The hull is about more than just good looks. the shape of the hull affects the speed, stability, and maneuverability of the rc boat. flat-bottom, monoplane. This is the 24" hot shot sprint tunnel hull boat by dumas. the hot shot sprint is designed for a 3.5cc outboard marine engine.. Mean machine 2, same super fast hull design as the original mean machine, but with the updated racing inspired cowl. this fiberglass hull is a lightweight fiberglass.