THE 2-MINUTE RULE FOR HIGH HORSEPOWER OUTBOARD MOTORS

The h2o caterpillar boat propulsion program (Common Science Every month, December 1918) An early unusual signifies of boat propulsion was the drinking water caterpillar. This moved a series of paddles on chains together The underside with the boat to propel it around the h2o and preceded the development of tracked vehicles.Mercury MerCruiser engine