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Keystone B-3The Keystone B-3 was a bomber aircraft developed for the United States Army Air Corps in the late 1920s. It was originally ordered as the LB-10A (a single-tail modification of the Keystone LB-6), but the Army dropped the LB- 'light bomber' designation in 1930. Though the performance of the B-3 was hardly better than that of the bombers flown at the end of World War I, it had come a long way. In terms of its safety, it was far superior to its oldest predecessors. 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. Units using the B-3 - 4th Composite Group
- 6th Composite Group
- 19th Bombardment Group
Specifications (B-3A) General Characteristics - Crew: 5
- 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: 1,145 ft² (106.4 m²)
- Empty: 7,705 lb (3,495 kg)
- Loaded: 12,952 lb (5,875 kg)
- Maximum takeoff: lb ( kg)
- Powerplant: 2× Pratt & Whitney R-1690-3 of 525 hp (392 kW) each
Performance - Maximum speed: 114 mph (183 km/h)
- Cruising speed: 98 mph (158 km/h)
- Range: 860 miles (1,400 km)
- Service ceiling: 12,700 ft (3,870 m)
- Rate of climb: 530 ft/min (160 m/min)
- Wing loading: 11.31 lb/ft² (55.42 kg/m²)
- Power/Mass: 0.0811 hp/lb (0.133 kW/kg)
Armament - Guns: 3× .30-calibre (7.62 mm) Browning machine guns
- Bombs: 2,500 lb (1,100 kg); 4,000 lb (1,800 kg) on short runs
Related Content Related development: Keystone B-4 - Keystone B-5 - Keystone B-6 Comparable aircraft: Keystone B-4 - Keystone B-5 - Keystone B-6 Designation sequence: XB-1 - B-2 - B-3 - B-4 - B-5 - B-6 -
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- LB-7 - LB-8 - LB-9 - LB-10 - LB-11 - XLB-12 - LB-13
Related Lists: List of military aircraft of the United States - List of bomber aircraft Links B-03, Keystone
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