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| Keystone B-4
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|
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| Description
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| Rôle | Light bomber
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| Crew | 5
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| First Flight |
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| Entered Service | 1932
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| Manufacturer | Keystone Aircraft Corporation
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| Number built | 5 Y1B-4, 25 B-4A
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| Dimensions
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| Length | 48 ft 10 in | 14.9 m
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| Wingspan | 74 ft 8 in | 22.7 m
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| Height | 15 ft 9 in | 4.8 m
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| Wing area | ft² | m²
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| Weights
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| Empty | lb | kg
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| Loaded | 13,000 lb | 5,897 kg
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| Maximum takeoff | lb | kg
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| Capacity |
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| Powerplant
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| Engines | Pratt & Whitney R-1860-7 radials (2)
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| Power | 575 hp | 429 kW
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| Performance
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| Maximum speed (sea level) | 130 mph | 209.2 km/h
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| Cruising speed | 103 mph | 165.7 km/h
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| Combat range | 850 miles | 1,367 km
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| Ferry range | miles | km
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| Service ceiling | 14,000 ft | 4,267 m
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| Rate of climb | ft/min | m/min
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| Wing loading | lb/ft² | kg/m²
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| Power/Mass | .044 hp/lb | .073 kW/kg
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| Armament
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| Guns | Browning .30-calibre machine guns (3)
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| Bombs | 2,500lb
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The Keystone B-4 was a biplane bomber originally ordered by the US Army as the LB-13. When the LB- designation was dropped in 1930, the first five planes were renamed Y1B-4s (the last two of the seven were named Y1B-6s). The Y1B- designation indicates that funds for the design did not come from the normal annual funds.
Because of more powerful engines, the performance of the Y1B-4 was a slight improvement on the B-3, but the planes were overall nearly identical.
In 1932, the army ordered 25 improved Y1B-4s as the Keystone B-4A. This production version (along with the B-6) was the last biplane bomber ordered from Keystone Aircraft
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