My friend and I built this RC airboat just for fun. We used pink insulation foam from home depot, and we fiberglassed the bottom so that we could drive it on asphalt. We got the airboat to go so fast on asphalt that it did a backflip. We used a 1200kv NTM propdrive motor, a 20A Turnigy Plush ESC, a 4s 2200mah battery, and a waterproof high torque servo. We put all the electronics inside a waterproof food container. It was a blast to build and drive.