Stearman XBT-17
The Stearman XBT-17 was a prototype 1940s American two-seat low-wing monoplane primary trainer designed and built by Stearman Aircraft (as the Model X-90). It was evaluated by the United States Army Air Force in 1942 as the XBT-17. Design and development
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  Lycoming R-680 engine and first flew in 1940. It had wooden wings and a steel tube forward fuselage in order to minimize use of aluminum. In 1942 the aircraft was re-engined with a  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. According to Edward H. Phillips, "At that time, worries at the War Department about a shortage of strategic materials such as aluminum alloy were rampant. The wood/metal composite construction of the proposed monoplane, which required more raw materials than the biplane trainers on an aircraft-by-aircraft basis, was a major factor in the Air Corps' decision not to place the XBT-17 into production, according to a Boeing technical report." Variants
Stearman X-90
Prototype basic trainer with a  Lycoming R-680 engine. Stearman X-91
The X-90 re-engined with a  Pratt & Whitney R-985 engine for USAAF evaluation. Stearman XBT-17
United States Army Air Force designation for the X-91. Specifications (XBT-17)

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BT-17
1940s United States military trainer aircraft
Single-engined tractor aircraft
Low-wing aircraft
Aircraft first flown in 1940