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Douglas XTB2D Skypirate
The Douglas TB2D Skypirate (also known as the Devastator II) was a torpedo bomber intended for service with the United States Navy's ''Midway''- and ''Essex''-class aircraft carriers; it was too large for earlier decks. Two prototypes were completed, but the dedicated torpedo bomber was becoming an outdated concept, and with the end of World War II, the type was deemed unnecessary and cancelled.
==Design and development==
In 1939, Douglas designers Ed Heinemann and Bob Donovan began work on a VTB Proposal to replace the TBD Devastator torpedo bomber. In 1942, the team led by Heinemann and Donovan began work on a new project named the "Devastator II". On 31 October 1943, just four days after the new ''Midway'' class aircraft carriers were ordered into production, Douglas received a contract for two prototypes, designated TB2D, receiving the official name: "Skypirate".〔Baugher, Joe. ("Douglas XBT2D Dauntless II." ) ''US Attack Aircraft'' via ''joebaugher.com'', 24 October 2001. Retrieved: 7 June 2010.〕
The TB2D was powered by a Pratt & Whitney R-4360 Wasp Major driving contra-rotating propellers. Four torpedoes or an equivalent bomb load could be carried on underwing pylons. Defensive armament consisted of two 20 mm (.79 in) cannon in the wings and .50 in (12.7 mm) machine guns mounted in a power-operated dorsal turret.〔Kowalski 1996, pp. 32–33.〕
Very large for a single-engined aircraft, the TB2D would have been the largest carrierborne aircraft at the time; it could carry four times the weapon load of the Grumman TBF Avenger. With only limited support from the US Navy, and facing a recommendation for cancellation on 20 May 1944 due to the aircraft being designed only for the CVB and CV9 carriers, the TB2D project was in peril even at the design and mockup stage.〔("Memorandum: Cancellation of XTB2F Project - Recommendation for." ) ''Chief, BuAer, 20 May 1944''. Retrieved: 7 June 2010.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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