 The prototypes had a length, with gun, of 10.43 m, a width of 3.40 m and a height of 3.41 m. It was intended to fit a 1,200 hp engine to attain a speed much superior to all existing medium tank types.The Maybach HL 295 (a redesigned German gas engine in 1945 captured at Friedrichshafen by Engineer-General Joseph Molinié) and a Saurer diesel engine were tested.Both failed to deliver the required output and maximum speed was no higher than 51 km/h, while the cross-country speed was 20 km/h.