RedactedNarrative: Victim was out on his boat working on his engine.  He did not have a life jacket with him.  He was somehow ejected from his boat along with the engine.  He was able to stay above water for a short time before tiring and being pulled under the water.  He was recovered by divers with the engine still attached to his shirt.  Engine throttle was about halfway between neutral and full speed.  The prop of the engine caught his shirt, twisting it and embedding it in the prop, thus tightening the shirt around him and cutting the engine power.   
   Cause of accident is operator inexperience and inattention, no pfd worn and the engine horsepower exceeded capacity for the vessel.