The Centaur carrier fleet - a better fate...

It seems like the RN waved these small carrier designs under the noses of government like bait. Then as soon as the government showed any interest, BAM! out came the 55,000t design and all the reasons why it was the only way to go.

That said, the RN is right, the bigger the better.
 
The minimum size effective carrier with jets on it is a Midway. More like 45-51ktons.

Depends what you mean with "jets". But if it means "supersonic all weather", yeah, that size you mention is the absolute minimum across three generations starting with the Phantom.

On the french side, PA58 Verdun (1960) and CdG (2000) are both in a 42 000 - 45 000 tons ballpark: 10 000 tons more than Clems and their handful of Crusaders, eight in an ordinary day. Note that Rafale is the (compact) size and weight of a Hornet, itself a lighter package than any Phantom. And of course PA-NG will move to the full Kitty Hawk size and weight - if France can ever fund such (nuclear) beast. It will probably stay a one-shot like CdG.
 
So maybe not so far fetched an idea as you might think for the period.
True, but it seemed to stem from trying to fit two operators into the back of the Gannet. The RN insisted on two operators due to the endurance of the aircraft and they felt having just one was not feasible so the Treasury followed the logic that the alternative was do without.
(I doubt the Treasury guy who suggested it was that well read up on the subject, he seemed to barely know how aircraft were built given his comments in a few documents!)
 
The minimum size effective carrier with jets on it is a Midway. More like 45-51ktons.
Pretty much this. The modernized Essex class were right at 45,000 tons after their SCB-27C/125 conversions. And even though the Navy crammed a huge air group into them, they had to use smaller and older planes to do it. Had they flown Phantoms and Intruders, the air group would have dropped from 60 strike/fighters down to 40ish.
 
Perhaps we may need a thread for a Centaur replacement. Perhaps the 40,000 ton Carrier that the British government kept trying to get the RN adopt in place Of CVA 01.
Or something akin to the 1952 design
 
Intersting size comparison of HMS Centaur and Eagle, at Malta in 1965 :
View attachment 729230
Here’s one of Victorious, Ark Royal and Hermes.
Vic is disproportionally large I believe due to the camera lens. (there’s a picture of Invincible and Illustrious with a similar thing going on)
but with Ark and Hermes you can definitely see the true size difference. IMG_3830.jpeg
 
So like Eagle and Ark Royal in the 60s and 70s.
Sort of. An Essex class could still embark 2xVF and 2xVA squadrons plus AEW, VAQ, VFP, COD and Helicopters. They had significantly larger hangers than Ark Royal did, and used a permanent deck park. So even with bigger planes like the Phantom and Intruder, they'd still have a total air group of between 59 and 64 aircraft.
 
Doesn't that depend on just how long the maintenance between flights takes? 8 fighters flying 2 on 6 off gives ~5 hours to do maintenance between flights.

In 1967 ~250 Israeli aircraft flew ~350 sorties on the first day of Operation Focus, or about ~1.4 sorties per plane per day. In 1973 ~400 Israeli aircraft flew ~11,200 sorties in 19 days, or ~1.5 per day. In 1982 an average of 22 SHars flew 1,300 sorties in 45 days, or ~1.3 per day. In 1991 PGW some ~2,500 aircraft peaked at ~3,500 sorties in a day, or ~1.4 per day.

These are the numbers I recall off the top of my head, and are remarkably consistent over time.
 
In 1967 ~250 Israeli aircraft flew ~350 sorties on the first day of Operation Focus, or about ~1.4 sorties per plane per day. In 1973 ~400 Israeli aircraft flew ~11,200 sorties in 19 days, or ~1.5 per day. In 1982 an average of 22 SHars flew 1,300 sorties in 45 days, or ~1.3 per day. In 1991 PGW some ~2,500 aircraft peaked at ~3,500 sorties in a day, or ~1.4 per day.

