Type 89 I-Go medium tank

Type 89 I-Go (Chi-Ro)
A restored Type 89 I-Go at Tsuchiura JGSDF Base open day
Type	Medium tank
Place of origin	Empire of Japan
Production history
Designed	1928
Unit cost	Model Otsu: 97,000 yen ($26,064 USD) in August 1939, excluding armaments[1][2]
No. built	404[3]
Specifications
Mass	12.79 metric tons (14.10 short tons)
Length	5.73 m (18 ft 10 in)
Width	2.15 m (7 ft 1 in)
Height	2.56 m (8 ft 5 in)
Crew	4
Armor	6 to 17 mm (0.24–0.67 in)
Main armament	57 mm Type 90 gun 100 rounds[4]
Secondary armament	2 x 6.5 mm Type 91 machine gun (hull, turret rear) 2,745 rounds[4]
Engine	Mitsubishi A6120VD air-cooled inline 6-cylinder diesel 120 hp (90 kW)/ 1800 rpm 14,300cc
Suspension	leaf spring
Operational range	170 km (110 mi)
Maximum speed	26 km/h (16 mph)

The Type 89 medium tank I-Go (八九式中戦車　イ号, Hachikyū-shiki chū-sensha I-gō) is a medium tank used by the Imperial Japanese Army from 1932 to 1942 in combat operations of the Second Sino-Japanese War, at Khalkhin Gol against the Soviet Union, and in the Second World War. The Type 89B model was the world's first mass-produced diesel engine tank.^[5] The tank was armed with a short-barrel 57 mm cannon for knocking out pillboxes and masonry fortifications, and proved effective in campaigns in Manchuria and China, as the Chinese National Revolutionary Army had only three tank battalions to oppose them, which consisted primarily of Vickers export models, German Panzer Is, and Italian CV33 tankettes.^[6] The Type 89 was a 1920s design medium tank, built to support the infantry, and thus lacked the armor or armament of 1940s generation Allied armor; it was regarded as obsolete by the time of the 1939 battles of Khalkhin Gol, against the Soviet Union.^[7] The code designation "I-Go" comes from the katakana letter [イ] for "first" and the kanji [号] for "number". The designation is also transliterated Chi-Ro and sometimes "Yi-Go".^[8][9]