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An improved version of the Allison V-1710 engine gave rise to the Curtiss H-87, which began life in 1941 as the P-40D and featured a completely redesigned fuselage. The shorter and deeper nose of the new fighter gave it a decidedly snub-nosed appearance compared to the earlier P-40 models. Curtiss continued to tweak the H-87 for the next two years in the search for better performance, but the last major version, the P-40N, was only marginally faster than the first. In the process, Curtiss even tried an engine change to the Packard Merlin in the P-40F and L but to no avail. What the late mod

P-40 (Fighter plane)