I'm in the beginning proses of building My Mini airboat I'm calling the "Water Bug". At this point I don't have a hull, but have an idea what I want. Around a 14' very flat ( mud) Bottom Jon that I would put out riggers on or Fabricate a catamaran type hull with FLAT tubes . Right now I have a 1971 VW Bug motor. 1600cc air cooled around 60 Hp. I got it running very nice, I still need to get a voltage regulator for the generator and a fuel pump. Right now I'm gravity feeding fuel , I'm going to go with an electric external fuel pump both on order. I'm in contact with a prop manufacture and am on hold . I am torn as to witch end of my VW motor I need to put my prop. Direct dive or reduced. Each would need a different prop size and direction. I finally got the little motor running nice, and it sounds strong, for 1600cc 50hp vw . .As you can see I had to put the starter on to "Back" of the motor and it sticks out about a foot. If I run off that end ,either direct or reduced it need to be past the end of the starter. The front ,belt end, I read that the bushing on the crank will not hold up to the strain of a prop. So I would have to reduce it Belt or chain. How come a person just could not add a chain Drive on to crank up to the generator and put the Prop on the generator ??? Would a motorcycle chain hold up? Would the generator an stand holdup ? THOUGHTS ?