Lioré et Olivier (LeO) Prototypes & Projects

[blackkite]

Leo 451 No 359 of Escadrille 6B experimentally modified for use in the mine-sweeping role with dural frame energised by an auxiliary motor. Additional bracing struts were introduced subsequent, and these are illustrated by the general arrangement drawing.

http://aviadejavu.ru/Site/Arts/Art7887.htm

http://aeronavale-porteavions.com/viewtopic.php?f=5&t=2082

 

[Justo Miranda]

Hi

 

[blackkite]

Thanks a lot. Very impresssive aircraft.

I think that top drawing shows LeO 45-01(mod), not LeO 451-01, because the engine is not Gnome-Rhone 14N 20/21.
LeO 45-01(mod) engine is ispano-Suiza 14AA-6 / Hispano-Suiza 14AA-7.

https://www.secretprojects.co.uk/forum/index.php?action=dlattach;topic=9017.0;attach=591113;image

 

[blackkite]

Hi! LeO 48.

http://www.airwar.ru/enc/xplane/leo48.html

"The LeO-48 experimental aircraft established during the German occupation years was intended for research in aerodynamics. It was a wooden monoplane with a sredneraspolozhennym wing. The crew consisted of four persons. The first flight of LeO-48 was carried out on 21 November 1941 under the control of tester Jacques Lekarma, but during the test he was injured and was taken to repair for two months. The second and last flight took place on 5 February 1942, after which the LeO-48 test programme was decided to close and the plane was to be scrapped."

 

[hesham]

Hi,

as I heard,the SNCASE SE-012 was a stratosphere Airplane Project,developed from
LeO-457,has anyone a drawing to it ?.

As we know also the SE-014 was a flying boat Project,also in this series,the SE-010 was the same as SE-400.

 

[hesham]

Hi,

it seemed to be there was a Project for SNACSE,called SE-147,because there was
a Project named SE-247,mention here in reply # 52,confirm needed;

https://www.secretprojects.co.uk/forum/index.php?topic=9739.45

 

[Apophenia]

Odd that there was a numerical link between LeO H-47 and its proposed SE.247 descendant. There's no such linkage between Asantchéeff's H-49 design and the SE.200 which emerges from it.

 

[hesham]

Odd that there was a numerical link between LeO H-47 and its proposed SE.247 descendant. There's no such linkage between Asantchéeff's H-49 design and the SE.200 which emerges from it.

That's right my dear Apophenia.

 

[ridge runner]

Hi all,

Can anyone out there please confirm for me what the cowlings, exhaust. Etc were like on the P&W engined 453. I am planning a model
and can’t find much information. Thank you.

Martin

 

[Arjen]

Rabat image and side views from Profile 173: The Lioré et Olivier LeO 45 Series by Raymond Danel, Profile Publications 1967.
Conversion line image from Lioré et Olivier by Gérard Hartmann, E-T-A-I 2002.

 

[FXXII]

What is a sredneraspolozhennym wing ? Google has no answers.

 

[Aubi]

Mid-fuselage mounted wing.

 

[hesham]

Yes my dear Apophenia,

but SNCASE SE-012 was a real Project,developed from LeO-457.

So weird,

the SNCASE SE.100 also known as SE.10,SE.101 = SE.11,SE.102 &
SE.103 = SE.12,what was really SE.12 ?.

 

[juanT]

LeO-123
"A LEO-12 was purchased in 1932 by the state and fitted with the first operational interior driver's cab built in France, a cab designed by Mr. Humbert of STAé, equipped and converted into the Leo-123 (FÁKDO), it was used after preliminary tests by schnea in August 1932, for studies of route planners, automatic piloting and radio guidance, many night flights took place on this plane..."
text and images from "Aviation Magazine International"

 

[hesham]

From Aviation magazine 1977,so weird;

Already, in 1938, the Leo-48 represented a technical attempt
interesting to offer, to the field of maneuverability of the planes
of cembat, new dimensions. This device had little
time to confirm the speculations of its promoters, But had
you deserve to draw attention to a new formula that sees
currently day. The span was 11.30 m, the length of
8.77 m and the height of 5.57 m, this height being explained by
the vertical surface located forward of the center of gravity. This
surface was 2 m2 above and 1 m° below the fuselage. The canopy itself had an area of 17 m2. With two 140 hp Régnier 4 GO engines, an empty weight of 1,600 kg and a total mass, with three occupants, of 2,100" to the aircraft
should have a maximum speed of around 300 km/h.

 

[Nik]

Well, I've never seen such a mid-fuselage 'dorsal' rudder before. Given the apparent lack of such since, dare we assume that it was, um, a tad unsuccessful ? Compared to eg canards ??

 

[robunos]

https://www.secretprojects.co.uk/threads/de-rouge-elytroplan-lateron-biplane-concept.12838/

cheers,
Robin.

