The XP-9, S/N 28-386, was Boeing's first attempt at building a single-wing pursuit aircraft. The XP-9 was unsuccessful as a pursuit aircraft mainly because poor handling characteristics and the aft placement of the cockpit restricted the pilot's forward visibility.
The primary contribution of the XP-9 was the semi-monocoque (structural framework with a stressed skin) construction method, which would become standard in later years.
Boeing Model 96
TECHNICAL NOTES: Armament: One .30-cal. and one .50-cal. machine gun Engine:Curtiss V-1570-15 Conqueror of 600 hp Maximum speed: 181 mph at sea level Cruising speed: 144 mph Service ceiling: 25,300 ft. Range: 425 mi. Length: 25 ft. 8 in.
Span: 36 ft. 7 in. Height: 7 ft. 9 in.
Maximum weight: 3,604 lbs. First flight: Nov. 18, 1930