Ignoring the 2nd London Naval Treaty.

perfectgeneral

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5x Revenge Class refitted as light carriers

Length 750ft waterline (780ft overall)
Beam 90ft (120ft at flight deck)
Draught 28ft
22,000t full load
Propulsion 18 Yarrow small tube boilers, 235 psi
Four Parsons geared turbines producing
91,195 shp (67 MW) driving four shafts
30.5 knots
6000nm at 19 knots
24 x 40mm bofors (12 x 2)
32 x 20mm AA (16 x 2)
Complement: 1,200 (including air group)
Two centreline aircraft lifts (72ft x 46ft) Originally intended as double lifts these could accommodate larger aircraft developed later. (Sea Mosquito, Beaufighter)
The large size of the lifts prevented armoured flight decks in later WWII designs, until unarmoured deck edge lifts with armoured hanger doors were introduced.
48 aircraft (36 Swordfish & 12 Sea Gladiator then 24 Skua & 24 Sea Hurricane)

Edit: Looking at HMS Eagle, I have changed the numbers a bit.
Edit2: Looking at the double hangered HMS Glorious refit of about this time, I think we can do better than the standard set by HMS Eagle.


Base them in Derry/Belfast for North Atlantic and Western Approaches convoy protection. Considering the rough sea states common in the north Atlantic, fully enclosed hangers with doors (to allow engines to run) for the upper hanger would be best. The ventilation doors either side of the lifts would prompt thoughts of deck edge lifts in later designs.

HMS_Revenge_(1925).JPG
 
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Prohibitively expensive. A guarantee waste of money. It would take longer to manufacture triple turrets than to just reuse the existing dual turrets. Better to just build new ships. I believe that the Revenge class hulls didn't have a lot of leeway in either tonnage or space for modification, which is the primary reasons they were not modernized to a great extent.

Maybe just remove either 'X' or 'Y' turret to provide more more internally for boilers or new engines and call it quits.

Remove X and Y turrets, provide a hanger for float equipped Swordfish (actual experince with the Japanese Ise suggests 10 -15 Swordfish), and turn them into battlecarriers for convoy escort - any raider in the vicinity gets the attention of either the 15" guns or torpedoes from the Swordfish.

Very quickly fully develop the float Spitfires (a MkI, a MkVB and a MkIX were actually fitted with floats) and you can give the Condors a very nasty surprise in the middle of the Atlantic.
 

perfectgeneral

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6 Sea Hurricanes are enough of a nasty surprise for any Condor.

Edit: even a Skua (or Gladiator for that matter) could exceed a Condor's ceiling and meet her speed.
 
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Remove X and Y turrets, provide a hanger for float equipped Swordfish (actual experince with the Japanese Ise suggests 10 -15 Swordfish), and turn them into battlecarriers for convoy escort - any raider in the vicinity gets the attention of either the 15" guns or torpedoes from the Swordfish.

Very quickly fully develop the float Spitfires (a MkI, a MkVB and a MkIX were actually fitted with floats) and you can give the Condors a very nasty surprise in the middle of the Atlantic.

Hybrid warships do neither jobs completely right. The Rs served well as convoy escorts in the battleship form, tho in hindsight they should have been scrapped.
 

perfectgeneral

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The British 'Essex' class carrier

HMS Ark Royal

  • Lightly armoured flight deck (0.25")
  • Double (76ft x 46ft) un-armoured deck edge lifts fore and aft of starboard island
  • Lightly armoured (0.25") Hanger sides and doors to access deck edge lifts
  • Lightly armoured (0.25") upper hanger deck
  • Hangars and flight deck an integral part of the ship's superstructure
  • Two hanger deck levels with 18 foot clearance
  • 27,000 tons standard - escalator clause
  • Armoured belt below hangers (3")
  • Armoured lower hanger 'strength' deck (3")
Later ships in the 'class' grew towards the maximum (33,000tons, 40,000tons finally 48,000tons standard) that docks could hold as it was clear that the treaty had failed and war was inevitable.
 
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Later ships in the 'class' grew towards the maximum (33,000tons, 40,000tons finally 48,000tons standard) that docks could hold as it was clear that the treaty had failed and war was inevitable.

Well historically it was obvious the Treaty had failed by 1937 but the RN still spent a lot of time and effort squeezing the 1938 Programme Implacable and 1939 Programme Indefatigable into the 23,000 ton standard limit.

It was only the 1940 programme Ark Royal that saw the Treaty limits abandoned.
 
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