Easy see
home plenty still around in 1954. The spares from brand new airframes were Typhoons, thanks to lack of Sabre production, when you count those Typhoons and the 265 airframes in storage end 1943 the RAF could have started Typhoon production around end 1942 instead of mid 1941 and been no worse off in terms of Typhoons with engines as of end 1943. While as of end 1942 three months production of R-2800 in the US would more than supply the entire Typhoon production run.
Spitfire F.21 needed a bigger tail resulting in entry to service being delayed while handling problems were sorted, the 20 series wing gave up some of the high Mach number performance, 122 F.21 built, starting with 1 in April 1944 then from June 1944 to January 1946, the F.22 from March 1945 to February 1946, plus 1 in October 1946, with 264 built. The 78 F.24 built February 1946 to April 1948 (with gaps)
The maximum safe dive speed is mostly about airframe not engine, as expected the Spitfire versions had differences. The general description of the Typhoon is strong. When it comes to safe dive speeds, from another discussion some time ago. The following table is an interesting reference for WW2 limiting mach numbers which are slightly lower than the critical mach number.
Spitfire MK XIV: 0.89
Me-262A : 0.86
Me-163A: 0.845
Me-163B: 0.84
P-51B: 0.84
Gloster Meteor: 0.83
Hawker Tempest: 0.83
P-47N: 0.83
Spitfire Mk IX 0.79
Bf-109G 0.78
Yak-3 0.76
Fw-190 0.75
F4U: 0.73
P-47C: 0.69
P-38: 0.65
One of the major Hurricane myths is the mark IV had Merlin 24 or 27 or even one of the 30 series, the RAF form 78 show Merlin XX only, as do the accident reports which usually include serial numbers, Merlin XX power 1,280HP. The extra protection on the IID and IV degraded performance, that was to be improved with the more powerful engine in the V. The Hurricane V would have the same 8 rockets as the Typhoon but bombs limited to 500 pounds, it would have the 40mm gun option. The Hurricane IIA is quoted as 272 mph at sea level clean, 265 mph with tropical filter, 247mph with 8 rockets, the early Typhoon I 340 mph at sea level clean.
The RAF use of rocket rails is an example of the manufacturing situation, the rails were designed assuming they would increase accuracy, but did not, they had a bigger speed penalty than using stubs but the manufacture penalty to do a change was too great. Another case is the reality most of the allied aircraft doing ground attack work in France in 1944 were optimised for performance above 20,000 feet
The defences plus the needs of other fronts stopped the fighter bomber raids, check out books like Luftwaffe Fighter-Bombers Over Britain: The Tip and Run Campaign 1942-43 Chris Goss, Peter Cornwell. I do like the narrative of how the Typhoon went from one triumph to another.
All the Fw190F and G would disagree with the did it better. The Typhoon fighter bomber changes were authorised on 14 April 1942 after Hawker had suggested it in November 1941, first issued to 181 squadron on 7 September 1942, first operation 28 November. Good to know the Luftwaffe fighter bombers had been seen off by end 1942.
20 January 1943, a three wave assault which gave the defences a better chance to intercept, Typhoons claimed 6 kills, Spitfires 10, against the triumph a Typhoon also shot down a Mustang, pilot killed.
I suppose you do not have a reference like RAF Squadrons by Jefford. 485 formed in March 1941, being a Spitfire unit it rotated between the front line and places like Scotland before being sent to Europe end August 1944, to Scotland end February 1945 to convert to Typhoon/Tempest, reverted to Spitfires on return to Europe in mid April 1945.
486 formed in March 1942 with Hurricanes, received Typhoons in July at Wittering, then North Weald and West Malling before settling in at Tangmere on 29 October 1942, went to Scotland February/March 1944 to convert to Tempest (interesting as the Sabre did not like the cold), Castle Camps most of March 1944, Newchurch end April, to Europe end September 1944. The squadron claimed 241 V-1 according to Brian Cull and Bruce Lander in Diver! Diver! Diver!, making it the second most successful unit.
So far no success finding references listing Tempests dropping bombs or using rockets in combat during WWII, they were mostly air superiority, along with the Spitfire XIV while the Merlin Spitfires more became fighter bombers.
I look forward to the penetrating analysis of 8th Air Force Mustang versus 9th Air Force Thunderbolt in terms of combat claims made and the reverse 8th P-47 versus 9th P-51, then throw in the P-38, showing how much better the ones with the bigger claims were. The P-38 in Iceland versus those in Britain and so on. Typhoons claimed around 50 kills June 1944 to May 1945 inclusive, or about 2 days of June 1944 Spitfire claims. (Silly, isn't it).
The Welkin was 40,000 feet. The altitude band being referred to is the 20 to 30,000 feet one, where the Fw190A found itself in trouble for example but the Bf109 did not. The Sabre meant the Typhoon was lower level, great if the navy and/or army are present, not great if it is air forces trying to defeat each other.
The Hurricanes would be present if the Sabre situation was not sorted, the Hurricane V was the insurance policy.
Don't forget Clostermann quotes the standard mark V as having this sort of performance, compared with the RAF 434 mph, no need to use a prototype, just Clostermann. The Tempest I first flew 24 February 1943, the 4 June tests gave 460 mph at 26,000 feet, further airframe improvements raised that to 472 mph in September. The first production mark V first flew on 21 June 1943, production officially started with 3 in October then from January 1944.
The British wanted reliable engines, the Sabre IV used by the Tempest I never managed to pass the 50 hour test. Total Sabre IV production was 2 in February 1943, then one each in April, July, August and November 1943. No idea how many were used during the Tempest I testing. In any case the pre war High Speed Spitfire I is available for comparison if one offs are counted, or the mark III etc. (Really silly, isn't it).
The only way the Sabre can look good is ignore much of its record. End 1941 facilities earmarked for Sabre reallocated to Hercules, the 1,000 employees at Napier were managing 6 to 8 engines a week. A reason for so many Hurricanes built is the Sabre.
Hurricane exports from April 1940 onwards, destinations as shipped, includes Canadian built sent to Britain then on shipped, Canada either retained Hurricanes built there or exported them incomplete to Britain.
To No.
A.C.S.E.A. 694
Australia 1
Iceland 10
India 1,472
Iraq 56
Kenya 7
M.A.A.F. 88
Med. Air Command 689
Mediterranean 418 (Usually Malta)
Middle East 2,712
North Africa 63
Portugal 90
Russia 3,677
South Africa 19
U.S.A. 2
West Africa 14
Yugoslavia 6
Total 10,018 (plus exports to end March 1940), out of 14,487 built including prototypes