Boat 1 was traveling at half throttle when the operator turned sharply into a large wake.  Operator was knocked out of the boat and the boat began turning in circles. Operator tried to catch onto boat and was struck by outboard motor prop. A man on a nearby pontoon boat came to aid operator of boat 1 who was bleeding severely.  He forced boat 1 to the shore with his boat and then jumped in to help the injured man . Operator was carried by pontoon boat to boat ramp and met by EMTs. He was careflighted to the hospital and treated for severe cuts to his arm and torso. Operator was not wearing PFD or kill switch lanyard. Alcohol was not a factor.  I found all mechanical controls to be operational as designed.
Pineland