| Christie M1931 T1 Combat Car T3 Medium Tank | |
|---|---|
 Christie M.1931 during a demonstration, with Christie himself standing in the turret | |
| Type | Medium tank |
| Place of origin | United States |
| Service history | |
| In service | 1932–1936 |
| Used by | United States |
| Production history | |
| Designer | J. Walter Christie (US Wheel Track Layer Corporation) |
| Designed | 1930 |
| Manufacturer | US Wheel Track Layer Corporation |
| Unit cost | $34,500 (without armament, turret, engine, muffler or radio) |
| Produced | 1930–1931 |
| No. built | 9 |
| Specifications | |
| Mass | 22,220 lb (10 tonnes) [1] combat weight |
| Length | 5.55 m (18 ft 3 in) |
| Width | 2.23 m (7 ft 4 in) |
| Height | 2.28 m (7 ft 6 in) |
| Crew | 2 (Gunner, driver) [1] |
| Armor | 5⁄8 in (16 mm) maximum[a] [1] |
Main armament | 37mm M1916 (T3 Medium) 0.50 in (12.7 mm) M2 Browning machine gun (T1 Combat Car) |
Secondary armament | .30 in (7.62 mm) M1919A4 Browning machine gun |
| Engine | Liberty L-12 12-cylinder gasoline engine 449 hp (335 kW) at 2,000 rpm |
| Suspension | Christie suspension |
| Maximum speed | 40 mph (64 km/h) on wheels 25 mph (40 km/h) on tracks [1] |
The Christie M1931, known as the Combat Car, T1 in US Cavalry use and Medium Tank, Convertible, T3 in Infantry branch, was a wheel-to-track tank designed by J. Walter Christie for the United States Army using Christie's ideas of an aero-engine and the novel Christie suspension to give high mobility.
The M1931 was Christie's first tank to be accepted for production by the US Army and was used briefly by experimental tank units. Christie's design had more influence in Europe, with the USSR and the UK developing Christie's ideas in the form of Bystrokhodny (fast) tanks and cruiser tanks respectively.
- ^ a b c d Hunnicutt 1978, p. 24.
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