Possessing all the characteristics of a tank, however, the M18 Hellcat was still classified as a tank destroyer. The Hellcat M18 weighed about 18.7 tons, a length of 5.28 m, a width of 2.87 m, and a height of 2.57 m. It had a crew of 5, including: Commander, gunner, loader, driver, and assistant driver. The Hellcat was originally powered by a 350 hp Continental R975-C1 engine, which was later replaced by a 400 hp Continental R975-C4 engine. The vehicle could reach a top speed of 55 mph, with a range of 100 miles.