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'Underwater bicycle' propels swimmers forward at superhuman speed

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Re: 'Underwater bicycle' propels swimmers forward at superhuman speed

#91
post #27

> The nominal mode enables motion through the water at 3.6 km/h, and for speed-seekers, the SEABIKE can reach a maximum of 7.9 km/h – much faster than normal swimming speeds or even flipper-assisted swimming. https://www.nauticexpo.com/prod/seabike/product-68606-564117... Pretty fast, but "superhuman"? For short distances Michael Phelps can swim faster :)

Michael Phelps is an alien..

Incorrect, he is an evolved dolphin.

Re: 'Underwater bicycle' propels swimmers forward at superhuman speed

#92

Cool. More like an underwater 'monocycle', though. Make it into a full body struct in Y shape acting as kind of both 'guidon' and secondary propulsion axis -- more blades, an underwater tricycle. :)

Is a Monocycle something different to a Unicycle?

Apparently! I did not expect such a nice find after asking search engine this:

https://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=1700041

> There are two main types of single-wheeled vehicles. In a unicycle, the rider sits above the wheel. These vehicles are recognizable by most people. Less well known is the monocycle, where the rider sits inside the wheel.

Re: 'Underwater bicycle' propels swimmers forward at superhuman speed

#93

It’s obscure but there was such a contraption trialled by the seals and cia in the 1950s http://www.hisutton.com/CIA_Water-Air_1958.html Here’s a pedal powered smuggling submarine from the 1940s http://www.hisutton.com/Swiss-Pedal-Powered-Smuggling-Submar...

Interesting that the CIA conclusion for a device very similar to the article is "Not recommended for operational use due to its discomfort and very slight gain in speed over that of a swimmer equipped with fins."

Re: 'Underwater bicycle' propels swimmers forward at superhuman speed

#94
post #60

Earlier quoted context omitted.

Two propellers spin in different directions might solve it I guess

That will counter the rotational force, but not the transversal up your butt.

Maybe design a pogo-stick-like action, pushing with both legs together?

Re: 'Underwater bicycle' propels swimmers forward at superhuman speed

#97
post #49

I swim because I enjoy it, not because I'm trying to get somewhere fast. This seems awkward and I bet you have to use your arms just to counterbalance the twist you'd get on each 'stroke' of the leg. So even though I think it's goofy, I bet I'd like whoever came up with this. Someone who put a ton of effort into building something they thought would be interesting despite a thousand people telling them it's goofy. Go…

Balancing this device must have been a good problem to solve! All I can think of is “where does the other end that stick go?”

[deleted]

Re: 'Underwater bicycle' propels swimmers forward at superhuman speed

#98

What's the advantage of this over foot fins?

I can think of a huge one.

I live near a fairly dangerous ocean in SF where I’ve gone bodyboarding with a wetsuit and fins. I’m concerned that, if caught in a current, fins are not enough to propel me out of it.

This would. The extra power and ease of propulsion could make all the difference.

Re: 'Underwater bicycle' propels swimmers forward at superhuman speed

#100
post #86

Seems prime for attaching to a surfboard

I was thinking freediving as it requires less energy than flippers though I’m not sure the decreased maneuverability of having the thing attached to you would detract from what you are wanting to do when freediving. The article does say you can dive with it, though the devil is in the details eg how easy is it to turn around? I suspice it’s not nearly as easy as flippers

Another interesting use case would be just tossing one of these into a boat that you own, or a kayak or whatever. Basically extra insurance to get you back in case your motor dies or you get swept out, similar use case as the surfboard

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