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Posted 6/25/2009 Printable Fact Sheet
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Keystone LB-8
Keystone LB-8 (S/N 29-9; XP-584), the only LB-8 built/converted. (U.S. Air Force photo)
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The Keystone LB-8 was the 17th Keystone LB-7 (S/N 29-9) re-engined with Pratt & Whitney GR-1860-3 radial engines of 550 hp each. The LB-8 had slightly better performance than the original LB-7 but never entered production.

The most significant feature tested on the LB-8 was the geared engine (2:1 ratio), which was designed to allow more efficient propeller operation combined with better engine performance.

Type Number built/
LB-8 1 (cv) 17th LB-7 with new engines

Armament: Five .30-cal. machine guns and 2,000 lbs. of bombs
Engines: Two Pratt & Whitney R-1860-3 radials of 550 hp each
Top speed: 126 mph at sea level
Cruising speed: 100 mph
Service ceiling: 16,800 ft.
Span: 75 ft. 0 in.
Length: 49 ft. 3 in.
Height: 18 ft. 1 in.
Weight: 13,745 lbs. gross
Crew: Five

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