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Berliner-Joyce F2J : ウィキペディア英語版 | Berliner-Joyce F2J
The Berliner-Joyce XF2J was the company's second biplane fighter for the US Navy. The XF2J was ordered on 30 June 1931 and although designated as a two-seat fighter, it was used as an observation aircraft. ==Design and Development== The XF2J's construction was all-metal with a fabric covered rudder. The upper wing was "gulled", with a short, sharply upward-angled section, with the remainder of the wing with a slight dihedral. The lower wing span was shorter than the upper wing, and was braced with "N" struts and wires. A .30 caliber machine gun was located in each of the gulled sections of the upper wing and were synchronized to fire through the propeller arc.〔Forgotten Fighters p 56〕 The tightly-cowled 9-cylinder Pratt & Whitney R-1690C "Hornet" was the engine originally specified, but was changed to the 14-cylinder Wright SR-1510-92 Whirlwind before the aircraft flew. The propeller was a metal constant speed two-blade design.〔 The original open cockpits were modified to sliding canopies shortly after delivery to the navy.〔
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