• Source: Keystone B-5

The 5.180.24.3/info/keystone" target="_blank">Keystone 5.180.24.3/info/b" target="_blank">B-5 is a light bomber made by the 5.180.24.3/info/keystone" target="_blank">Keystone Aircraft company for the United States Army Air Corps in the early 1930s. The 5.180.24.3/info/b" target="_blank">B-5A was a 5.180.24.3/info/keystone" target="_blank">Keystone 5.180.24.3/info/b" target="_blank">B-3A with Wright Cyclone rather than Pratt & Whitney engines.




Design and development


Three 5.180.24.3/info/b" target="_blank">B-3A (LB-10A) were reengined with Wright R-1750-3 radial engines and were redesignated Y1B-5. The Army Air Corps changed the design of the last 27 LB-10As on order, replacing the Pratt & Whitney R-1690 radial engines with the Wright R-1750-3. The Pratt & Whitney-powered aircraft were designated 5.180.24.3/info/b" target="_blank">B-3A, and the Wright-powered aircraft became 5.180.24.3/info/b" target="_blank">B-5A. They provided the backbone of the U.S. bomber force from then to 1934.




Operational history


5.180.24.3/info/b" target="_blank">B-5A were first line bombers of the United States for the period between 1930 and 1934. Afterwards, they remained in service primarily as observation aircraft until the early 1940s.




Variants


LB-14
Designed as LB-10 with 575 hp (429 kW) Pratt & Whitney GR-1860 engines; three ordered, but redesigned with 525 hp (392 kW) Wright R-1750-3 engines and delivered as the Y1B-5.
Y1B-5
Three pre-production aircraft redesignated from LB-14 before delivery.
5.180.24.3/info/b" target="_blank">B-5A
Wright R-1750-3 version originally ordered as 5.180.24.3/info/b" target="_blank">B-3A, 27 built




Operators


United States
United States Army Air Corps




Specifications (5.180.24.3/info/b" target="_blank">B-5A)


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 sq ft (106.4 m2)
Empty weight: 7,705 lb (3,945 kg)
Gross weight: 12,952 lb (5,875 kg)
Powerplant: 2 × Wright R-1750-3 radial engines, 525 hp (392 kW) each
Performance

Maximum speed: 111 mph (179 km/h, 97 kn)
Cruise speed: 98 mph (160 km/h, 86 kn)
Range: 815 mi (1,310 km, 707 nmi)
Service ceiling: 14,000 ft (4,270 m)
Wing loading: 273.3 lb/sq ft (52.22 kg/m2)
Power/mass: 0.0810 hp/lb (133 W/kg)
Armament

Guns: 3 × .30 in (7.62 mm) Browning machine guns
Bombs: 2,500 lb (1,100 kg); 4,000 lb (1,800 kg) on short runs




See also



Related development

5.180.24.3/info/keystone" target="_blank">Keystone 5.180.24.3/info/b" target="_blank">B-3
5.180.24.3/info/keystone" target="_blank">Keystone 5.180.24.3/info/b" target="_blank">B-4
5.180.24.3/info/keystone" target="_blank">Keystone 5.180.24.3/info/b" target="_blank">B-6

Related lists

List of bomber aircraft
List of military aircraft of the United States




External links



USAF Museum article on 5.180.24.3/info/b" target="_blank">B-5
USAF Museum article on LB-14

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