The Stearman models X-90 and -91 of 1940 were two-place primary/basic trainer. They featured a metal fuselage, and metal-framed fabric-covered wings and tail.
One prototype as the X-90 42-8726 went for military evaluation.
The model 91 was the final model with a 450hp P&W Wasp engine as the XBT-17.
90
Engine: Lycoming R-680, 225 hp
Length: 28 ft 6 in
Wing span: 35 ft 9 in
Wing area: 200 sq.ft.
Max weight: 2810 lb
Useful load: 709 lb
Ceiling: 15,000 ft
Max speed: 140 mph
Cruise: 115 mph
Stall: 58 mph
Seats: 2
X-91 / XBT-17
Engine: Pratt & Whitney Wasp Jr, 450 hp
Wing span: 35 ft 9 in
Wing area: 200 sq.ft.
Length: 28 ft 6 in
Max weight: 2810 lb
Useful load: 1070 lb
Max speed: 190 mph
Cruise: 160 mph
Stall: 68 mph
Ceiling: 15,000 ft
Seats: 2
All Aero 