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XP-55 Ascender : ウィキペディア英語版
Curtiss-Wright XP-55 Ascender

The Curtiss-Wright XP-55 Ascender (company designation CW-24) was a 1940s United States prototype fighter aircraft built by Curtiss-Wright. Along with the Vultee XP-54 and Northrop XP-56, it resulted from United States Army Air Corps proposal R-40C issued on 27 November 1939 for aircraft with improved performance, armament and pilot visibility over existing fighters; it specifically allowed for unconventional aircraft designs. A highly unusual design for its time, it had a canard configuration, a rear mounted engine, swept wings and two vertical tails. Because of its pusher design, it was sarcastically referred to as the "Ass-ender".〔Jenkins 2008. p. 8.〕 Like the XP-54, the Ascender was initially designed for the Pratt & Whitney X-1800 engine and had to be redesigned when that engine project was cancelled. It was also the first Curtiss fighter aircraft to use tricycle landing gear.
==Design and development==

On 22 June 1940, the Curtiss-Wright company received an Army contract for preliminary engineering data and a powered wind tunnel model. The designation P-55 was reserved for the project. The USAAC was not completely satisfied with the results of these tests, and Curtiss-Wright took it upon itself to build a flying full-scale model which it designated CW-24B. The flying testbed was powered by a Menasco C68-5 inline engine. It had a fabric-covered, welded steel tube fuselage with a wooden wing. The undercarriage was non-retractable.
On 10 July 1942, the United States Army Air Forces issued a contract for three prototypes under the designation XP-55. Serial numbers were 42-78845 through 42-78847. During this time, the Pratt & Whitney X-1800 H-block sleeve valve engine was experiencing serious developmental delays, and was eventually cancelled. Curtiss decided to switch to the Allison V-1710 (F16) liquid-cooled inline engine because of its proven reliability. Armament was to be two and two s. During the mock-up phase, it was decided to switch to the more powerful V-1710-95. The 20 mm cannons were also replaced by 0.50 in machine guns.
A special feature of the XP-55 was a propeller jettison lever located inside the cockpit to prevent the pilot from hitting the propeller during bailout.

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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