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The XLB-3A was the designation for the XLB-3 after an engine change. The single aircraft built (S/N 27-333) initially had V-1410 inverted Liberty engines, but was modified to test Pratt & Whitney R-1340-1 Wasp radial engines. The Huff-Daland company was reorganized as Keystone while the aircraft was being modified, so the A model was known as the Keystone XLB-3A and the original as Huff-Daland XLB-3.
The Air Corps purchased a small number of Keystone LB-5 and LB-5A aircraft instead of the XLB-3A which never advanced past the prototype test phase. Like the early pursuit aircraft, the Air Corps assigned new model numbers and sometimes entirely new designations to very similar aircraft. All the Keystone Light Bombers (LB) with the exception of the single engine LB-1 were named using this scheme. In fact, the XLB-3 was essentially an LB-1 redesigned for two engines.
||XLB-3 with radial engines
Armament: Five .30-cal. machine guns and approx. 2,200 lbs. of bombs
Engines: Two Pratt & Whitney R-1340s Wasp radials of 410 hp each
Maximum speed: 116 mph at sea level
Service ceiling: 11,200 ft.
Range: Approx. 550 miles with full bomb load
Span: 66 ft. 6 in.
Length: 45 ft. 0 in.
Height: 16 ft. 10 in.
Weight: 11,682 lbs. gross
Serial number: 27-333 (with new engines)
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