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Keystone Aircraft Corp LB-6 / LB-7

The Keystone LB series had been characterized by tapered wings, but the XLB-6 of 1927 (converted from the tenth LB-5) introduced constant-chord wings with new powerplant (two 525-hp Wright R-1750-1 Cyclone radials) mounted between the wings, and a lengthened fuselage. Thus modified, this became the standard configuration for the remaining Keystone LB types, beginning with 17 production LB-6s and continuing with 18 LB-7s, which were identical except for their 525-hp Pratt & Whitney R-1690-3 Hornet engines.

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