I saw a new propane powered outboard motor at the Toronto Boat show a few weeks ago. It was so quiet the salesman had it running next to us in the booth as he explained the various features. There was virtually NO exhaust fumes!!! The fuel could be either a 20lb BBQ tank or you could stick a disposable sized, Coleman fuel can in it, which would be the ideal size if the motor was adapted for use in an Ebike.
