We came across a piece today over at Motorbike Writer about Yamaha preparing a water-powered motorcycle, and while a quick Google revealed this to be nothing more than a Yamaha-sponsored thesis project from 2016, the idea itself is fascinating enough to follow down the rabbit hole.

Water-powered or water-engined are the wrong terms for this. What’s being proposed is a system that replaces the chain, belt or shaft drive to the rear wheel with a hydraulic system that uses water pressure to spin the back wheel. So a fluid drive is probably the better way to put it. Designer Maxime Lefebvre admits as much in the “engine breakdown” slide, saying “to be effective, it needs a water pump.”

That water pump would be the engine. But how realistic is it to think about a water drive system? And what would be the pros and cos of such a thing? Perhaps we can look to two previous New Atlas stories for answers.