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Stefan,
most composite fins have a tendency to decompose.
Traditional designs like Beuchat,Scubapro,Poseidon Jet/profins Barakuda
Gigant, Propuls, seem to win in the end.

Split and other stuff means risk of entanglement in lines, that is why
serious people use tape to minimize protruding edges.

If you really care about efficiency, care about pure glaassfibre resin
reinforced fins. These may be homemade out of freediving fins, probably
with a slightly shorter blade.

Gas comsumptions with this kind of fins drops by 15 %, as compared with
other fins commonly regarded as efficient.
Matthias

> Stefan Bolka schrieb:
> 
> Ok this is probably gonna get me hurt but...
> 
> Has anyone thought about the natures wing, i.e. scubapro twin jet fins
> or Apollo bio fin for DIR.  I ask because I recognize that many of us
> (like me) do not have scooters and the test numbers showing better
> efficiency sound encouraging.  Do these work for frog kicks?  Could
> they be used for tech. and not cave or cavern?
> 
> I am asking because I am trying to start making a "DIR approved
> equipment list".  yes I have too much time on my hands and figured it
> makes sense to try and help new divers get into DIR methodologies so I
> am working on a FAQ.
> 
> If anyone has start a FAQ and not finished let me know, I'll help
> finish it.
> 
> Thanks for the help,
> Stefan.

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