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Keystone B-5
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==Design and development== Three B-3A (LB-10A) were reengined with [[Wright R-1750-3]] radial engines and were redesignated Y1B-5. The Army Air Corps changed the design of the last 27 LB-10As on order, replacing the [[Pratt & Whitney R-1690]] radial engines with the Wright R-1750-3. The Pratt & Whitney-powered aircraft were designated B-3A, and the Wright-powered aircraft became B-5A. They provided the backbone of the U.S. bomber force from then to [[1934 in aviation|1934]].
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