hobie trolling motor ?
 

found this today.. Thought it looks interesting for you hobie folks...

http://www.ebay.com/itm/NEW-Trolling...item3a8144d92a

how about a weed wacker...
 

last month or two I saw a couple of fellas with the hobies and instead of the drive had modified honda weed wackers in the drive clips.

Visualize this: in place of the weed wacking line there is a small prop. Looked pretty effective and since it was a honda it was not too noisy.

Looked pretty sweet and effective.

If you want motorized... based on what I've seen and done, the weed wacker method may be the way to go.

that's interesting..no damage due to it being used in saltwater?