Production. A-31 ("Vengeance") dive bombers. Motor installation. A high angle view of a group of workers installing the motor on a Vultee "Vengeance" dive bomber at the Nashville Division of Vultee Aircraft Inc. Note that the inner wings are ready to be attached at this point. The "Vengeance" (A-31) was originally designed for the French. It was later adopted by the RAF (Royal Air Force) and still later by the U.S. Army Air Forces. It is a single-engine, low-wing plane, carrying a crew of two men and having six machine guns of varying calibers