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