A Spitfire Mk. 21 of 91 Squadron
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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
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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.) |
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Spitfire XXI - Comparison of Estimates With Supermarine Tests
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