Five of the 1929 4-C or C-4 Junior Speedmail (2-155) were built, NS2=NS12=NC13905, NC665K, NC667K, NC8839 and NC772H. Priced at $12,500, they were powered by a 300hp Wright J-6 engine.
Four were re-powered with the 330hp J-6 as C-4A under ATC 304, and one was converted to 4-CM, NC772H.
The 1930 4-CM and -CM-1 Senior Speedmail were single-place mail version of the 4-C with 300hp Wright J-6 engines, under ATC (2-177). Three were built, NC770H, CF-CCG, CF-CCH plus one 4-C converted under (2-177), NC772H. The CM-1 had radio and night-flying equipment; twelve were built.
The Stearman 4E was introduced in 1930 as a mail plane. This aircraft was known as the Bull Stearman and was still in ag use until the late 1960s.
Powered by a 300 horsepower Wright R 975 engine, the Stearman 4DM Senior Speedmail was designed to haul mail and cargo. The 38 foot wingspan DM was larger than the standard Stearman, and was the last mail carrying Stearman built. Only two examples were made.
Six to eight of the Model 4-D Junior Speedmail (ATC 305) of 1930 were built.
The 1931 Models 4-DM and 4-DM-1 Senior Speedmail (ATC 326) were single-place mail version of the 4-D with 300hp P&W Wasp Jr engines. Two were converted from 4-CM (NC487W) and 4-D (NC774H). The DM-1 had radio and night-flying equipment. A restored model in El Cajon CA was registered as NC485W.
One Model 4-D (NC792H) was converted to a two-place 4-DX Junior Speedmail (ATC 2-406) in 1932 with 400hp P&W Wasp S1A and sliding cockpit canopy.
The 1930 4-E Junior Speedmail was under ATC 292. Ten were built, with two as three-place model 4-E Special under ATC 2-278.
The single-place 4-EM and 4-EM-1 Senior Speedmail of 1930 were a mail version of the 4-E with 450hp P&W Wasp under ATC 322. Five were built, priced at $16,000. The EM-1 had radio and night-flying equipment.
The single Stearman 4-EX built was for the Standard Oil Co (Stanavo). Built in 1930 under ATC 2-279, the two-place Senior Speedmail NC783H had deluxe appointments, cowling and wheel pants, and a distinctive red-white-and-blue paint job. It was powered with a 450hp P&W Wasp SC engine.
The 1930 4-RM Special NX484W four-place cabin model was repowered with 450hp Ranger GV-770 engine.
4C
Engine: Wright J6-9, 300hp
Length: 26 ft 11 in
Height: 10 ft 2 in
Wing span upper: 38 ft
Wingspan lower: 28 ft
Chord Upper: 66 in
Chord lower: 51 in
Wing area: 307 sq.ft.
Airfoil: Goettingen 436
Empty weight: 2256 lb
Max weight: 3800 lb
Useful load: 1544 lb
Payload: 663 lb
Fuel capacity: 106 USG
Oil cap: 10 USG
Ceiling: 15,000 ft
Range: 720 sm
Max speed: 145 mph
Price: US$12,500
4CM
Engine: Wright J6-9, 300hp
Length: 26 ft 11 in
Height: 10 ft 2 in
Wing span upper: 38 ft
Wingspan lower: 28 ft
Chord Upper: 66 in
Chord lower: 51 in
Wing area: 307 sq.ft.
Airfoil: Goettingen 436
Empty weight: 2285 lb
Max weight: 3936 lb
Useful load: 1651 lb
Payload: 770 lb
Fuel capacity: 106 USG
Oil cap: 10 USG
Ceiling: 14,800 ft
Range: 750 sm
Max speed: 147 mph
Price: US$12,500
4CM-1
Engine: Wright J6-9, 300hp
Length: 26 ft 11 in
Height: 10 ft 2 in
Wing span upper: 38 ft
Wingspan lower: 28 ft
Chord Upper: 66 in
Chord lower: 51 in
Wing area: 307 sq.ft.
Airfoil: Goettingen 436
Empty weight: 2540 lb
Max weight: 4067 lb
Useful load: 1527 lb
Payload: 770 lb
Fuel capacity: 84 USG
Oil cap: 8 USG
Ceiling: 14,500 ft
Range: 600 sm
Max speed: 147 mph
Price: US$15,000
4D
Engine: Pratt & Whitney Wasp Jnr, 300hp
Length: 26 ft 11 in
Height: 10 ft 2 in
Wing span upper: 38 ft
Wingspan lower: 28 ft
Chord Upper: 66 in
Chord lower: 51 in
Wing area: 307 sq.ft.
