Maybe what you can do is to upgrade the motor to a more bigger/powerful motor. If not mistaken, yr SYMA boat is using twin-motor (correct me if I'm wrong!). If is a twin 350 motor, than maybe an upgrade to 550/600 motor will make it more powerful. But then, has to be careful with the receiver/speedcontroller combo. I also hv EP rc boat, using twin-350. It's good enough for my 3yrs-old boy. But for the dad, it's lame slow!!