Abstract: Employee #1 was testing a prototype 18 ft inboard motorboat on a lake in central Florida. He had made a 1/4 mile run at about 35 to 40 mph. The boat was running bow-up and was porpoising. He made a second run and was making a wide shallow right turn at about 30 mph. About halfway through the turn, with the boat still porpoising, the bow of the boat dug into the 1 ft chop on the lake. The jar tore the seat loose and Employee #1 was thrown forward and over the left side. The boat skidded sideways over him, catching him with the horseshoe-shaped rudder around the propeller that was 12 in. in diameter. His upper torso was severely cut up. He died before the paramedics arrived.