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Several years before the Type2 Ka-Mi was introduced, Japan experimented with a number of amphibious tank designs. The most successful of those designs was the Ishikawajima Automotive Works SR-II “Ro-Go.”
The Ishikawajima SR-II prototype was finished in mid 1935. It had a completely new Horstmann-type suspension consisting of three roadwheels, one return roller, a frontal driving sprocket and a rear idle wheel. The two forward roadwheels were connected by a small coil spring and a bogie. The rear roadwheel was connected the same way with the idle wheel. The bow was an integrated boat-shaped one that increased acceleration while afloat. An armor plate integrated in the middle of the bow armor could be raised as a splash shield.Operational tests were successful but the armament was still rated too weak — ironic since the Type92 Heavy Armored Vehicle accepted only two years prior by the Cavalry branch of the Army had the same armament (though it was later upgraded). Nevertheless the concept was overall rated “good.” For purposes of “what if” scenarios it is worth considering whether or not the vehicle would have been accepted by the Army if it had employed the 13.2mm Type92 heavy machine-gun that was used in the upgraded Type92 Heavy Armored Vehicle.
The fate of the vehicles is unknown. At least one was captured in 1945 by Soviet units in Manchuria. There is no known survivor.