Holt gas electric tank

Holt Gas-Electric Tank
Holt prototype gas electric tank.jpg
Place of origin United States
Specifications
Weight25.4 t
Length5.03 m
Width2.76 m
Height2.37 m
Crew6

Armor6–15 mm
Main
armament
75 mm Vickers mountain howitzer
Secondary
armament
two M1917 Browning 7.62 mm machine guns
Engine4-cyl Holt gasoline plus 2 electric motors
90 hp (67 kW)
Power/weight3.5 hp/tonne
Suspensionvertical coil springs
Operational
range
50 km
Speed10 km/h

The Holt Gas-Electric Tank was the first prototype tank built in the United States [1] in a collaboration between the Holt Manufacturing Company (now Caterpillar Inc.) and the General Electric Company. The tank, built during 1917-1918, was the only one of its kind built, as testing proved it lacked the agility and maneuverability required.[2] The crew number is often given as six, on the assumption there would be two machine gunners, a gunner and loader for the main gun, a driver and a commander.

Construction

The tank was based on a lengthened and modified version of the suspension of the Holt Model 75, with pivoting track frames. There were ten road wheels at each side. The tank was 7 feet 9.5 inches (2.375 m) tall, 16 feet 6 inches (5.03 m) long, and 9 feet 1 inch (2.77 m) wide. The vehicle had a Holt 90 horsepower (67 kW), 4-cylinder engine fitted with a General Electric generator driving an electric motor for each track; a comparable petro-electric system had earlier been used for the French Saint-Chamond that also was fitted with a lengthened Holt suspension. To prevent overheating the transmission—a constant problem with electrical types—a complicated water cooling system had been installed.