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Pratt & Whitney X-1800 : ウィキペディア英語版
Pratt & Whitney X-1800

The Pratt & Whitney X-1800 (later enlarged as the XH-2600) was an H-block aircraft engine project developed between 1938 and 1940, which was cancelled with only one example being built.
==Design and development==

The X-1800 was a watercooled 24-cylinder H-block of 2,240 in3 displacement;〔Gunston 2006, p. 163.〕 this was later expanded to 2,600 in3 displacement.〔Connors, p. 147.〕 It was intended to be used in the Vultee XP-54, Curtiss-Wright XP-55 Ascender, Northrop XP-56, and Lockheed XP-49. Projected performance was to be 1,800 to 2,200 hp (1350-1640 kW), with a turbocharger to secure high-altitude performance. The designation came from the intended power rating rather than the more usual cubic inch engine displacement figure.〔Gunston 2000〕
The target date for series production was 1942. In 1940, however, performance on the test bench did not continue to improve, demonstrating a need for considerable additional development effort. Pratt & Whitney subsequently ended development of the X-1800 in October 1940, with only one built, to concentrate on radial engines.

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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