Hull type: tunnel hull with full length sponsons developed for sheet plywood planking. power: long shaft outboard motor to 140 hp. can the hull be extended or. 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..