these grinders turn around 10,000- rpm---I bet they can be used to power the boat in a pinch--jus' hook it up where the power head to a small outboard was--using a generator for power----I got this idea whilst driftin in nowheresville---I had a yamaha generator---a small electric drill---and the shaft from the sea generator----anything wooda' been bettern' nuttin.necessity is the "muther of all inventions"