Typically an inrunner will be a better choice although you could try an outrunner with higher kv and see how it goes. The renegade rigger flies and it has an outrunner. i would use a bigger one than the renegade rigger has. that boat is 18" i believe. with that size its hard to say for an inrunner. maybe a 540s or 380xl would work well. 380xl on 3s lipo, 540s on a 2s lipo.