November 1937 - tog Tyskland världsrekordet i flyghastighet, då Dr.-Ing. Herman Wurster med en hårt modifierad Me 109, civilregistrerad
som D-IPKY - med 610 km/t......
Britterna, ville inte vara sämre. Dom glissade att deras nya Spitfire, lämpligt modifierad - skulle kunna slå det tyska rekordet.
Dom plockade ut en standard Spitfire MK I serienummer K 9834 som modifierades lika hårt till en Speed Spitfire
Accordingly, a standard Mk I K9834 (the 48th production Spitfire) was taken off the production line and modified for the attempt on the World Speed Record. All military equipment was removed and the hinged gun panels, radio door and flare chute opening were replaced with removable panels. A special "sprint" version of the Merlin II, running on a special "racing fuel" of gasoline, benzol and methanol, with a small amount of tetraethyl lead was able to generate 2,100 hp (1,565 kW) for short periods. This drove a Watts coarse pitch, four bladed wood propeller of 10 ft (3.0 m) in diameter. Cooling the more powerful engine was achieved using a pressurised water system. This required a deeper radiator inside a lengthened duct which extended to the trailing edge of the starboard wing. A larger diameter oil cooler was fitted under the port wing. The wingspan was reduced to 33 ft 9 in (10.28 m) and the wingtips were rounded.
All panel lines were filled and smoothed over, all round headed rivets on the wing surfaces were replaced by flush rivets and an elongated "racing" windscreen was fitted. A tailskid replaced the tailwheel. Finally, the "Speed Spitfire" was painted in a highly polished gloss Royal Blue and Silver finish. As it turned out the finished aircraft weighed some 298 lb (135 kg) more than a standard 1938 vintage Spitfire. Also, in June 1938, the Heinkel He 100 V2 set a new record of 394.6 mph (635.0 km/h), which was very close to the maximum speed the as yet unflown Speed Spitfire was likely to achieve; the first flight of the modified Spitfire took place on 11 November 1938 and, in late February 1939, the maximum speed reached was 408 mph (657 km/h) at 3,000 ft (910 m).
Clearly further modifications would be needed. It was decided to delete the radiator and change the cooling to a "total loss" system. The upper fuel tank was removed and replaced with a combined condensor and water tank. The water was fed through the engine and back to the tank, where as much as possible would be condensed, while the overflow was ejected from the base of the engine as a jet of steam. It was calculated that the Speed Spitfire would be able to make the speed runs and land safely before the water and much reduced fuel would run out at about the same time
Det nya tyska rekordet med He 100's 635 km/t, juni 1938 - krävde ytterligare ändringar på ''rekordspitten''.
I mars 1939 skarvade en He 100 rekordet till 746 km/t - följt av Me 209's flygning i april s.å. - till 755 km/t !
Därmed dog de brittiska ambitionerna.
The Speed Spitfire
modifierades tillbaka till ''o-vanlig'' fotospaningsspitfire (se tipsbild ovan - notera att vingspetsarna
inte visar en vanlig Spitfire)https://www.thisdayinaviation.com/11-november-1937/https://en.wikipedia.org/wiki/Supermari ... d_variants
Frågan är fri!