Boeing XB-38 Flying Fortress Boeing XB-38 Flying Fortress The XB-38 Flying Fortress was a single example conversion of a production B-17E Flying Fortress, testing whether the Allison V-1710 V type engine could be substituted for the standard Wright R-1820 radial engine during early World War II. The XB-38 was the result of a modification project undertaken by Boeing and Vega (a subsidiary of Lockheed) on a B-17 Flying Fortress to fit it with liquid-cooled Allison V-1710-89 Vee engine. It was meant as an improved version of the B-17, and a variant that could be used if air-cooled Wright R-1820 radial engines became scarce. Completing
RAF Bomber Command aircrew of World War II some air gunners were commissioned officers of which a small number were considerably older than most aircrew and even veterans of World War I. An Air Gunner wore a single-winged aircrew brevet with a wreath containing the letters AG on his tunic, above his left breast pocket denoting his trade specialization and very early in the war might also have the brass "winged bullet" qualification badge of a pre-war air gunner on his sleeve. Typically when flying operationally the following aircraft were crewed as below: Fairey Battle single-engined light bomber – most often used in daylight operations in a ground