Various toughts on this. If you have the time, lighten the whole bOAT as much as possible. But a MFA torpedo 850 will do with 2 x 12v 7amp batteries running at 12v 14 work a treat. MMB also do a nice 900 size motor that is fast. The key to getting the boat to plane is balance. get the boat sitting right, with the right battery/motor combination and she will do fine. Also keep in mind prop size/pitch as well. It all adds up. For the more adventurous you could go down the brushless route, but on that I am a novice!!