In support of an official event 

The Museum will be closed Sunday, May 25
In addition, the Fourth Hangar will be closed Saturday, May 24

Access to the Presidential Gallery will be limited from May 15 to June 5
 

Boeing YB-9

The YB-9 was originally owned, developed and tested by Boeing as the XB-901 (NX10633). The plane was based on the Model 200 commercial transport but was enlarged and adapted to the bomber role. The YB-9 was powered by two Pratt & Whitney R-1860 radial engines which gave it a top speed of 163 mph. Later in its service life, the YB-9 was fitted with the same engines powering the Y1B-9A service test aircraft bringing its top speed to 188 mph; as fast as the U.S. Army pursuit planes of the time.

A total of seven aircraft were built: the prototype YB-9, a liquid-cooled engine Y1B-9, and five service test Y1B-9As. The aircraft never entered production mainly because there were even better aircraft being designed which would change the course of U.S. bomber development.


Type Number built/
converted
Remarks
YB-9 1 Boeing XB-901


TECHNICAL NOTES:
Armament: Two .30-cal. machine guns and 2,200 lbs. of bombs
Engines: Two Pratt & Whitney R-1860 radials of 575 hp each
Top speed: 163 mph at sea level
Cruising speed: 137 mph
Service ceiling: 19,400 ft.
Range: Approx. 500 miles with a full normal bomb load
Span: 76 ft. 9 in.
Length:
51 ft. 6 in.
Height: 12 ft. 8 in.
Weight:
12,663 lbs. gross
Crew: Four
Serial numbers: 32-301 (originally Boeing-owned NX10633, XB-901 Model 215)

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