The 1928 Stearman C-3A was designed by Lloyd Stearman and Mac Short, essentially the same design as C2 except for the addition of a baggage compartment and various motors. The first Wichita Stearman, two C-3A models were built.
One hundred and thirty-six C-3B (ATC 55) were built from 1927 to 1929. ATC 2-124 was for EDO float conversions. They were priced at $8,970. One was built as C-3B Special under ATC 2-159 as a prototype mail carrier for the C-3MB model.
The 1928 C-3C (ATC 62) built with a 150hp Hisso A engine. Two or three were built with possibly one, NC3440, converted to a C-3D model with a 180hp Hisso E engine and increased performance.
One model C-3F was built, in 1928.
The sole C-3H built, in 1928, was powered by a 240hp Menasco engine.
Three model C-3K (ATC 2-70) was built in 1928 with a 125hp Siemens-Halske SH-12 engine. They were conversions of NC4713 and N7775, and one conversion from C-3B NC4098 under ATC 2-70.
One C-3L (ATC 2-58) model built in 1929, NX/NC6438, was powered by a 130hp Comet engine. It was later modified to C3C and C3B standard.
Eight of the C-3MB (ATC 137) single-place mail plane version of the C-3B were built from 1929; NC6487, NC6490, NC6496, and NC9057-9061, plus five modifications of C-3B with similar data; NC4552, NC6436, NC6486, NC7171, and NC8836, and five converted from C-2B; NC1598, NC3863, NC4011, NC4273, and NC5500.
One C-3 model was built under ATC 2-159 as the C-3B Special.
The last C-3 manufactured was the 1933 C-3P (ATC 2-445) NR/NC567Y, powered with a 220hp Wright J-5 engine.
The 1929 three-place C3R Business Speedster was certified under ATC 251. The prototype was the last of the C3Bs, NC8828. Priced at $8,500, thirty-eight were built; NC566Y, NR567Y, NC656K-C662K, NC668K-673K, NC675K, NC773H, NC775H, NC780H-782H, NC789H-790H, NC793H-94H, NC799H, NC8822, NC8828, and NC8840. One was converted to C3P NR567Y and ten went to the Peruvian AF.
The Stearman biplane aircraft were well known in agri¬cultural aviation, with the C3BR of the ‘20s being fitted with a 450-hp Pratt & Whitney Wasps or Wright Cyclones.
C-3B Sport Commercial
Engine: Wright J5, 220hp
Length: 24 ft
Height: 9 ft
Wing span upper: 35 ft
Wingspan lower: 28 ft
Chord Upper: 66 in
Chord lower: 54 in
Wing area: 297 sq.ft.
Airfoil: Stearman
Empty weight: 1625 lb
Max weight: 2650 lb
Useful load: 1025 lb
Payload: 445 lb
Fuel capacity: 68 USG
Oil cap: 8 USG
Ceiling: 18,000 ft
Range: 620 sm
Max speed: 126 mph
Price: US$8,970
C-3C
Engine: Wright/Martin Hispano-Suiza A, 150 hp
Length: 24 ft 6 in
Height: 9 ft
Wing span upper: 35 ft
Wingspan lower: 28 ft
Chord Upper: 66 in
Chord lower: 54 in
Wing area: 297 sq.ft.
Airfoil: Stearman
Empty weight: 1790 lb
Max weight: 2750 lb
Useful load: 960 lb
Payload: 380 lb
Fuel capacity: 68 USG
Oil cap: 5 USG
Ceiling: 15,000 ft
Range: 550 sm
Max speed: 121 mph
C-3D
Engine: Wright/Martin Hispano-Suiza E2, 190 hp
Length: 24 ft 6 in
Height: 9 ft
Wing span upper: 35 ft
Wingspan lower: 28 ft
Chord Upper: 66 in
Chord lower: 54 in
Wing area: 297 sq.ft.
