| X-1800 (XH-2600) | |
|---|---|
 | |
| Type | 24-cylinder H-engine |
| National origin | United States |
| Manufacturer | Pratt & Whitney |
| First run | 1940 |
| Number built | 1 |
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.
The X-1800 was a watercooled 24-cylinder H-block of 2,240 in3 displacement; [1] this was later expanded to 2,600 in3 displacement. [2] It was intended to be used in the Vultee XP-54, Curtiss-Wright XP-55 Ascender, Northrop XP-56, Lockheed XP-49, and Lockheed XP-58 Chain Lightning. 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. [3]
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.
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