Anyone have any experience or thoughts on mud motors for boats.  I mean those homemade contraptions that you see on boats in the Louisianna and Florida swamps.  I have a couple of decent air-cooled motors kicking around and was thinking of building one of these units to put on the back of my 14 foot aluminum for the river (NSR and Athabasca).  A short shaft version.  I wonder if 6 hp would be enough in the current, not looking to go too far.  They are meant for very shallow water and seem to work pretty well.  You would think that you could keep it off the rocks.  I have a deep leg 9.9 Johnson for the lake but I don't dare take it on the river.  A short leg maybe.

This is what I am talking about.  If it works well, maybe I'll upgrade to a Harley...

Mud Motors are great!
Good fuel economy, go any where...
Have experience with Go-Devil Long tail, 23 hp MudBuddy mini and 27 hp Pro-Drive.
The surface drives are better then the long tails for rivers, tighter turns more comfortable to operate way faster..