The Huff-Daland LB-1 was an improved version of the XLB-1. The LB-1 had a crew of four, one more than the XLB-1, and an improved Packard 2A-2540 engine. The LB-1 was named "Pegasus" by Huff-Daland but the name wasn't used by the Army Air Corps. Ten aircraft were ordered for service testing in 1925 and first flown in July 1927.
The LB-1 had about the same performance as the XLB-1, but carried a much larger bomb load of 2,750 pounds although the range was reduced by half. The LB-1 was the basis for the larger XHB-1 (Heavy Bomber), but the single-engine bomber was never seriously considered for production beyond the test phase. These aircraft were the last single-engine bombers ever tested by the Army (or the USAF).
Service test aircraft
TECHNICAL NOTES: Armament: Five .30-cal. machine guns and 2,750 lbs. of bombs Engine: One Packard 2A-2540 of 800 hp Maximum speed: 120 mph at sea level Cruising speed: 105 mph Service ceiling: 11,150 ft. Range: Approx. 430 miles (varied by bomb load) Span: 66 ft. 6 in. Length: 46 ft. 2 in. Height: 14 ft. 11 in. Weight: 12,415 lbs. gross Crew: Four Serial numbers: 26-376 to 26-385