These are the numbers I recall off the top of my head, and are remarkably consistent over time.
IIRC, the USN says that they can fly between 2-3 sorties per plane, per day for 3-4 days. After which, the carrier will have to be pulled off the line to rest, refit, conduct aircraft maintenance, and replenish fuel and ordnance
 
IIRC, the USN says that they can fly between 2-3 sorties per plane, per day for 3-4 days. After which, the carrier will have to be pulled off the line to rest, refit, conduct aircraft maintenance, and replenish fuel and ordnance

That wouldn't surprise me, apparently the Hornet was the first plane that didn't require a backup plane ready to go when a mission was planned, F14s and A6s certainly did. The Hornet was also the plane that got the USN on par with the USAF for flight safety; ie crashes per flight hour of whatever the measure is. The RAAF bought heaps of Hornets expecting to crash them like Mirage IIIs and F111, but only lost 4 in 33 years!

Knowing you don't need 3 aircraft ready to fly a 2 plane sortie, and knowing you won't be constantly repairing planes that have had all sorts of minor crashes transform what a CVW can do. it's why the 4 sqn CVWs of today are more 'productive' than 5 sqn and multiple supporting flights of the Cold War CVWs.
 
Pretty much this. The modernized Essex class were right at 45,000 tons after their SCB-27C/125 conversions. And even though the Navy crammed a huge air group into them, they had to use smaller and older planes to do it. Had they flown Phantoms and Intruders, the air group would have dropped from 60 strike/fighters down to 40ish.
It might seem a little obvious and a little off topic, in which case I apologise, but as you do rightly allude SSgtC, with your "they had to use smaller and older planes to do it", while appreciating that modern aviation companies only made aircraft to spacifically and lucrative government/military OR/RfP's. I'm somewhat surprised that a given aircraft company didn't use their expertise to privately develop and market a spacific modern smaller and lighter weight carrier-based fighter-bomber design, not just for the potential of the 'modernized Essex class', but for the other various light aircraft carrier operators throughout the world who operated the likes of the Majestic-class (India, Australia, Argentina, Brazil), the French and Spanish navy's and of course the Royal Navy's oddbodge of needy carriers......
I fully appreciate that such a specialised design would have a limited market, but a market just the same. Add to this, come the 1970's, there appeared to be some appreciation that large, heavy and ultra complex fighter-bombers wasn't always the answer for every air force throughout the world. So perhaps as a sensible cost of measure/cost offset, such a modern light carrier-based fighter-bomber could be de-carrierised and marketed as a cost-effective land-based fighter-bomber, with all it's carrier- centric gear removed to improve it's performance further (similar gains as in the case of the Vought F-8 to V-1000 proposal).

(Now saying this, I know and appreciate that Douglas, Grumman and Northrop did design and propose given private designs in the 1950's and 1960's, but a modern 1970's era design incorporating all the known traits and requirements of modern carrier/aerial warfare - modern compact radar, medium-range AAM's, highest thrust-to-weight ratio for short decks and useful warlords.....)

Anyhow, I guess this has been more of a thought bubble than a question - sorry.

Regards
Pioneer
 
The problem for the RN is that the Forrestal class set the standard for aircraft carriers from the late 50s. The Nimitz class then raises the bar further in the 70s.
CVA01 (as its designation indicates) was an attempt to squeeze a Forrestal into a ahip that the UK could afford.
Anything smaller than CVA01 becomes an ASW/Commando ship as it cannot operate the Phantom/Buccaneer combo (or the early 60s Fighter/Attacker jets planned for CVA01).
The nuclear submarine programne (both SSN and SSBN) gives the RN its new capital ships while the Soviet submarine fleet provides it with a focus on ASW rather than surface force projection.
The QE/PoW revisits the CVA01 dilemma three decades later. The RN gets a Midway class ship but now reallly needs a Nimitz/Ford nuke carrier.
 
