... Running time: 5 hours total (full post) 2011 new water bumper boat1.Weight :17.5 kg (without battery ... its role, oval tire provides stable boat, a propeller diameter of 6.5 cm in water and ... DC permanent magnet motor drives a two-blade propeller new to generate power, high technology principles for the ... Motor: 12 volt DC permanent magnet motor(4)Propeller: diameter 6.5 cm height and positioning of two ...