Keystone LB-6 "Panther"
Model Airplane News Cover Art for December, 1966
by Jo Kotula
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The Keystone LB-6 was an 1920s American 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.

  

Photos of the Keystone LB-6 "Panther"
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The LB-6 was the first operational service model of a 13,000 lb 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. 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 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.

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