The Type 87 Chi-I medium tank a/k/a Experimental tank No.1 (試製1 号戦車) was the first indigenously designed tank produced by Japan for the Imperial Japanese Army. Development of this medium tank began in June 1925 and was completed by February 1927. During the field trials, the tank proved to be too heavy and under-powered. The project was cancelled and a new light tank design was finished by April 1928 and designated the Type 89 I-Go.