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The Keystone LB-9 was the last production LB-7 (S/N 29-10) modified for Wright Cyclone radial engines. Like the LB-8, the LB-9 was mainly used as a test aircraft for a geared engine; 1.58:1 in this case.
The Cyclone radials were the same basic type used on the LB-6 and the LB-9 was converted to the standard LB-6 configuration after testing was complete. The difference between the LB-6, -7, -8, -9, -11 and -12 was essentially just the engine used. The LB-10 (and -13, -14) was based on the LB-6 and became the Keystone B-3A after the LB designation was dropped.
||Last LB-7 with new engines
Armament: Five .30-cal. machine guns and 2,000 lbs. of bombs
Engines: Two Wright GR-1750B Cyclone radials of 575 hp each
Top speed: 118 mph at sea level
Cruising speed: 95 mph
Service ceiling: 14,800 ft.
Span: 75 ft. 0 in.
Length: 49 ft. 3 in.
Height: 18 ft. 1 in.
Weight: 13,100 lbs. gross
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