In the pool I just measured the maytech 65 /162: a rope attached and lying on the water surface. attach to the mast at the top of the boat. The nose on the board was held so that the nose can not ascend. The train was worth a maximum of 72 kilograms at 54 V / 146 A. the water temp. 26 degrees celsius, sweet water. it is a huge increase in performance against my previous drive. which, of course, is mainly due to the large propeller with 180 mm and the strong torque of the 6-pole in-runner. The scales I have used is a calibrated digital scale which is suitable for up to 200 kilograms.