Assuming the Forestall is 'the' benchmark, that doesn't make everything else useless for everyone else. The Phantom was 'the benchmark' fighter of the 60s. However few counties could afford or otherwise access it so had to choose Lightning, Mirage III or F104 etc instead and these aircraft were able to serve the countries that acquired them well enough in the circumstances.

The same applies to the CVA01, sure it's no Kitty Hawk class but its far and way more capable than every other ship in the world for rhe duration of the Cold War.
 
In 1967 ~250 Israeli aircraft flew ~350 sorties on the first day of Operation Focus, or about ~1.4 sorties per plane per day. In 1973 ~400 Israeli aircraft flew ~11,200 sorties in 19 days, or ~1.5 per day. In 1982 an average of 22 SHars flew 1,300 sorties in 45 days, or ~1.3 per day. In 1991 PGW some ~2,500 aircraft peaked at ~3,500 sorties in a day, or ~1.4 per day.

These are the numbers I recall off the top of my head, and are remarkably consistent over time.
While instructive, CAP flights are relatively easy on the airframe. Take off, go to your orbit racetrack, orbit for ~2hrs, come back to the boat and land.

I'd expect the primary issue to be missile rail time. Putting all those flight hours on missiles without expending them.
 
Sure, but no air force seems to have been able to do it in the 2nd half of the Cold War. The majority of the 1300 SHar sorties were CAP missions. Keep in mind that when a plane flies 25 hours then it's down for a 25 hour inspection, another 25 hours and it's a bigger 50 hour inspection, then another 25 hour before the bigger again 100 hour inspection. All of this is without things actually going seriously wrong or any battle damage.

It's not just maintenance but also pilots that are a limitation. IIRC 800 NAS with 12 SHars had 15 pilots and 801 NAS with 8 SHars had 11 pilots. Apparently flying a fighter sortie is like playing a game of football, they land drenched in sweat and the breathing oxygen dehydrates them. The there's all the admin, the general wing/squadron briefing for weather, frequencies, callsigns etc then the individual mission planning and post mission debrief. The number of sorties a plane flies is closely linked to the number of pilots the sqn has.

Not that some planes won't fly over and over again, but for every one of those there's 'Christine' a RAAF MB326 Macchi that the techos got the Padre to perform a mock exorcism on because demonic possession was the only plausible reason for it's unreliability.
 
Sort of. An Essex class could still embark 2xVF and 2xVA squadrons plus AEW, VAQ, VFP, COD and Helicopters. They had significantly larger hangers than Ark Royal did, and used a permanent deck park. So even with bigger planes like the Phantom and Intruder, they'd still have a total air group of between 59 and 64 aircraft.
Eagle and Ark had dual hangars, a Quirk of the superior Armoured hangar design. Both ships dual Hangars were originally the same length, (364 feet). However due to refits the lower hangar was reduced to either 217 ft or 172ft (I’m unsure which) to provide more accommodation. So the original audacious actually has more hangar space than an essex (a combined 728 ft compared to 552 ft for an Essex)
 
Eagle and Ark had dual hangars, a Quirk of the superior Armoured hangar design. Both ships dual Hangars were originally the same length, (364 feet). However due to refits the lower hangar was reduced to either 217 ft or 172ft (I’m unsure which) to provide more accommodation. So the original audacious actually has more hangar space than an essex (a combined 728 ft compared to 552 ft for an Essex)
As designed, the Audacious class had a  slightly bigger hanger of 47,372 square feet compared to the Essex class having 45,780 square feet. But during the modernization of both classes, the Essex class was able to keep their full hangar space, while the Audacious class lost roughly 10,000 square feet of hanger space. But beyond the raw square footage of the hangers, the layout is what really kills the British air group size. Because of the dimensions of the hanger, the British, no matter how the angled their aircraft, could not fit 3 abreast in the hanger. The US could (one in the middle facing aft, and another on either side facing forward, letting the wings and fuselages nestle together, then reverse it for the next row with the center aircraft facing forward and the outboard ones facing aft, and so on and so forth). That let the US pack more aircraft into the same square footage. And due to hangar design again, the British needed to leave more "spots" open to maneuver their aircraft around and avoid becoming deck locked.

