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Posted 6/25/2009 Printable Fact Sheet
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Keystone XB-1B
The only Keystone XB-1B built (S/N 27-334). (U.S. Air Force photo)
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The Keystone XB-1B was the designation assigned to the Huff-Daland XB-1 after the original Packard 2A-1530 engines were replaced with Curtiss V-1570-5 Conqueror engines (Huff-Daland was reorganized and renamed Keystone in 1927 -- between the time the XB-1 was built and the XB-1B was modified). The XB-1A designation was skipped because it was already assigned to the Dayton-Wright XB-1A "Bristol Fighter."

The improved B aircraft had better performance than the original, but still didn't compare favorably to other aircraft of the period and never entered production. The performance of the Curtiss XB-2; for example, was significantly better than the XB-1B, but the Curtiss aircraft was initially rejected also; in part because it was too big to fit into existing hangars.

Type Number built/
XB-1B 1 (cv) XB-1 with new engines

Armament: Six .30-cal. machine guns and 2,500 lbs. of bombs (up to 4,000 lbs. for short distances)
Engines: Two Curtiss V-1570-5 Conqueror V-12s of 600 hp each
Top speed: 117 mph at sea level
Service ceiling: 15,000 ft.
Range: 700 miles with normal full bomb load of 2,500 lbs.
Span: 85 ft. 0 in.
Length: 62 ft. 0 in.
Height: 19 ft. 3 in.
Weight: 16,500 lbs. gross
Crew: Five
Serial number: 27-334

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