Production. A-31 ("Vengeance") dive bombers. Oil tank installation. Vultee workers are shown installing an oil tank behind the engine firewall on the sub-assembly engine mounting. This Wright "double cyclone" engine powers the "Vengeance" dive bomber made at Vultee's Nashville Division. 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