Supermarine Works 27 May 1943 Spitfire F. Mark 21 - Griffon 61
Summary of Results At an all-up weight of 9000 lb. and with combat rating of 2750 r.p.m. and 18 lb. boost: |
(a) | Maximum level speed | 455 m.p.h. at 25,600 ft. |
(b) | Maximum rate of climb | 4800 Ft./Min. at 7700 ft. |
(c) | Time to 30,000 ft. | 7.85 mins. |
(d) | Service ceiling | 42,800 ft. |
(e) | Coolant and oil suitabilities: | Full tropical under combat climb conditions. |
Level Speeds |
Rate of Climb |
Level Speeds |
Rate of Climb |
Spitfire F.21 - 2nd Prototype PP.139
Brief Level Speed Tests
Summary of Results
At an all up weight of 9070 lb. and under engine conditions of 18 lb/sq.in. and 2750 r.p.m., the results are:- (a) Maximum level speed in F.S. gear, 460 m.p.h. at 25600 ft.
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Level Speeds and Boost |
Spitfire F. Mk. 21 LA.187
(Griffon 61)
Climb and Level Speed Trials
...........Climb and level speed performance trials have been completed on this aircraft, the first production Spitfire 21. The salient results were as follows :- |
Rate of climb at full throttle height, | MS gear, | +21 lb/sq.in., 2750 rpm = 4440 ft/min. at 4900 ft. |
" | MS gear, | +9 lb/sq.in., 2600 rpm = 2740 ft/min. at 14,200 ft. |
" | FS gear, | +21 lb/sq.in., 2750 rpm = 3615 ft/min at 19,200 ft. |
" | FS gear, | +9 lb/sq.in., 2600 rpm = 2125 ft/min. at 29,000 ft. |
Estimated service ceiling, | 2750 rpm = 43,400 ft. |
" | 2600 rpm = 42,400 ft. |
Combat level speed (+21 lb/sq.in., 2750 rpm) = | * 406 mph at MS gear full throttle height (7000) ft. |
* 442 mph at FS gear full throttle height (21,800 ft.) | |
446 mph at FS gear full throttle height (22,600) ft.) |
Spitfire XXI - Comparison of Estimates With Supermarine Tests
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