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/ Stearman XBT-17
The Stearman XBT-17 was a prototype 1940s American two-seat low-wing monoplane primary trainer aircraft.
The company designation was known as the Model X-90.
It was evaluated by the United States Army Air Force in 1942 as the XBT-17.
The X-90 was a low-wing cantilever monoplane with two-seats in tandem under an enclosed canopy.
It had a fixed conventional landing gear and was powered by a 225 hp (168 kW) Lycoming R-680 engine and first flew in 1940.
It had wooden wings and a steel tube forward fuselage in order minimize use of aluminium.
In 1942 the aircraft was re-engined with a 450 hp (336 kW) Pratt & Whitney R-985 engine and redesignated the Model X-91.
The X-91 was evaluated by the United States Army Air Force as the XBT-17 but no more were built.
Prototype basic trainer with a 225 hp (168 kW) Lycoming R-680 engine.
The X-90 re-engined with a 450 hp (336 kW) Pratt & Whitney R-985 engine for USAAF evaluation.
United States Army Air Force designation for the X-91.
27 ft 9 in (8.46 m)
35 ft 9 in (10.90 m)
200 sq ft (19 m2)
3,080 lb (1,397 kg)
4,150 lb (1,882 kg)
1 × Pratt & Whitney R-985-AN-1,
450 hp (340 kW)
190 mph (310 km/h, 170 kn)
160 mph (260 km/h, 140 kn)
20,000 ft (6,100 m)
Rate of climb
1,300 ft/min (6.6 m/s)
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