Keystone XLB-12

The Keystone XLB-12 was the designation given to the first LB-7 light bomber after it had been re-engined with Pratt & Whitney R-1860-1 radial engines. These engines were 50hp more powerful than the Pratt & Whitney R-1690-3 radials used in the standard LB-7, but the performance of the aircraft was barely affected. The XLB-12 was used as a flying test bed for the R-1860 engine, and no production order followed. However a later version of the same engine was used to power the Keystone B-4A of 1932.

Engine: Two Pratt & Whitney R-1860-1 radial engines
Power: 575hp
Crew: 5
Span: 75ft 0in
Length: 49ft 3in
Height: 18ft 1in
Empty Weight:
Gross Weight: 13,050lb
Maximum Speed: 116mph at sea level
Cruising Speed: 95mph
Ceiling: 11,650ft
Range: 632 miles with 2,000lb bomb load
Guns: Five 0.30in calibre machine guns
Bomb load: 2,000lb

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How to cite this article: Rickard, J (8 October 2008), Keystone XLB-12 ,

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