I think for water, what you really want is to _breed_ cavitation, but in a way w... | Hacker News

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nurple 12 months ago | parent | context | favorite | on: 'Underwater bicycle' propels swimmers forward at s...

I think for water, what you really want is to _breed_ cavitation, but in a way where the jets created by bubble collapse are arranged to face opposite your desired direction of motion. Kind of like Astrophage.

samplatt 11 months ago [–]

Cavitation for motorised propellors is to be avoided at all cost... a lot of engineering exists to do exactly this.

Cavitation is a destructive force and eats away at the edge & surface of the prop blades, making it VERY inefficient.

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