned with bonded sheet metal).
______________________________

Amazing work as usual my dear Apophenia.

Thanks a lot Apophenia for a job very well done, as usual.

I have noted a few differences in your data from mine. I don't have time to go into the detail of everything, but for instance, I have:

• Types A and B listed as 1909 types
• Type E/50 called the "Yellow Peril", not the "Antiseptic" (but two nicknames possible)
• Type J found as a "bombing machine" type (but could be a typo from faulty OCR)
• Type M (M/200 and MS/200) also redesignated as H.P. 9
• All types O/400, O/7, O/10 and O/11 also redesignated as H.P. 12
• Type S as a completely different bird from yours, actually the HPS-1 Scout developed for U.S. Navy, later redesignated as H.P. 21
• Types W/400 and the W.8 to W.8c series also redesignated as H.P. 18
• Type T (first series) redesignated as H.P. 19
• Type X (X.4a and X.4b) redesignated as H.P. 20
• Type C/7 Handcross redesignated as H.P. 28 (really don't know where you got the "H.P. 1" from...)
• Type D/4 and Hamlet as two separate projects, redesignated as H.P. 29 and H.P. 32 respectively
• Type W.10 also redesignated as H.P. 30
• Type T (second series) non-existent, actually just from the first series, as H.P. 25 (Type Ta) series was a development of the H.P. 19 Hamlet

I'm not saying my version is correct or more accurate than yours though, just stating that it's different.
Also, I don't have the H.P. 16 as an early Type W, but it would make sense that it was.

Do you happen to have a source for the HP.122 as a VTOL turboprop?

Chris

Chris: Kites, Birds and Stuff - Handley Page Aircraft, P. D. Stemp, Lulu Press, July 2011

Page 99: "Handley Page H.P.122 - A project for a V.T.O.L. type, during 1961. Powered by four Rolls-Royce Tyne engines."

Stéphane: Great stuff ... corrections/additions made. Thanks for confirm the Type X designation And I too would like to know what H.P.48 and H.P.49 were reserved for!

A few other responses ...

Finding dates for HP designs was crazy-making I too have seen Bluebird listed as a 1909 type. The Type A first flew on 26 May 1910, so I went with that. But now I'm doubting my choice on the Type B (with its convoluted history). Finished in 1909 but abandoned by HP before flying, the 'B was flown in 1910 as the Plane Limited Biplane. But, this is an HP list, so 1909 seems to be the important date.

I've seen both "Antiseptic" and "Yellow Peril" applied to the Type D/H.P.4 and the Type E/H.P.5.

Type S: Doh! I had the HPS as Type S in the 'H.P.' listings but forgot to add it to the second Letter Types :-[

Type T: Still confused about this one. Are you saying that (in the second series), the Type T was the H.P.19 Hanley while the Type Ta was its development, the H.P.25 Hendon? That would certainly make sense.

"Chris - Kites, Birds and Stuff - Handley Page Aircraft, P. D. Stemp, Lulu Press, July 2011"

I feared you might say that. Hoped you had an original source.

Thanks

Chris

The original source is the Putnam on Handley-Page I think. There's a little more in the text:

Boo hoo. I was hoping for an original HP document.

Chris

As I think,the missing numbers were unknown Projects,lost there documents.

Funny that Paul shared a page from the Putnam book... I have just finished scanning and turning to PDF the entire list of types from that book, as it hadn't been posted in this thread previously. Here it is (see attachment).

Apophenia said:

Finding dates for HP designs was crazy-making I too have seen Bluebird listed as a 1909 type. The Type A first flew on 26 May 1910, so I went with that. But now I'm doubting my choice on the Type B (with its convoluted history). Finished in 1909 but abandoned by HP before flying, the 'B was flown in 1910 as the Plane Limited Biplane. But, this is an HP list, so 1909 seems to be the important date.

Click to expand...

It's tricky sometimes to put a precise date on a design. Sometimes the same lists make a mish-mash of dates that makes little sense: unbuilt types are only dated according to when they were drafted, but built types are usually given according to their first flight. It makes for a pretty incoherent chronology. A better list should feature the draft date for all types, and add first flight (if there was one) in a separate column (and delivery in another one still). I'm working on something of that sort for H.P. which should clarify a couple of questions.

Apophenia said:

I've seen both "Antiseptic" and "Yellow Peril" applied to the Type D/H.P.4 and the Type E/H.P.5.

Click to expand...

According to the Putnam book, Type D was Antiseptic while Type E was Yellow Peril. But I guess it's not impossible that the two were used for both at the time.

Apophenia said:

Type S: Doh! I had the HPS as Type S in the 'H.P.' listings but forgot to add it to the second Letter Types :-[

Click to expand...

Apophenia said:

Type T: Still confused about this one. Are you saying that (in the second series), the Type T was the H.P.19 Hanley while the Type Ta was its development, the H.P.25 Hendon? That would certainly make sense.

Click to expand...

Apophenia said:

Thanks for confirm the Type X designation.

Click to expand...

Actually even the Putnam book is confused over that particular letter... Type X doesn't get an entry of its own in the book, but rather is mentioned (and illustrated) as part of both the "Handley Page Slotted Wings" chapter and the "C/7 Handcross and D/4 Transport" chapter. The letter covered two very different projects: the Type X Bomber, and the Type X Transport (Spec. 17/21). However, none of these two designs is mentioned in the Appendix list (see PDF), and instead, only the H.P.20 is given as the X/4B (or X.4b) Slotted Monoplane with Liberty 12 engine (which we know was a D.H.9A [F1632] fitted with monoplane slotted wings). Either the "Type X" designation was given to the entire slotted wing research (including D.H.9 and 9A test-beds, bomber and transport projects), OR the terms "Type X Bomber" and "Type X Transport" simply mean "Bomber project using the Type X wing" and "Transport project using the Type X wing". I'm still not sure about which is more likely.

A closer look at the chronology (as explained earlier) makes it clear that Types S (HPS-1 Scout), T (Hanley) and Ta (Hendon) were designated long before the new lettering system appeared. Types S and T were reallocated circa 1921 (as the original Types S and T had not been built), and as the Hendon was a development of the Hanley, it followed suit in 1923. New letter designations (Types C, D and E) were then given circa 1923-24 for new types, but strangely enough, although the new HP- system appeared in 1924 to cover (nearly) all previous designs retroactively, the company continued to allocate letter designations until 1929. Of these, only Types F, H and M are known, but very clearly, the 1921-22 types S and T could NOT be part of that second system.

There probably weren't any letter designations after Type M. It would be logical from looking at design chronology that H.P.22 and 23 could have been Types A and B of the new system, H.P.33 could have been Type G, and H.P.35, 38 and 39 could have been Types J, K and L. But it's PURELY HYPOTHETICAL on my part.

Chris: No such luck, no such access

Stéphane: Corrections made. Thanks for sharing your enhanced HP list I like you theory that Type X may have been applied to the whole slotted wing research programme.

With the 1921-22 types S and T being 'recycled' within the first system, as you show, the second Letter Type designation system becomes even more fragmented and puzzling.

From, Rivista_aeronautica 1943.