Keystone B-3 - Variants

Variants

LB-10

The last of the 17 LB-6s ordered (S/N 29-27) was converted with a re-designed single fin and rudder and two 525 hp R-1750E engines. Delivered to Wright Field on 7 July 1929, it was wrecked on 12 November 1929.

LB-10A

This version used Pratt and Whitney R-1690-3 Hornet engines and was slightly smaller, both wingspan and fuselage. a total of 63 were ordered (S/N 30-281/343). It was re-designated as the B-3A before any deliveries were made, and the final 27 were built as B-5A.

B-3A

36 delivered as B-3A (S/N 30-281/316). The first aircraft was delivered in October 1930.

B-5A

Ordered as B-3A, re-engined with Wright R-1750-3 Cyclone engines, 27 built (S/N 30-317/343).