Abstract: A system to prevent injuries due to marine propellers striking swimmers and other persons in the water next to a boat utilizing a switch. The switch is normally in a closed position and is only opened when a movable element such as a ladder, gate, and the like on the boat travels to an unlatched position. Such movement interrupts the ignition circuit of the boat motor. An override device is also employed to allow normal operation of the marine engine and requires both mechanical and electrical interconnection or matting of connector elements.

Abstract: A guard for a marine propeller utilizing a flange found on the lower drive unit or power leg, thereof. The guard includes a cage which at least partially encloses the propeller and a support member for holding the cage to the lower drive unit. A support member includes a bracket having a pair of legs with an intermediate portion between the two legs. The bracket is joined to the cage and fixed to the flange found in the lower drive unit of the marine engine having the marine propeller.