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Depending on the supercharger fitted, engines were rated as low altitude (e.g.; Merlin 66, Griffon III), where the engine produced its maximum power below about 10,000 feet (3,000 m), medium altitude (Merlin 45), where the engine produced its maximum power up to about 20,000 feet (6,100 m), and high altitude (Merlin 70), where the engine produced its maximum power above about 25,000 feet ...
The Speed Spitfire was a Supermarine Spitfire Mk I, re-engined and modified for an attempt on the world air speed record. It was already outdated when it first flew in 1938 and, despite repeated modification, never attained a competitive performance.
The first test of the aircraft was in intercepting V1 flying bombs and the Mk XIV was the most successful of all Spitfire marks in this role. When 150 octane fuel was introduced in mid-1944 the "boost" of the Griffon engine was able to be increased to +25 lbs (80.7"), allowing the top speed to be increased by about 30 mph (26 kn; 48 km/h) to ...
The carburettor air intake on early to mid-production Spitfire IXs was a different shape from those of single-stage engined aircraft; they were shorter and had a wider air inlet. From 1943, an "Aero-Vee" tropical filter in a long, streamlined fairing was introduced for the carburettor air intake.
At the time the record of 352 mph (566 km/h) was held by Howard Hughes flying a Hughes H-1 racing aircraft. [nb 6] Although an early Spitfire I was capable of 362 mph (583 km/h), this was at a full-throttle height of 16,800 ft (5,100 m); the regulations for the world speed record demanded that the aircraft fly a 1.86-mile (2.99 km) course at an ...
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A Royal Aircraft Establishment report (No. E.3932) of March 1942 estimated the performance of the Spitfire fitted with a Crecy engine and compared this to a Griffon 61-powered variant. The report stated that the Crecy's maximum power output would be too much for the Spitfire airframe but that a derated version would have considerable ...
Audio recording of Spitfire fly-past at the 2011 family day at RAF Halton, Buckinghamshire Supermarine Spitfire G-AWGB landing at Biggin Hill Airport, June 2024. The Supermarine Spitfire is a British single-seat fighter aircraft used by the Royal Air Force and other Allied countries before, during, and after World War II.