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Posted 6/25/2009 Printable Fact Sheet
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Douglas Y1B-7
Douglas Y1B-7 with camouflaged paint scheme, taken March 28, 1933. (U.S. Air Force photo)
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The U.S. Army ordered seven improved XB-7s as Y1B-7 for service testing. The new aircraft were fitted with improved Curtiss Conqueror engines with 75 more hp each. These engines were fitted with three-blade propellers also. Additionally, the corrugated fuselage skin of the XB-7 was replaced with smooth skin for the service test aircraft. These features combined to give the Y1B-7 a top speed of 182 mph, 13 mph faster than the XB-7.

The Y1B-7 was evaluated, but never entered quantity production. This was mainly due to the small bomb load and the better aircraft already being designed (i.e. Martin B-10).

Type Number built/
Y1B-7 7 Service test XB-7

Armament: Two Browning .30-cal. machine guns and 1,200 lbs. of bombs
Engines: Two Curtiss V-1570-27 Conquerors of 675 hp each
Top speed: 182 mph at sea level
Cruising speed: 158 mph
Service ceiling: 20,400 ft.
Range: Approx. 600 miles (400 with full bomb load)
Span: 65 ft. 3 in.
Length: 45 ft. 7 in.
Height: 12 ft. 1 in.
Weight: 11,177 lbs. gross
Crew: Four
Serial numbers: 32-308 to 32-314

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