The Keystone B-5 is a light bomber made by the

Keystone Aircraft Keystone Aircraft Corporation was an early American airplane manufacturer. History Headquartered in Bristol, Pennsylvania, the company was formed as "Ogdensburg Aeroway Corp" in 1920 by Thomas Huff and Elliot Daland, but its name was quickly ...

company for the

United States Army Air Corps The United States Army Air Corps (USAAC) was the aerial warfare service component of the United States Army between 1926 and 1941. After World War I, as early aviation became an increasingly important part of modern warfare, a philosophical r ...

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 The Pratt & Whitney R-1690 Hornet was a widely used American aircraft engine. Developed by Pratt & Whitney, 2,944 were produced from 1926 through 1942. It first flew in 1927. It was a single-row, 9-cylinder air-cooled radial design. Displacem ...

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 Events January–February * January 1 – The International Telecommunication Union, a specialist agency of the League of Nations, is established. * January 15 – The 8.0 1934 Nepal–Bihar earthquake, Nepal–Bihar earthquake strik ...

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 hp (429 kW) Pratt & Whitney GR-1860 engines; three ordered, but redesigned with 525 hp (392 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

; *

Specifications (B-5A)

External links

USAF Museum article on B-5
{{USAF bomber aircraft

B-5 B5, B05, B-5 may refer to: Biology * ATC code B05 (''Blood substitutes and perfusion solutions''), a therapeutic subgroup of the Anatomical Therapeutic Chemical Classification System * Cytochrome ''b''5, ubiquitous electron transport hemoprotein ...