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The Keystone LB-8 was the designation given to the seventeenth LB-7 light bomber after it was given Pratt & Whitney R-1860-3 radial engines. These were geared engines, with a 2:1 ratio, and were more efficient than the direct-drive engines used on the LB-7. The LB-8 was 12mph faster than the LB-7, and had a service ceiling of 16,800ft, over 5,000ft higher than that of the LB-7. Originally designated as the experimental XLB-8, the aircraft was later redesignated as the LB-8.
Engine: Two Pratt & Whitney GR-1860-3 radial engines
Power: 550hp
Crew: 5
Span: 75ft 0in
Length: 49ft 3in
Height: 18ft 1in
Gross Weight: 13,745lb
Maximum Speed: 126mph at sea level
Cruising Speed: 100mph
Ceiling: 16,800ft
Guns: Five 0.30in calibre machine guns
Bomb load: 2,000lb