A prop drive adapter and cut the head fins down a bit, Hummmm.[>:]

http://www.osengines.com/engines/osmg1978.html

Look where it makes it's horsepower.

FF, the only potential I see is that on a surf casting rod, I could maybe get 600 feet with one of these tied on......instead of the usual 550 feet I get when using a ST 90 for a weight. Cutting the head fins down is usually good for another 5 feet.

FF, what do you see in this engine? You must have something up your sleeve?