Just as a side by side comparison, on her last deployment, Ark Royal went to sea with a total of 40 aircraft on board, only 26 of which were jets (12 Phantoms and 14 Bucs). And she was pretty much maxed out with that air wing. Meanwhile, on her last deployment, Oriskany went to sea with her typical 70+ aircraft embarked, which included 60 fast jets (20 Crusaders, 4 Recon Crusaders, and 36 Corsairs). And if needed, she could have embarked even more if needed (she did not have any permanently assigned COD aircraft or Electronic Attack/Tankers in her final Air Wing).
 
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Eagle and Ark had dual hangars, a Quirk of the superior Armoured hangar design. Both ships dual Hangars were originally the same length, (364 feet). However due to refits the lower hangar was reduced to either 217 ft or 172ft (I’m unsure which) to provide more accommodation. So the original audacious actually has more hangar space than an essex (a combined 728 ft compared to 552 ft for an Essex)
As I described in this post https://www.secretprojects.co.uk/threads/aircraft-carrier-hangar-design-discussion.42009/post-614119

Both lower hangar dimensions were correct (and so was 295' & 217') - it just mattered when they were measured, and on which ship. ;)

The 364' for the lower hangar was "as built" for both ships.

During Eagle's 1959-64 modernization her aft lift was restricted to the upper hangar deck and flight deck, with the aft section of the lower hangar and the bottom level of the aft lift well being converted into workshops, accommodation for the increasing number of technical specialists (for the ever-increasing electronics etc on both ship & aircraft), and so on, leaving the lower hangar 172' long.

Ark Royal's 1958-59 "special refit" saw the aft lift similarly restricted, with the aft 69' of the lower hangar being converted to weapons storage & assembly and the bottom level of the aft lift well being used for accommodation - leaving the lower hangar at 295'. The side lift (which served only the upper hangar and flight deck) was also removed.

Ark Royal's 1966-70 "Phantomization" refit saw a further 78' of the aft lower hangar converted to workshops etc, leaving the lower hangar at 217' long.
 
Just thinking, this is a great example of the cube law. The Eagle is only a bit longer, wider and higher than the Centaur but she's almost double the volume/displacement.
In an earlier post I made on this thread there’s a picture which gives a far better comparison between Eagle’s sister Ark Royal (the carrier in the centre) and Centaur’s sister Hermes (the carrier furthest away)
Here’s one of Victorious, Ark Royal and Hermes.
Vic is disproportionally large I believe due to the camera lens. (there’s a picture of Invincible and Illustrious with a similar thing going on)
but with Ark and Hermes you can definitely see the true size difference.View attachment 729239
 
Here is a good comparison - displacements are full load, that of Hermes reflects "as completed", her 1964-66 refit (which gave the longer port catapult shown in the drawing) brought her full load to 31,070 tons. CVA-01's is an estimate from her 55,000 ton "standard" displacement, it might have ended up a little more:


RN Carriers actual & planned.jpg
 
Here is a good comparison - displacements are full load, that of Hermes reflects "as completed", her 1964-66 refit (which gave the longer port catapult shown in the drawing) brought her full load to 31,070 tons. CVA-01's is an estimate from her 55,000 ton "standard" displacement, it might have ended up a little more:


View attachment 729679
What desing is the previous CVA-01. Very interesting, less displacement than the Eagle, but more big fly deck and hangar. Not fan of 2 island.
 
What desing is the previous CVA-01. Very interesting, less displacement than the Eagle, but more big fly deck and hangar. Not fan of 2 island.

I learned about the island thing here in February, and will repeat like a good schoolkid.

