Well, its not quite fusion powered high-technology, but its been used for centuries and is sworn to by many. Often seen in the Orient and elsewhere, but not much in the States… check out the Yulah (single oar) type rowing.

There are actually quite a few resources to learn about this propulsion method:

Simplicity Boats has a Yulah Page. There is also a link from there to a Wooden Boat article that is quite detailed.

Why use auxiliary propulsion for your sailboat if you can propel it by hand???