 

[dan_inbox]

I've never seen such a mid-fuselage 'dorsal' rudder before. Given the apparent lack of such since, dare we assume that it was, um, a tad unsuccessful ?

The purpose of the Lioré et Olivier LeO-48 was "recherche aérodynamique anti-rafales", ie aerodynamic research against wind gusts. The extra vertical surfaces were designed to generate "portance latérale", lateral lift.

My personal interpretation of it is:
1- if a transversal wind gust deports you off the right path to the runway for landing, you can get back into alignment without turning the nose, thus avoiding to abort the approach.
2- for a combat airplane it would allow lateral translation during dogfight, to better bounce or evade the opponent. A precursor to himat, afti and such research programs.

As you point out obviously it wasn't developped further. My guess is that the extra weight and exposure to lateral drift made it not worthwhile. Plus, given that there was no computer assistance to the pilot then, managing it properly was probably beyond the ability of most pilots, especially under stress in a dogfight.

 

[Deleted member 4286]

From Aviation magazine 1977,so weird;

Already, in 1938, the Leo-48 represented a technical attempt
interesting to offer, to the field of maneuverability of the planes
of cembat, new dimensions. This device had little
time to confirm the speculations of its promoters, But had
you deserve to draw attention to a new formula that sees
currently day. The span was 11.30 m, the length of
8.77 m and the height of 5.57 m, this height being explained by
the vertical surface located forward of the center of gravity. This
surface was 2 m2 above and 1 m° below the fuselage. The canopy itself had an area of 17 m2. With two 140 hp Régnier 4 GO engines, an empty weight of 1,600 kg and a total mass, with three occupants, of 2,100" to the aircraft
should have a maximum speed of around 300 km/h.

A magnificent photo from the avia éditions booklet on the SE 400; was inspired by the Leo 48 as an aerodynamic demonstrator

 

[Deleted member 4286]

A magnificent photo from the avia éditions booklet on the SE 400; was inspired by the Leo 48 as an aerodynamic demonstrator

and the 2 pages on Leo 48

 

[PhR]

As we know also the SE-014 was a flying boat Project,also in this series,the SE-010 was the same as SE-400.

Hello,
in my listing I have:
SE-010 became SE-400 (1937)
SE-011 became SE-900 (1941)
SE-014 became SE-1100 (heavy long range seaplane 110 T 1941-43)
SE-015 became SE-1000 (stratospheric 4-engined transport aircraft, 1941)
SE-016 was a project for a small passenger plane using an car engine (1942)
SE-017 was a training seaplane (1942)
SE-018 was a project for a transport autogyro (1941)
SE-050 became SE-2000
SET-053 became SE-2100

 

[hesham]

SNCASE SE-012 was a real Project,developed from LeO-457

Amazing work,

also this one.

 

[PhR]

In LeO H24 family, I add the LeO H243 twin-engine project, and also the amphibian projected version LeO H245.

 

[PhR]

The LeO 29 was a 4-seat night bomber, category BN4, designed in 1929 by Marcel Riffard. A model of its wing was tested at Saint-Cyr wind tunnel.

 

[PhR]

Nice pages on the LeO H.42 and H.43 from a vintage company brochure, enhanced from poor scans in the Philippe Veys collection:

Lioré et Olivier presented two versions to CEPANA examination commission in 1932 for scout seaplanes: the H42 and the H42bis.
H42 was powered by 3 Gnome & Rhône 14 Kbr 700 hp or by 3 Gnome & Rhône 14 Kdrs 900 hp.
The engines planned for the H-42bis were 3 Hispano-Suiza 12 Nbr 650 hp.

 

[PhR]

LeO 45.01 First prototype, powered by two Hispano-Suiza 14AA-6 / Hispano-Suiza 14AA-7 radial piston engines.
LeO 451.01 The first LeO 45.01 prototype was redesignated, fitted with two Gnome-Rhone 14R engines.

Hello,
sorry Blackkite, but I don't fully agree: the LeO 45-01 first prototype, initially fitted with 14Aa 08/09 1120 hp engines, was finally modified with 14N 20/21 in September 1938. One year later, after the end of its tests, it was assigned to GB I/12 bomber group, at Caen-Carpiquet. It was finally destroyed and burned at Auxerre in June 1940, as seen attached. It was never fitted with 14R engines.
Nevertheless, the attached photos confirm its redesignation from LeO 45-01 into LeO 451-01.

 

[hesham]

The LeO 29 was a 4-seat night bomber, category BN4, designed in 1929 by Marcel Riffard. A model of its wing was tested at Saint-Cyr wind tunnel.

OMG,

my dear Philippe,I swear by my God,I already mentioned it in my book,but as unknown aircraft led to develop LeO-30,there is no gaps between Type 1 to 30,many thanks.

Can you give us more Info about it ?.

 

[PhR]

Unfortunately, due to their huge size, my plans of LeO 32 are very difficult to reproduce. I attach a photo of the interior planned for this 4-engine transport for 54 passengers.