Following burning out the motor by fouling the prop on a polythene bread wrapper I fitted a new 160 amp speed controller and got a bargain motor from Giant Shark. it is an Emax GT4020 which cost about £14. I realised what a bargain it was and went back only to find Giant Shark have ceased trading. The video shows the boat running on a 4 cell Lipo, it goes a bit quicker on a 5 cell that I have. I am really sold on Lipo power as Dave said I would be. I have just ordered a 3 cell Lipo for my crash tender