Fastest WW2 Prop Fighters at Sea Level

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No, check the link. 100/130 + water at 60''
Also btw F2G-1 655kph is at 100/130 Military Power at 52'' . So probably the fastest in power setting to weight.
Ok it's been corrected
 
Added Spitfire Mk 21 with Griffon 61 engine and +18lbs/in boost

Based on Spitfire Mk.21 - PP.139
(2nd prototype of Mk 22)

375mph at SL
460mph at Optimal Altitude

View attachment 759355

Quick question….
Was the +21lbs/in boost for Griffon 61 also used during WW2?

Griffon 61 Spitfire with +21lbs/in boost would have 628km/h at SL

Edit: Yes, +21lbs boost was also used in WW2

Added Spitfire with +21lbs boost also to the list

View attachment 759360
About the Supermarine machines, IIRC - the Spiteful was flown in prototype form during wartime - making 408mph @ S-L, on test.
 
This chart shows an early series Tempest Mk V (long-cannon, fishplates, wing-spar bumps - all cost speed) to be capable of 640.5 km/h,
at S-L, in 1944 - on a boost level - that was surpassed by later more highly developed Sabre powered Tempests.


(There is a Mk VI* tested on +17.25 lb, doing - 673 km/h @ S-L - graphed, in a 'Flight' article on annular radiators, somewhere in this forum)

*Annotated as a 'Standard Mk VI', to distinguish it from the annular nose-jobs)
 
Some knowledgeable comments here (as expected!) especially regarding fuel and airframe configurations.
AS WE ALL KNOW (!!) factory figures can be um suspect. The most reliable data are from independent evaluations such as Wright Field, Pax River, Boscombe Down, etc.
 
Some knowledgeable comments here (as expected!) especially regarding fuel and airframe configurations.
AS WE ALL KNOW (!!) factory figures can be um suspect. The most reliable data are from independent evaluations such as Wright Field, Pax River, Boscombe Down, etc.
Well, it was incumbent on service test pilots not to buy the company bullshit - & duly establish/certify the performance parametrics their
combat flier peers were going to 'put their lives on the line' - with. (Plus provide evidence - if contract undertakings were not being met).
 

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