British carriers have big (or 2) islands because they didn't have a gallery deck between the flight deck and hangar roof. The British believed that a ship needed a 120' beam to have a gallery deck, otherwise the ship wouldn't be stable. So the big island makes perfect sense, its a simple design constraint/compromise.
 
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I learned about the island thing here in February, and will repeat like a good schoolkid.

British carriers have big (or 2) islands because they didn't have a gallery deck between the flight deck and hangar roof. The British believed that a ship needed a 120' beam to have a gallery deck, otherwise the ship wouldn't be stable. So the big island makes perfect sense, its a simple design constraint/compromise.
Thanks for the info.
what i try to say, before this replay, is i like the design, but with traditional island.
The design name , as far I understands, its 1952 Fleet carrier.
Is less big, that the audacious class ( 1000 tons9 but have more deck, and more hangar space
Even you can put 2 60m catapult
I find this in Shipbucket
Her foward lift is biger enough , that can fix a Scimitar with out folding her wings and nose.
If anyone have more info, i 'll appreciate

1716418771139.png
 
Thanks for the info.
what i try to say, before this replay, is i like the design, but with traditional island.
The design name , as far I understands, its 1952 Fleet carrier.
Is less big, that the audacious class ( 1000 tons9 but have more deck, and more hangar space
Even you can put 2 60m catapult
I find this in Shipbucket
Her foward lift is biger enough , that can fix a Scimitar with out folding her wings and nose.
If anyone have more info, i 'll appreciate

It's the same size (more or less) as the Malta class design that proceeded it and the CVA01 that succeeded it, IE as big as the Britain could build and maintain with existing infrastructure.


Here we go..

Length :870ft fd, 815ft wl, 780ft bp. Without bridal catcher we'd add about another 3ft each end for the safetynetting.

Beam: 116ft
Width 160ft fd, overall ? (at least another 18ft (half the lifts 36ft)to cope with the deck edge lift and the othersides 'furniture' would take it higher).

Draught 33.5ft (the limit really for a number of reasons)
Displacement 53,150tons
Armament six twin 3" turrets, and some minor guns (such as signal guns etc...)
Machinary four sets of Y300 for 190,000shp in the tropics or 205,000shp on temperate conditions.
Speed of slightly over 32kts deep and clean, or slightly over 30kts deep and dirty (six months out).
Endurance of 6,000nm at 22.5kts.

Two catapults, BS mk4 one waist 199ft, one bow 151ft strokes. Both using 650psi
199ft stroke = 60,000lb to 113kts
151ft stroke = 35,000lb to 126kts

Four wires and mk13 arrestor engines. 30,000lb at 105kts, 35,000lb at 97kts, 40,000lb at 90kts, 45,000lb at 85kts.

Three lifts each to move 40,000lb in 20-25seconds, heavier loads at lower speeds. Each of centerline lift (not actualy centerline but slight biased to one side) 66ft by 44ft, deck edge 66ft by 36ft.

Two 984 radars, and the CDS on twin posidon computers, 48 track version with 8 intercept positions on the two deck AIO design as per Ark Royal. This with DPT.
Secondary short range set Type 992
Surface search set Type 974.
Type 963 CCA
TACAN beacon (AN/URN-3)
F.V.11 (VHF/DF)
IFF mk 10.
Type 176 Sonar.

Which I think is enough to be going on with for now.
 
Thanks for the info.
what i try to say, before this replay, is i like the design, but with traditional island.
The design name , as far I understands, its 1952 Fleet carrier.
Is less big, that the audacious class ( 1000 tons9 but have more deck, and more hangar space
Even you can put 2 60m catapult
I find this in Shipbucket
Her foward lift is biger enough , that can fix a Scimitar with out folding her wings and nose.
If anyone have more info, i 'll appreciate

View attachment 729740
Yes, it seems a great pity that the British government/RN never had the fortitude to build and consolidate its ORBAT with such a carrier design.

Regards
Pioneer
 
Yes, it seems a great pity that the British government/RN never had the fortitude to build and consolidate its ORBAT with such a carrier design.