Airfoil: Stearman
C-3E
Engine: Wright/Martin Hispano-Suiza E2, 190 hp
Length: 24 ft 6 in
Height: 9 ft
Wing span upper: 35 ft
Wingspan lower: 28 ft
Chord Upper: 66 in
Chord lower: 54 in
Wing area: 297 sq.ft.
Airfoil: Stearman
Fuel capacity: 38 USG
C-3F
Engine: Wright/Martin Hispano-Suiza E3, 190 hp
Length: 24 ft 6 in
Height: 9 ft
Wing span upper: 35 ft
Wingspan lower: 28 ft
Chord Upper: 66 in
Chord lower: 54 in
Wing area: 297 sq.ft.
Airfoil: Stearman
Fuel capacity: 38 USG
C-3G
Engine: Wright/Martin Hispano-Suiza E4, 190 hp
Length: 24 ft 6 in
Height: 9 ft
Wing span upper: 35 ft
Wingspan lower: 28 ft
Chord Upper: 66 in
Chord lower: 54 in
Wing area: 297 sq.ft.
Airfoil: Stearman
Fuel capacity: 39 USG
C-3H
Engine: Menasco-Salmson, aircooled, 260 hp
Length: 24 ft 6 in
Height: 9 ft
Wing span upper: 35 ft
Wingspan lower: 28 ft
Chord Upper: 66 in
Chord lower: 54 in
Wing area: 297 sq.ft.
Airfoil: Stearman
C-3I
Engine: Curtiss C6, 160 hp
Length: 24 ft 6 in
Height: 9 ft
Wing span upper: 35 ft
Wingspan lower: 28 ft
Chord Upper: 66 in
Chord lower: 54 in
Wing area: 297 sq.ft.
Airfoil: Stearman
Fuel capacity: 38 USG
C-3K
Engine: Siemens-Halske SH-12, 128 hp
Length: 24 ft 6 in
Height: 9 ft
Wing span upper: 35 ft
Wingspan lower: 28 ft
Chord Upper: 66 in
Chord lower: 54 in
Wing area: 297 sq.ft.
Airfoil: Stearman
Max weight: 2400 lb
Fuel capacity: 38 USG
C-3L
Engine: Comet, 130 hp
Length: 24 ft 6 in
Height: 9 ft
Wing span upper: 35 ft
Wingspan lower: 28 ft
Chord Upper: 66 in
Chord lower: 54 in
Wing area: 297 sq.ft.
Airfoil: Stearman
Max weight: 2525 lb
Fuel capacity: 38 USG
C-3MB
Engine: Wright J5, 220hp
Length: 24 ft
Height: 9 ft
Wing span upper: 35 ft
Wingspan lower: 28 ft
Chord Upper: 66 in
Chord lower: 54 in
Wing area: 296 sq.ft.
Airfoil: Stearman 2
Empty weight: 1895 lb
Max weight: 2830 lb
Useful load: 935 lb
Payload: 330 lb
Fuel capacity: 68 USG
Oil cap: 7 USG
Ceiling: 17,500 ft
Range: 560 sm
Max speed: 130 mph
Price: US$8,730
C-3P
Engine: Wright J5 Whirlwind, 220hp
Length: 24 ft 6 in
Height: 9 ft
Wing span upper: 35 ft
Wingspan lower: 28 ft
Chord Upper: 66 in
Chord lower: 54 in
Wing area: 297 sq.ft.
Airfoil: Stearman
Max weight: 2830 lb
Fuel capacity: 38 USG
C-3R Business Speedster
Engine: Wright J6-7, 225hp
Length: 24 ft 11 in
Height: 9 ft
Wing span upper: 35 ft
Wingspan lower: 28 ft
Chord Upper: 66 in
Chord lower: 54 in
Wing area: 294 sq.ft.
Airfoil: Stearman 2 or Stearman 6
Empty weight: 1741 lb
Max weight: 2754 lb
Useful load: 1013 lb
Payload: 403 lb
Fuel capacity: 65 USG
Oil cap: 7 USG
Ceiling: 17,500 ft
Range: 550 sm
Max speed: 130 mph
Price: US$8,500
All Aero 