The Boeing B-17B was an improved version of the B-17A. The major changes in the B model included a larger rudder, a larger set of flaps and a redesigned nose. The nose-mounted turret was replaced by a Plexiglas nose making the B-17B about seven inches shorter than the A. The Army Air Corps ordered 39 B-17Bs in 1938-1939.
In October 1942 the B-17Bs were redesignated as RB-17B (R for restricted). These aircraft were used for non-combat training, transport, messenger and liaison duties.
Note: Boeing Model 299M; became RB-17B in October 1942.
TECHNICAL NOTES: Armament: One .30-cal. and six .50-cal.) machine guns and four 1,100-lb. bombs Engines: Four Wright R-1820-51 turbo-supercharged radials of 1,000 hp each Maximum speed: 292 mph at 25,000 ft. Cruising speed: 181 mph Service ceiling: 36,000 ft. Range: 3,600 miles (maximum ferry range) Span: 103 ft. 9 in. Length: 67 ft. 11 in. Height: 15 ft. 0 in. Weight: 38,000 lbs. design gross weight Serial numbers: 38-211 to 223; 38-258 to 38-270; 38-583 to 38-584; 38-610; 39-1 to 39-10