Mermaid Tails

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Mermaid Tails

Unread postby CHRISPI » Fri Dec 01, 2017 7:45 am

Ever since I saw toy mermaid tails that became fashionable with kids after moves like Little Mermaid. Also monofins used by free divers. I wondered how they would work with prone board riders. The streamlined enclosed legs tapering back to the fine area, may be with a caudal keel between the heel area .Getting into the water may be a problem. The site of me hoping into the water in a pink sequined mermaid tail may be a site to see!! . Getting used to the restricted leg movement could be disconcerting at first .But it would make a very interesting experiment has it been done. Have I gone to fare past the edge again?
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Re: Mermaid Tails

Unread postby bgreen » Sat Dec 02, 2017 6:12 am

Not sure about the sequined outfit, but I may have seen a photo somewhere.

It would be hopeless on rocks and trying to enter/exit in heavy conditions. It would limit leg movement if you wanted to unweight one leg.

Have you gone past the edge, depends where the edge is. Probably, but who am I to say.
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Re: Mermaid Tails

Unread postby Nels » Sat Dec 02, 2017 5:47 pm

The bodysurfing group on yahoo poked around with the monofin thing a good number of years ago. I have zero memory of what came of it. Good in pools if I recall. My guess (and it's my guess only) is that the monofins I see today and especially the "mermaid's tails" kind would have unnecessary drag due to width, on top of Bob's observations.
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Re: Mermaid Tails

Unread postby CHRISPI » Sun Dec 03, 2017 4:54 am

The tapering profile from the trunk to the ankles is almost perfect .obviously the fin would be surf sized not the free diver size. And a step out off system like the hang glider, or Para wing systems, it would take some neural rewiring to get over the discomfort of leg movement restriction. But the improved drag model comparing a fish like taper to flailing legs is obvious??
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Re: Mermaid Tails

Unread postby GeoffreyLevens » Sun Dec 03, 2017 11:09 am

Step out of system would need to be designed so it remained locked on in a blender thrashing wipe out. Big fin area=lot of leverage the water will have to rip it off your feet
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Re: Mermaid Tails

Unread postby Wooddave » Mon Dec 04, 2017 7:50 am

If you are going to build something from scratch you might consider creating a two piece design that could separate and be used when needed, and lock together when you wanted to swim like a mermaid (who doesn't want to do that lol).
my venture into hydrofoils grew out of a hand-fin design i came up with for snorkeling and diving.
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Re: Mermaid Tails

Unread postby GeoffreyLevens » Mon Dec 04, 2017 9:08 am

Wooddave wrote:If you are going to build something from scratch you might consider creating a two piece design that could separate and be used when needed, and lock together when you wanted to swim like a mermaid (who doesn't want to do that lol).

Excellent idea! Just reach down and pop a lever of some sort for entry/exit of shore pound and rocky beaches. Of course needs to be very easy, one handed operation so you can do it in the surf zone.
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Re: Mermaid Tails

Unread postby Nels » Mon Dec 04, 2017 5:30 pm

For that matter you could just use a fin tether around one ankle and attach the other end around your other ankle when you get out in deeper water. Or some velcro strap. After all, you can mermaid/dolphin kick using regular fins without anything binding the two legs or fins...I used to do that doing laps in a pool with a kickboard.
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Re: Mermaid Tails

Unread postby GeoffreyLevens » Tue Dec 05, 2017 10:47 am

With entire working surface of fin(s) as single unit though, there is no chance of ankle rotation or loss of area from deformation. One big, slightly cupped surface maybe more thrust than 1/2 and 1/2 with split???
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Re: Mermaid Tails

Unread postby CHRISPI » Tue Dec 05, 2017 5:02 pm

This experiment needs somebody with a swimming pool nearby a workshop .The fin on the right side of Wooddaves display looks like it mite work. It has a good mounting surface to fit shoes or foot socket .Initially the fin would need some sort of pitch adjustment to find the best angle of attack
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