<!-- This article is a part of Wikipedia:WikiProject Aircraft. Please see Wikipedia:WikiProject Aircraft/page content for recommended layout. -->

The Keystone B-5 is a light bomber made by the Keystone Aircraft company for the United States Army Air Corps in the early 1930s. The B-5A was a Keystone B-3A with Wright Cyclone rather than Pratt & Whitney engines.

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.

Operational history

B-5A were first line bombers of the United States for the period between 1930 and 1934. Afterwards, they remained in service primarily as observation aircraft until the early 1940s.

Variants

;LB-14

:Designed as LB-10 with 575&nbsp;hp (429&nbsp;kW) Pratt & Whitney GR-1860 engines; three ordered, but redesigned with 525&nbsp;hp (392&nbsp;kW) Wright R-1750-3 engines and delivered as the Y1B-5.

;Y1B-5

:Three pre-production aircraft redesignated from LB-14 before delivery.

;B-5A

:Wright R-1750-3 version originally ordered as B-3A, 27 built

Operators

;

  • United States Army Air Corps

Specifications (B-5A)

See also

  • USAF Museum article on B-5
  • USAF Museum article on LB-14