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The Keystone LB-6 was an 1920s Americanmarker light bomber built by the Keystone Aircraft company for the United States Army Air Corps. It was called the Panther by the company but adoption of the name was rejected by the U.S. Army.

The LB-6 was the first operational service model of a 13,000 lb (5,897 kg) twin-tail biplane bomber of a series produced by Keystone that included the follow-on LB-7 bomber. A number of variants were built for test and evaluation purposes but never placed into production or service.

Development

The LB-6 was an upgrade of the earlier triple-tailed Keystone LB-5 with revised extended-span wings and powered by two 525 hp (391 kW) Pratt & Whitney R-1690-3 Hornet engines strut-mounted between the wings. Other variants were built with differing engines.

The final two variants were ordered before the 1930 change of designators by the United States Army Air Corps from "LB-" (Light bomber) to "B-", but were delivered after the change. Although delivered as bombers, they saw service as cargo and observation aircraft.

XLB-12 protoype
XLB-12 port-side view


Variants

XLB-6
One LB-5 modified for evaluation.
LB-6
Production version, 17 built.
LB-7
LB-6 with 525 hp (391 kW) Pratt & Whitney R-1690 engines, 18 built.
LB-8
One LB-7 re-engined with 550 hp (410 kW) Pratt & Whitney R-1830 engines for evaluation.
LB-9
One LB-7 re-engined with 575 hp (429 kW) Wright GR-1750 engines for evaluation.
XLB-10
One LB-6 re-engined with 525 hp (391 kW) R-1690-3 engines.
LB-10
Production version of the XLB-10, 63 built, all redesignated B-3A prior to delivery. 36 built as B-3A with Pratt & Whitney engines; remaining 27 became B-5 with Wright engines.
LB-11
One LB-6 re-engined with 525 hp (391 kW) R-1750-3s for evaluation.
LB-11A
LB-11 re-engined with 525 hp (391 kW) GR-1750s for evaluation.
LB-12
Similar to the LB-7, with 575 hp (429 kW) R-1830-1s for evaluation.
LB-13
Seven aircraft delivered as the Y1B4-1 (5) and Y1B6-1 (2).
LB-14
Production version with 575 hp (429 kW) GR-1830 engines, three delivered as the Y1B5-1.


Operators



Specifications (B-4A)

See also

References

  • John Andrade. U.S.Military Aircraft Designations and Serials since 1909, p.135. Midland Counties Publications, 1979. ISBN 0 904597 22 9.
  • The Illustrated Encyclopedia of Aircraft (Part Work 1982-1985), p.2255. Orbis Publishing, 1985.



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