Ford Trimotor - Variants

Variants

Ford 3-AT

The original Stout prototype; one built.

Ford 4-AT

Pre-production prototype, powered by three 200 hp (150 kW) Wright J-4 Whirlwind radial piston engines, accommodation for two pilots and eight passengers; one built.

Ford 4-AT-A

The original production version, similar to the Ford 4-AT prototype; 14 built.

Ford 4-AT-B

Improved version, powered by three 220 hp (160 kW) Wright J-5 Whirlwind radial piston engines, accommodation for two pilots and 12 passengers; 39 built.

Ford 4-AT-C

Similar to the Ford 4-AT-B, equipped with a 400 hp (300 kW) Pratt & Whitney Wasp radial piston engine, fitted in the nose of the aircraft; one built.

Ford 4-AT-D

Three aircraft similar to the Ford 4-AT-B, each with different engines and minor modifications.

Ford 4-AT-E

Similar to the Ford 4-AT-B, powered by three 300 hp (220 kW) Wright J-6-9 Whirlwind nine-cylinder radial piston engines; 24 built.

Ford 4-AT-F

One aircraft similar to the Ford 4-AT-E.

Ford 5-AT-A

Enlarged version, powered by three 420 hp (310 kW) Pratt & Whitney Wasp radial piston engines, accommodation for two pilots and 13 passengers, the wingspan was increased by 3 ft 10 in (1.17 m); three built.

Ford 5-AT-B

Similar to the Ford 5-AT-A, powered by 420 hp (310 kW) Pratt & Whitney Wasp C-1 or SC-1 radial piston engines, accommodation for two pilots and 15 passengers; 41 built.

Ford 5-AT-C

Improved version, similar to the Ford 5-AT-A, accommodation for two pilots and 17 passengers; 51 built.

Ford 5-AT-CS

Seaplane version, fitted with Edo floats; one built.

Ford 5-AT-D

Increased-weight version, powered by three 450 hp (340 kW) Pratt & Whitney Wasp SC radial piston engines. The wings were mounted 8 in (0.20 m) higher, to increase cabin headroom, but otherwise similar to the Ford 5-AT-C; 20 built.

Ford 5-AT-DS

Seaplane version, fitted with Edo floats; one built.

Ford 5-AT-E

Proposed version, the engines were relocated to the wing leading edges.

Ford 6-AT-A

Similar to the Ford 5-AT-A, powered by three 300 hp (220 kW) Wright J-6-9 radial piston engines; three built.

Ford 6-AT-AS

Seaplane version, fitted with Edo floats; one built.

Ford 7-AT-A

Resignation of a single Ford 6-AT-A, equipped with a 420 hp (310 kW) Pratt & Whitney Wasp radial piston engine, fitted in the nose of the aircraft.

Ford 8-AT

One Ford 5-AT-C converted into a single engine freight transport aircraft. Six different engines ranging from 575 hp (429 kW) to 700 hp (520 kW) were installed.

Ford 9-AT

Redesignation of a single Ford 4-AT-B, fitted with three 300 hp (220 kW) Pratt & Whitney Wasp radial piston engines.

Ford 11-AT

Redesignation of a single Ford 4-AT-E, fitted with three 225 hp (168 kW) Packard DR-980 diesel engines.

Ford 13-A

Redesignation of a single Ford 5-AT-D, fitted with two 300 hp (220 kW) Wright J-6-9 Whirlwind radial piston engines, and a 575 hp (429 kW) Wright Cyclone radial piston engine fitted in the nose of the aircraft.

Ford 14-A

Large three-engined version, powered by three 1,000 hp (750 kW) Hispano-Suiza 18 Sbr piston engines (W engines: 3 x 6 cylinders), accommodation for two pilots and 40 passengers.

Ford XB-906

One Ford 5-AT-C was converted into a three-engined bomber aircraft.