Regards
Pioneer
Unfortunately, as I understand it at the time this ship was considered the RN was in a fight for its life to retain the carrier fleet, and any new ships were not politically viable.
 
Unfortunately, as I understand it at the time this ship was considered the RN was in a fight for its life to retain the carrier fleet, and any new ships were not politically viable.
Thanks for that insight CV12Hornet, makes sense.

Regards
Pioneer
 
Unfortunately, as I understand it at the time this ship was considered the RN was in a fight for its life to retain the carrier fleet, and any new ships were not politically viable.
You could pretty well make that point from roughly 1919 to the present day.
 
It's the same size (more or less) as the Malta class design that proceeded it and the CVA01 that succeeded it, IE as big as the Britain could build and maintain with existing infrastructure.

Rule
Looking the spec, thta you give me, the 1952 Flete Carrier, will have the same configuration (catapults) than Ark and Eagle. 1long -waist- 1 short -bow-.
Looking thr draw, the bow cat, do not interferes with the foward lift, so you could put 2 199fts catapult.
Thas is interesting, so you can operate a full airgroup of F-4 Phantom (airi to air and strike role). I don´t if only FG.1 or even F-4J
1716732287331.jpeg
 
Rule
Looking the spec, thta you give me, the 1952 Flete Carrier, will have the same configuration (catapults) than Ark and Eagle. 1long -waist- 1 short -bow-.
Looking thr draw, the bow cat, do not interferes with the foward lift, so you could put 2 199fts catapult.
Thas is interesting, so you can operate a full airgroup of F-4 Phantom (airi to air and strike role). I don´t if only FG.1 or even F-4J
View attachment 730056
Still has a flight deck elevator instead of a deck edge elevator... What on earth is up with the British not liking Deck Edge elevators?
 
Still has a flight deck elevator instead of a deck edge elevator... What on earth is up with the British not liking Deck Edge elevators?
The freeboard to the hangar deck, or lower hangar deck in the case of the double hangared ships.

In rough weather you really don't want a lot of water sloshing around the hangar deck, unable to get out and destabilising the ship.

The "final" open, single hangared Malta design had 2 side lifts, but it had greater freeboard at hangar deck level.
 
Still has a flight deck elevator instead of a deck edge elevator... What on earth is up with the British not liking Deck Edge elevators?
Scott
I dont have a problem with that.
My comentary is about catapults configuration.
1 151fts a 199fts, like the Ark.
But I think they could have 2 x 199, If you see the foward lift position. ( The bow cats no interfere with then, if you put a longer cat in the bow)
 
Still has a flight deck elevator instead of a deck edge elevator... What on earth is up with the British not liking Deck Edge elevators?
The British planned for the Atlantic and North Sea to be their primary operating theaters in the event of a NATO/WARPAC war. In that environment, a centerline lift makes more sense than a deck edge lift on anything smaller than a Forristall with its roughly 70' of freeboard
 
I wouldn't get too hung up on what length catapult the 52 design would have given the concept was dropped in 1953, before the steam catapult was fitted to a ship and long before the 151' BS5 was invented let alone stretched to the 199' BS5A.

In addition the figures don't look quite right. I think the Eagle was 55,000t deep load (I think that's pushing it), whereas the 52 design was 55,000t standard and would have been over 60,000t deep load so was likely going to be somewhat bigger than the Eagle.
 
I have to admit to a bit of curiosity about the 1952 carrier's manning numbers. Did they ever get far enough along in the design process to come up with a crew compliment?
I wonder how they compare with CVA 01 which came in at 3200 officers and men?
 
I think it wold be similar, but the balance would probably be different at the start. The 52 design had 200,000hp and 4 shafts so would need more men than CVA01 135,000 and 3 shafts, but I think the CAG on the 52 design would be smaller because the aircraft were less complex and needed less men despite their greater numbers.
 
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