Variations in the basic Stearman 80 design, with Wasp engine and Hamilton controllable pitch propeller, are the Stearman 81 and 82.
The 1933 Stearman 80 (ATC 504) was a primary trainer developed from the Model 4 series. A rear cockpit canopy was added. One was built, registered NC11720.
The 1933 81 Sportster (ATC 504) was a cabin version of the Model 80. The one built, NC570Y, priced at $8,500, featured canopied cockpits, front pilot seat, and larger fuel tanks. It was subsequently refitted with a 430hp Wright engine, and mounted on floats for a South American demonstration tour.
The model 81 Sportster was sold to the Mexican government.
80
Engine: Pratt & Whitney Wasp Jr. T3A, 420 hp
Length: 25 ft 1 in
Height: 9 ft 8 in
Wing span upper: 35 ft
Wingspan lower: 27 ft
Chord Upper: 62 in
Chord lower: 48 in
Wing area: 275 sq.ft
Airfoil: NACA 4412
Empty wt: 2436 lb
Max weight: 3500 lb
Useful load: 1064 lb
Payload: 210 lb
Fuel capacity: 104 USG
Oil cap: 8 USG
Ceiling: 19,600 ft
Range: 650 sm
Max speed: 175 mph
81
Engine:
Pratt & Whitney Wasp Jr. SB, 400 hp
Pratt & Whitney Wasp Jr. T3A, 420 hp
Length: 25 ft 1 in
Height: 9 ft 4 in
Wing span upper: 35 ft
Wingspan lower: 27 ft
Chord Upper: 62 in
Chord lower: 48 in
Wing area: 275 sq.ft
Airfoil: NACA 4412
Empty wt: 2385 lb
Max weight: 4000 lb
Useful load: 1615 lb
Payload: 230 lb
Fuel capacity: 155 USG
Oil cap: 10 USG
Ceiling: 17,000 ft
Range: 900 sm
Max speed: 170 mph
Price: $12,500, reduced to $8500 in 1935
All Aero 