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Posted 11/30/2006 Printable Fact Sheet
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Boeing Y1B-17A
Boeing Y1B-17A in flight near Mt. Rainier on Feb. 28, 1938. (U.S. Air Force photo)
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The Boeing Model 299F was originally ordered as a static test bed; however, it was converted to a flight capable aircraft for testing supercharged engines. This converted aircraft was designated Y1B-17A and was one of a kind. A variety of engine installations and configurations eventually led to the bottom-mounted turbo-supercharger, which became standard on the B-17B -- the first production model of the B-17 series of bombers. The turbo-superchargers allowed the aircraft to fly higher and faster than the non-supercharged YB-17. Once testing was complete, the Y1B-17A became the B-17A.

Type Number built/
Y1B-17A 1 Supercharged engine test aircraft

Serial number: 37-369
Notes: Boeing Model 299F originally ordered as a static test aircraft; became B-17A after completion of testing

103 ft. 9 in.
Length: 68 ft. 9 in.
Height: 15 ft. 0 in.
Weight: 37,000 lbs. gross
Armament: Five .30-cal. (or .50-cal.) machine guns and eight 600-lb. bombs
Engines: Four Wright R-1820-51 turbo-supercharged radials of 1000 hp each

Maximum speed: 295 mph at 25,000 ft.
Cruising speed: 183 mph
Service ceiling: 38,000 ft.
Range: 3,600 miles (maximum ferry range)

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