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O-I
Type Super-heavy tank
Place of origin  Japan
Production history
Designed 1939–1940(100ton O-I),
1944(120ton O-I)
Produced 1940(100ton O-I), 1945(120ton O-I)
Number built 2 (one 100ton O-I prototype, and one 120ton O-I prototype)
Specifications
Weight 100-120 tons
Length 10 m
Width 4.2 m
Height 4 m
Crew 11

Armor maximum of 200 mm(120ton O-I)
Primary
armament
105 mm gun with two light rocket artillery canisters
Secondary
armament
37 mm Type 1 gun, 3x 7.7 mm Type 97 machine gun(120ton O-I)
Engine Two V-12 gasoline engines
550PS
Power/weight 8.33 hp/t
Speed 25 km/h

O-I was the name given to a proposed series of Japanese super-heavy tanks, to be used in the Pacific Theater. The vehicle was monstrous, carrying 11 crew in its 100-120ton body, but only one 120ton O-I model was rumored to have been built in 1944 and afterward sent to Manchuria. Exact information is lacking however, and it is unknown whether it ever saw combat. Whereas the original plans called for three turrets for the one large cannon and two smaller guns, a more advanced experimental prototype, the Ultra-Heavy Tank OI featured no fewer than four turrets. It is unlikely that the Ultra-Heavy was ever actually built.

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