Keystone B-3

Keystone B-3A
[http://1000aircraftphotos.com/APS/3517L.jpg ]
Description
Rôle	Light bomber
Crew	5
First Flight
Entered Servise	1930
Manufacturer	Keystone Aircraft Corporation
Number built	63 B-3A
Dimensions
Length	48 ft 10 in	14.9 m
Wingspan	74 ft 8 in	22.8 m
Height	15 ft 9 in	4.8 m
Wing area	ft²	m²
Weights
Empty	lb	kg
Loaded	12,952 lb	5,875 kg
Maximum takeoff	lb	kg
Capacity
Powerplant
Engines	Pratt & Whitney R-1690-3 (2)
Power	525 hp	391 kW
Performance
Maximum speed (sea level)	114 mph	183.4 km/h
Cruising speed	98 mph	157.7 km/h
Combat range	860 miles	1,384 km
Ferry range	miles	km
Service ceiling	12,700 ft	3,871 m
Rate of climb	ft/min	m/min
Wing loading	lb/ft²	kg/m²
Power/Mass	.081 hp/lb	.06 kW/kg
Armament
Guns	Browning .30-calibre machine guns (3)
Bombs	2,500lb

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The Keystone B-3 was a bomber aircraft built for the US Army.

Originally ordered as the LB-10A, but the Army dropped the LB- 'light bomber' designation in 1930. The B-3A was very similar to all of its contemporaries; it had the same twin engine nacelles, the same biplane design, the same gunner turrets.

The B-3A was the last biplane disbanded by the Army; it remained in service until 1940. A few years after it was first produced, a revolution in airplane design rendered it almost completely obsolete.

Links

USAF Museum article on LB-10 (http://www.wpafb.af.mil/museum/research/bombers/b1-28.htm)
USAF Museum article on LB-10A (http://www.wpafb.af.mil/museum/research/bombers/b1-29.htm)
USAF Museum article on B-3A (http://www.wpafb.af.mil/museum/research/bombers/b1-43.htm)

Related content
Related Development	Keystone LB-10
Similar Aircraft
Designation Series	XB-1 - B-2 - B-3 - B-4 - B-5 - B-6
Related Lists	List of military aircraft of the United States - List of bomber aircraft

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