Keystone B-5

B-5

Keystone B-5A
Role	Light bomber
Manufacturer	Keystone Aircraft
Primary user	United States Army Air Corps
Number built	3 Y1B-5 27 B-5A
Developed from	Keystone B-3

The Keystone B-5 was a light bomber made for the United States Army Air Corps in the early 1930s. The B-5A was a Keystone B-3A with Wright Cyclone rather than Pratt & Whitney engines.

Design and development

Three 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 B-3A, and the Wright-powered aircraft became B-5A. They provided the backbone of the U.S. bomber force from then to 1934.

Operational history

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.
B-5A: Wright R-1750-3 version originally ordered as B-3A, 27 built

Operators

United States

United States Army Air Corps

Specifications (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 ft² (106.4 m²)
Empty weight: 7,705 lb (3,945 kg)
Loaded weight: 12,952 lb (5,875 kg)
Max. takeoff weight: lb (kg)
Powerplant: 2 × Wright R-1750-3 radial engines, 525 hp (392 kW) each

Performance

Maximum speed: 111 mph (97 kn, 179 km/h)
Cruise speed: 98 mph (86 kn, 160 km/h)
Range: 815 mi (707 nmi, 1,310 km)
Service ceiling: 14,000 ft (4,270 m)
Wing loading: 273.3 lb/f² (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

External links

Wikimedia Commons has media related to Keystone B-5.

Aircraft produced by Huff-Daland Aero, Keystone Aircraft, and Keystone-Loening

Manufacturer designations	K-47 K-55 K-78 K-84 K-85 Air Yacht Commuter Pathfinder Pronto

Bombers	LB-1 XLB-3 LB-5 LB-6 LB-7 LB-8 LB-9 LB-10 LB-11 LB-12 LB-13 LB-14 XB-1 B-3 B-4 B-5 B-6

Trainers	TA-6 TW-5 AT-1 AT-2 NK

Patrol aircraft	PK

USAAS/USAAC/USAAF/USAF bomber designations, Army/Air Force and Tri-Service systems

Original sequences
(1924-1930)

Light Bomber	LB-1 LB-2 LB-3 LB-4 LB-5 LB-6 LB-7 LB-8 LB-9 LB-10 LB-11 LB-12 LB-13 LB-14

Medium Bomber	B-1 B-2

Heavy Bomber	HB-1 HB-2 HB-3

Main sequence
(1930-1962)

B-1
B-2
B-3
B-4
B-5
B-6
B-7
B-8
B-9
B-10
B-11
B-12
B-13
B-14
B-15
B-16
B-17
B-18
B-19
B-20
B-21
B-22
B-23
B-24
B-25
B-26
B-27
B-28
B-29
B-30
B-31
B-32
B-33
B-34
B-35
B-36
B-37
B-38
B-39
B-40
B-41
B-42
B-43
B-44
B-45
B-46
B-47
B-48
B-49
B-50
B-51
B-52
B-53
B-54
B-55
B-56
B-57
B-58
B-59
B-60
B-61
B-62
B-63
B-64
B-65
B-66
B-67
B-68
RB-69
B-70

Long-range Bomber
(1935-1936)

Oddities

Redesignated A-series	B-20 B-26

'FB-' designations	FB-111 FB-22

Tri-Service sequence
(1962-current)

See also: SR-71 (designation in bomber sequence)
Next-Generation Bomber ("B-3")
2037 Bomber

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