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A Pratt & Whitney R-2800-39 18-cylinder radial airplane engine. First run in 1937, over 125,000 of these were built in all variants, and saw extensive service in World War II combat, then in civilian airplanes for years afterward.

A Pratt & Whitney R-2800-39 18-cylinder radial airplane engine. First run in 1937, over 125,000 of these were built in all variants, and saw extensive service in World War II combat, then in civilian airplanes for years afterward.

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