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The Curtiss XP-14 was to have been a fighter based around the Curtiss H-1640 Chieftain 12-cylinder air cooled double-row inline engine. Three prototypes of a Curtiss Hawk biplane powered by the Chieftain were ordered as the XP-11, but before they could be built it became clear that the engine had failed. The three XP-11s were completed with different engines, and the XP-14 was cancelled.