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The British measured boost pressure as lbs./sq.inch (or psi) above a nominal value of atmospheric pressure at sea level. A reading of +6 meant that the air/fuel mix was being compressed by a supercharger blower to 20.7 (rounded figure) psi before entering the engine; +25 meant that the air/fuel mix was being compressed to 39.7 psi – 14.7 psi ...
MK-3-12 (1907), a Russian naval main weapon that used three 12-inch guns in a single mounting; Mark 12 torpedo (1930), an American 21-inch torpedo; 5"/38 caliber gun or Mark 12 5"/38 (1934), a widely used American 5-inch naval gun; 18 inch Mark XII torpedo (1935), a British 18 inch torpedo; Supermarine Spitfire Mk XII (1942–1944); the first ...
The wheels were occasionally fitted with disc-style covers. A later model IFF was fitted, replacing the aerials from the tailplane tip to fuselage with a rod aerial under the starboard wing. Another important feature of the Griffon-engine Spitfires was the entirely flush-riveted finish which was progressively introduced on all Spitfires.
The Model 12 variants—12-1, 12-2, and 12-3—used a narrower hammer [4] and had an aluminum grip frame that was 0.08-inch (2.0 mm) narrower than the standard steel K-frame. [1] The final version, the Model 12-4, used the standard frame dimension [5] of the other K-frames. It also featured a rounded butt. Pre-Model 12: predates model number ...
The basic F.37/34 (as Spitfire was still then known) wing and undercarriage were mated to a modified fuselage which provided room for a gunner and a remote control four-gun turret (originally armed with .303 Brownings, later with Lewis light machine guns.) Other modifications included a cooling system mounted in a chin radiator housing.
The wreckage was later exported to the United Kingdom, rebuilt as a high-back Spitfire, re-registered as G-PBIX and flew again in 2013 in No. 322 (Dutch) Squadron markings of 3W-P. [187] RW382 was repainted in 2020 as a Spitfire (WZ-RR) from 309th Fighter Squadron USAAF flown by Lieutenant Robert Conner in Italy 1944.
As an aircraft to succeed the Hurricane and Spitfire then entering service, Air Ministry specification F.18/37 required a 400+ mph (at 15,000 ft) fighter with twelve .303 inch machine gun armament. Hawker Aircraft submitted a single seat, single engine design with two possible engines, the Hawker Tornado powered by the Rolls-Royce Vulture and ...
Starting in March 1944, the Merlin 66-powered Spitfire IXs of two Air Defence of Great Britain (ADGB) squadrons were cleared to use the new fuel for operational trials, and it was put to good use in the summer of 1944 when it enabled Spitfire L.F. Mk. IXs to intercept V-1 flying bombs coming in at low altitudes.