The R-790, rated at 225 hp. , was a standard radial engine used by the Air Corps in several types of airplanes during the 1920s and 1930s. The civilian version of the R-790, designated the Wright J-5 "Whirlwind", was used to power the Spirit of St. Louis flown by Charles A. Lindbergh from New York to Paris in 1927.

Credits - U.S. Air Force Museum