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Engineering Division, Bureau of Aircraft Production TP-1 / XCO-5

The Engineering Division TP-1 was a two-seat biplane fighter designed by Alfred V. Verville and Virginius E. Clark at the United States Army Air Corps Engineering Division.
The prototype TP-1 was built as the XTP-1 AS68578 and tested at McCook Field in 1923. A biplane, the upper wing had a smaller span and narrower chord than the lower wing. The XTP-1 was armed with five .30 in (7.62 mm) machine guns and fitted with a 423 hp (315 kW) Liberty 12 engine. It was damaged in testing and scrapped.
A second prototype, AS68579, was completed as an observation/reconnaissance aircraft with new wings, with the designation XCO-5
The XCO-5 needed a high-lift wing suitable for high-altitude work. New wings were prepared. The aerofoil was Joukowsky StAe-27A, a heavily cambered wingshape with a thick leading edge. The upper and lower wings had a pronounced stagger, with a total wing area of 600 sq.ft. As well as lining and insulating the cockpit, heat was taken from the engine exhaust. A cover over the top of the cockpit kept the heat in; a clear panel in the cover allowed the pilot to see his instruments.
On October 10, 1928, Bill Streett and Albert William Stevens achieved an unofficial altitude record in the XCO-5 for aircraft carrying more than one person: 37,854 ft (11,538 m); less than 1,000 ft (300 m) short of the official single-person altitude record. At that height they measured a temperature of −78 °F (−61 °C), cold enough to freeze the aircraft controls. With frozen controls, Streett was unable to reduce altitude or to turn off the engine until some 20 minutes later when it ran out of fuel, after which he piloted the fragile experimental biplane down in a gentle glide and made a deadstick landing.
Engine: 1 × Liberty L-12A, 423 hp (315 kW)
Wingspan: 36 ft 0 in (10.97 m)
Wing area: 375 sq ft (34.8 sq.m)
Length: 25 ft 1 in (7.65 m)
Height: 10 ft 0 in (3.05 m)
Empty weight: 2,748 lb (1,246 kg)
Gross weight: 4,363 lb (1,979 kg)
Maximum speed: 129 mph (208 km/h; 112 kn) at sea level
Cruise speed: 117 mph (188 km/h; 102 kn)
Endurance: 3.95 hr
Service ceiling: 13,450 ft (4,100 m)
Rate of climb: 495 ft/min (2.51 m/s)
2 × fixed forward firing .30 in (7.62 mm) machine guns
2 × flexibly-mounted .30-in machine guns in rear cockpit
1 × .30-in machine gun firing through ventral grille
Crew: 2

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