wojtepanik (11/12/2013)

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Hi 
I have some experience in diving, so I wouldn't make cf fin, I would rather hit maybe one layer of cf and then multiple layers of kevlar or use only carbon/kevlar. The fin should have some flex so use rather polyester I would say. You don't need it to be stiff actually. I would not recommend here using soric etc. as it would be to stiff. I have some nice idea for ultralight fins, if you are interested just write here, because I will have to make some drawings etc.