Just listen to the difference between a traditional propeller made of blades and a new propeller made of loops. It's a win-win-win for the oceans, the climate, and the shipping industry. This story is part of our GainsInGreenTech series.
Much of this underwater noise comes from ships' propellers. But it's not from the mechanics of the propeller motors — it's the physics at the tips of the propeller blades.That's why engineers like Tommy Sebastian, a senior staffer at MIT Lincoln Laboratory, are tinkering with unconventional propeller shapes.
Sharrow Marine is working to adapt its closed-loop propellers for different types of boats and ships.As a boat propeller spins, it creates similar high- and low-pressure regions in water as a drone propeller does in air. These pressure changes create cavities of air that form bubbles. Sharrow said his loop-based boat propellers are about 20 decibels softer than traditional propellers because both tip vortices and cavitation are"eliminated or significantly reduced."
Sharrow began selling propellers to recreational boaters in 2020 through a company he founded called Sharrow Marine.
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