I started building this boat about 15 years ago and still have not finished it.I have to do all of the finer work on the decks and mast. I just added a water pump last month to keep the motor cool . The force flow system did not work with little or no water getting through and the motor and controller got very hot after a short running time. I have not given the boat a long high speed run yet but test in my swimming pool seems satisfactory with the pump putting through a large volume of water (5/10)