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August 13 2022

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Yamaha and the Fluid Drive water-driven motorcycle project

A system that uses water to eliminate chains, move all wheels and other pros? Fluid Drive. The water bike in Yamaha's conceptual viewfinder.

Gianluca Ricciodi Gianluca Riccio
in concepts, Transportation
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Yamaha and the Fluid Drive water-driven motorcycle project
August 10 2020
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A while ago, in 2016, a study (later also the subject of a presentation) sponsored directly by Yamaha has feared the development of a road bike moved directly with water. Fascinating idea, which in the meantime has attracted speculations and concepts.

Fluid Drive, Yamaha water bike
Fluid Drive water bike, an operation diagram

However, water-powered and water-engineered are wrong terms for this study. Water bike, or Fluid Drive are more correct. Because?

Water does not replace fuel, it is not a water bike in the sense that it is powered by water, but it is a water bike because it is driven by water. Fluid Drive, in short.

What is proposed is a system that replaces the chain, belt or shaft drive of the rear wheel with a hydraulic system that uses water pressure to spin the rear wheel.

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Guided water bike

What is the best definition, then? Driving to water? The designer Maxime Lefebvre try to develop the concept by visually showing some kind of engine replaced by a water pump.

That water pump would be the engine. But how realistic is it to think of a water-based Fluid Drive system? What would be the pros and costs of such a thing?

Fluid Drive, technical tests already carried out

Fluid Drive, Yamaha driven water bike
Ferox Azaris

In 2018, the working prototype of the Ferox Azaris, a vehicle equipped with Fluid Drive technology capable of running as many as 6-wheel drive. Ferox claims it operates at 98% volumetric efficiency, which means the drive wheels can deliver torque with immediate response when pressure is pumped into the system.

Azaris proves that this drive system offers extraordinary flexibility in the positioning of the drive wheels. And because it weighs about a third, it could end up fitting even on the end of a swingarm.

Fluid Drive, Yamaha driven water bike
2x2x2 by Ian Drysdale, each wheel houses a hydraulic motor

Indeed, as the extraordinary motorcycle demonstrates 2x2x2 by Ian Drysdale, smooth transmissions can spin the front wheel just as easily as the rear, opening up the potential for 2WD motorcycles.

Yamaha, of course, has already tried it with the innovative 2-Trac dirtbike, as well as some rather wacky concepts in the early 2000s.

Fluid Drive, water driven motorbike

Fluid Drive, Yamaha water bike

Two-wheel drive, no more chain drive, mid-engine option: Fluid Drive can have many pros.

And the disadvantages?

Currently there are some. To the point that I find it difficult to use similar technology in the short term for high-speed vehicles such as such motorcycles.

Lefebvre's vision, however, fascinates because. It shows a perspective in which, solving the structural problems of this technology (I have seen worse challenges), a water-driven motorbike shows itself in all its beauty.

And the charm is there.

tags: watermotorcycle
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