Spitfire PR XI

Aeroplane and Armament Experimental Establishment
Boscombe Down

August 1943 Spitfire PR. Mk. XI MB.789
(Merlin 63)
Level speed performance and position error

Summary.

The maximum true air speeds under each condition were:

All-out level speed in F.S. gear     417 mph ASI at 24,200 ft.

Max. cruising speed in F.S. gear   397 mph ASI at 31,000 ft.

The maximum speeds at 38,000 ft. were:

All-out level     387 mph ASI

Max. cruising   378 mph ASI

Full Report Here

Miscellaneous

Spitfire PR XI Aircraft Data Card