R-1830 vs. Allison V-1710 (1 Viewer)

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Ir was figured that the P-40 had 22% less drag than the P-36. That Explains the the higher speed with equivalent engines and the push for liquid cooled engines, but since technology doesn't stand still later air-cooled engine installations cut into that margin quite a bit. The people in charge of ordering planes could only go with what was known at the time, not what would become known in 2-3 years.
 

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