Brushless motors are waterproof (IP-67) and able to operate in extreme temperatures. The motor’s liquid-cooling allows the motor to be heated in extreme cold and cooled in extreme hot, while still allowing the motor to produce maximum continuous power. The motors are compact - the 250 hp motors are only 14 in. in diameter and 40 in. long, weighing 670 lbs. They are available in inch or metric dimensions and with custom shafts and mountings and are made in sizes from 1 hp to over 500 hp.