Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Wright R-790 Whirlwind was a series of nine-cylinder air-cooled radial aircraft engines built by Wright Aeronautical Corporation, all of which had a displacement of about 790 in (12.9 L) and around 200 hp (150 kW). These engines were the earliest members of the Wright Whirlwind engine family.The R-790 Whirlwind began as the Lawrance J-1, a nine-cylinder air-cooled radial developed in 1921 by the Lawrance Aero Engine Company for the U.S. Navy. The Navy was very enthusiastic about air-cooled engines, which it felt were better suited for naval use than liquid-cooled ones.

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