Christie M1931

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.

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