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Posted 6/25/2009 Printable Fact Sheet
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Keystone LB-5
Keystone LB-5 in flight on Dec. 24, 1937. (U.S. Air Force photo)
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The LB-5 was an improved version of the XLB-5 used as service test aircraft. The most apparent difference between the two aircraft was the single tail on the XLB-5 and the triple vertical tail on the LB-5. Ten aircraft were ordered by the Air Corps in 1927 and used into the late 1930s, long after they were made obsolete by much more advanced aircraft.

The LB-5 was a very conservative design, not much different from the Martin NBS-1 of the early 1920s. The Air Corps leadership favored the twin-engine biplane bomber, and it would be another five years before a significantly improved bomber would appear in the Martin B-10.

Type Number built/
LB-5 10 Improved XLB-5

Armament: Five .30-cal. machine guns and 2,312 pounds of bombs
Engines: Two Liberty V-1650-3s of 420 hp each
Top speed: 107 mph at sea level
Service ceiling: 8,000 ft.
Range: 435 miles with full bomb load
Span: 67 ft.
Length: 44 ft. 8 in.
Height: 16 ft. 10 in.
Weight: 12,155 lbs. gross
Crew: Five
Serial numbers: 27-335 to 27-344

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