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The Keystone LB-11 was the designation given to the second-to-last LB-6 while it was being used as an engine test-bed. At first the LB-11 was used to test the standard Wright R-1750-3 Cyclone, a very similar engine to the R-1750-1 used in the LB-6. It was then used to test geared Wright G1R-1750 radial engines, with a gear ratio of 2:1 and was given the designation LB-11A.
All three engines provided the same 525hp, and all three versions of the aircraft (LB-6, LB-11 and LB-11A) had very similar performance figures. At the end of the engine tests the LB-11A was turned back into a standard LB-6 by installing the original R-1750-1 engines, and returned to operational service.
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LB-11 and LB-11A |
Engine |
Wright R-1750-3 Cyclones |
Power |
525hp |
Crew |
5 |
Span |
75ft 0in |
Length |
49ft 3in |
Height |
18ft 1in |
Gross Weight |
13,000lb |
Maximum Speed |
115mph at sea level |
Cruising Speed |
95mph |
Ceiling |
11,650ft |
Range |
632 miles with full bomb load |
Guns |
Five 0.30in machine guns |
Bomb load |
2,000lb |