Quote:
Originally Posted by octpora
Has anyone ever used or designed a sideways monofin that anyone knows of?
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Well, I did not see such monofin yet (though would love to add it to my
Collection of Weird Fins), but guess that human body is not quite well suited for the sideway propulsion. There are though several fin concepts for handicapped divers - if you have a look at the above linked collection, there are couple of them, though none of them is a monofin. For example the
Farallon Fins have a fixation on shins, and was designed exactly for people like you having problems with ankles. This concept would be certainly usable with a monofin too.
Also other fins are fixed on the shins - the
Shin Fins, or the
Freedom Fins. Also the currently discussed
Aqueon, which in its concept comes closer to a monofin, does not put any stress on ankles. The there are some fins for breast stroke - like for example the ones from
Speedo. Or the
Liquix hand fins may be of an interest too, though they may be difficult to use while spearing

The
Velosub is another propulsion device that may be interesting for people with some injuries unable to use regular fins.