Airfoil: Goettingen 436
Empty weight: 2297 lb
Max weight: 3800 lb
Useful load: 1503 lb
Payload: 622 lb
Fuel capacity: 106 USG
Oil cap: 10 USG
Ceiling: 15,000 ft
Range: 720 sm
Max speed: 145 mph
Price: US$12,500
4DX
Engine: Pratt & Whitney Wasp Jnr S1A, 400hp
Length: 26 ft 11 in
Height: 10 ft 2 in
Wing span upper: 38 ft
Wingspan lower: 28 ft
Chord Upper: 66 in
Chord lower: 51 in
Wing area: 307 sq.ft.
Airfoil: Goettingen 436
Empty weight: 2297 lb
Max weight: 3800 lb
Useful load: 1503 lb
Payload: 622 lb
Fuel capacity: 106 USG
Oil cap: 10 USG
Ceiling: 15,000 ft
Range: 720 sm
Max speed: 145 mph
Price: US$12,500
4DM
Engine: Pratt & Whitney Wasp Jnr, 300hp
Length: 26 ft 11 in
Height: 10 ft 2 in
Wing span upper: 38 ft
Wingspan lower: 28 ft
Chord Upper: 66 in
Chord lower: 51 in
Wing area: 307 sq.ft.
Airfoil: Goettingen 436
Empty weight: 2326 lb
Max weight: 3936 lb
Useful load: 1610 lb
Payload: 729 lb
Fuel capacity: 106 USG
Oil cap: 10 USG
Ceiling: 14,800 ft
Range: 750 sm
Max speed: 147 mph
Price: US$15,000
4DM-1
Engine: Pratt & Whitney Wasp Jnr, 300hp
Length: 26 ft 11 in
Height: 10 ft 2 in
Wing span upper: 38 ft
Wingspan lower: 28 ft
Chord Upper: 66 in
Chord lower: 51 in
Wing area: 307 sq.ft.
Airfoil: Goettingen 436
Empty weight: 2326 lb
Max weight: 3936 lb
Useful load: 1610 lb
Payload: 729 lb
Fuel capacity: 106 USG
Oil cap: 10 USG
Ceiling: 14,800 ft
Range: 750 sm
Max speed: 147 mph
Price: US$15,000
4E
Engine: Pratt & Whitney Wasp C1, 420hp or Wasp SC-1, 450 hp
Length: 26 ft 4 in
Height: 10 ft 2 in
Wing span upper: 38 ft
Wingspan lower: 28 ft
Chord Upper: 66 in
Chord lower: 51 in
Wing area: 307 sq.ft.
Airfoil: Goettingen 436
Empty weight: 2426 lb
Max weight: 3936 lb
Useful load: 1510 lb
Payload: 629 lb
Fuel capacity: 106 USG
Oil cap: 10 USG
Ceiling: 18,000 ft
Range: 580 sm
Max speed: 158 mph
Price: US$16,000
4-E Junior Speedmail
Engine: 420hp P&W Wasp Sr
Wingspan: 38’0″
Length: 26’11”
Useful load: 1510 lb
Max speed: 158 mph
Cruise: 130 mph
Stall: 55 mph
Range: 580 mph
Seats: 1
4EM / 4EM-1 Senior Speedmail
Engine: Pratt & Whitney Wasp, 420-450hp
Length: 26 ft 4 in
Height: 10 ft 2 in
Wing span upper: 38 ft
Wingspan lower: 28 ft
Chord Upper: 66 in
Chord lower: 51 in
Wing area: 307 sq.ft.
Airfoil: Goettingen 436
Empty weight: 2455 lb
Max weight: 3936 lb
Useful load: 1481 lb
Payload: 600 lb
Fuel capacity: 106 USG
Oil cap: 10 USG
Ceiling: 18,000 ft
Range: 600 sm
Max speed: 160 mph
Cruise: 134 mph
Stall: 55 mph
Seats: 1
Price: US$16,000
4EX Special
Engine: Pratt & Whitney Wasp SC-1, 450hp
Length: 26 ft 4 in
Height: 10 ft 2 in
Wing span upper: 38 ft
Wingspan lower: 28 ft
Chord Upper: 66 in
Chord lower: 51 in
Wing area: 307 sq.ft.
Airfoil: Goettingen 436
Max weight: 3936 lb
Fuel capacity: 106 USG
Oil cap: 10 USG
Ceiling: 18,000 ft
Range: 580 sm
Max speed: 158 mph
Seats: 3
4-RM Special
Engine: 450hp Ranger GV-770
Seats: 4
All Aero 