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The P-39C was the first production version of the Airacobra, although only twenty aircraft were produced before production moved on to the P-39D. The P-39C was powered by the Allison V-1710-35 (E4) engine, and was armed with the standard 37mm T9 nose-mounted cannon. It differed from most P-39 Airacobras in that the secondary armament was provided by two .30in and two .50in machine guns mounted in the nose, with no wing-mounted guns.
The first P-39C made its maiden flight in January 1941, and by March 1941 all twenty aircraft had reached the 31st Pursuit Group. Having been hyped as a high speed fighter, the actual performance of the P-39C came as something of a disappointment. It was also felt to be under-armoured for a ground-support aircraft.
In the summer of 1941 three of the P-39Cs were sent to Britain to undergo tests with the RAF, with the first test flight taking place on 6 July 1941. These tests revealed that the P-39C had a top speed of 359mph, much lower than the 392mph achieved by the superturbocharged XP-39 and used in Bell publicity.
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