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The designation Curtiss P-36B was temporarily given to a single P-36A that was used to test 8:1 supercharger gearing. In November 1938 P-36A 38-20 was given a Wright R-1830-25 engine in place of its normal Pratt & Whitney R-1820, and was used to test the new engine. After a short period serving as an engine test-bed the original engine was replaced, and the aircraft reverted to its original designation.