A Spitfire Mk. 21 of 91 Squadron5
Vickers Armstrong Ltd.
Supermarine Works
27 May 1943
Spitfire VIII Conversion JF.319
Spitfire F. Mark 21 - Griffon 61
Performance Tests Of Prototype DP.851
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. |
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| (b) | Maximum rate of climb | 4800 Ft./Min. at 7700 ft. |
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| (c) | Time to 30,000 ft. | 7.85 mins. |
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| (d) | Service ceiling | 42,800 ft. |
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| (e) | Coolant and oil suitabilities: | Full tropical under combat climb conditions. |
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View DP.851 Report Here
Vickers Armstrong Ltd.
Supermarine Works
10 September 1943
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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| (b) | Maximum level speed in M.S. gear | 432 m.p.h. at 12200 ft. |
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View PP.139 Report Here
Aeroplane and Armament Experimental Establishment.
Boscombe Down
10 October 1945
Spitfire F. Mk. 21 LA.187
(Griffon 61)
Climb and Level Speed Trials
Summary
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. |
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| " | MS gear, | +9 lb/sq.in., 2600 rpm = 2740 ft/min. at 14,200 ft. |
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| " | FS gear, | +21 lb/sq.in., 2750 rpm = 3615 ft/min at 19,200 ft. |
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| " | FS gear, | +9 lb/sq.in., 2600 rpm = 2125 ft/min. at 29,000 ft. |
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| Estimated service ceiling, | 2750 rpm = 43,400 ft. |
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| " | 2600 rpm = 42,400 ft. |
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| Combat level speed (+21 lb/sq.in., 2750 rpm) = | * 406 mph at MS gear full throttle height (7000) ft. |
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| " | * 442 mph at FS gear full throttle height (21,800 ft.) |
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| " | 446 mph at FS gear full throttle height (22,600) ft.) |
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View LA.187 Report Here
Miscellaneous
Spitfire XXI - Comparison of Estimates With Supermarine Tests
Spitfire XXI Aircraft Data Sheet
No. 91 Squadron took deliveries of Spitfire XXIs in January 1945, with first operational use coming on 10-April-1945.
Spitfire 21 rate of roll
Griffon 64 Operating Limitations
Griffon 69 Operating Limitations
Griffon 69
