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Home > Fact Sheets > Keystone LB-13


Posted 6/25/2009 Printable Fact Sheet

The Keystone LB-13 was a modification of the LB-10A (B-3A) replacing the Pratt & Whitney R-1690-3 radials with GR-1690 geared radial engines. Before construction began on the LB-13s, the order was changed for five Y1B-4s with Pratt and Whitney R-1860-7 radial engines and two Y1B-6s with Wright R-1820-1 engines. All of these variations were essentially Keystone LB-10As with different engines.

The Light Bomber (LB) designation was dropped in 1930 and all LB aircraft in service were renamed using the standard Bomber (B) scheme.

Type Number built/
LB-13 7 (0 as LB-13) Built as Y1B-4 and Y1B-6

TECHNICAL NOTES (as designed):
Armament: Five .30-cal. machine guns and 2,000 lbs. of bombs
Engines: Two Pratt & Whitney GR-1690 radials of 525 hp each
Span: 74 ft. 9 in.
48 ft. 10 in.
Height: 15 ft. 9 in.
Weight: 13,000 lbs. gross
Crew: Five
Serial number: 32-117 to 32-141 

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