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Daniel
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Hi everyone..! I'm new here on this forum... Also I'm new in composites world...  My idea is to make carbon diving fins in mould with two sides with vacuum infusion. (dim. 20x70cm). In first few trys I used glass fibre and I had some "holes" without resin. Now I know the choice of resin was wrong....My next try will be with carbon reinforcement and infusion epoxy resin.From this point I need suggestions about tipe of carbon..(thickness.. UD or TWILL... or combination...) Fin have to be strong and shiny from both sides... Mould is made from plexyglass.
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Matthieu Libeert
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Nice to have you here! Do you have some pictures? It could make it a bit easier to help you...
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wojtepanik
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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. Bye! Wojtek from Poland Advanced Open Water Diver lol Ps. If you want to be pro diver you should prepare your own tank for air made out of carbon 
~~~Everytime I hear sound of demoulding part I have eargasm~~~
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Zorongo
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Unidirectionals will give a flater surface tan a braided cloth if gel coat is not used.
If you use two unis, you may change orientation in order to control stiffness.
I mean: from 0º most stiff, +/- 60º, +/- 45. or whatever intermediate you need in order to reach a comfortable fin...
As Wotjepanik mentioned, a fin too stiff will be a mess for the diver.
Cheers !
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Daniel
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Here is photo of my last try... You can see the hole without resin...
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Daniel
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wojtepanik (11/12/2013)
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. Bye! Wojtek from Poland Advanced Open Water Diver lol Ps. If you want to be pro diver you should prepare your own tank for air made out of carbon Yes off course I'm interested! Please put some drawings here...!
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Daniel
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Zorongo (12/12/2013)
Unidirectionals will give a flater surface tan a braided cloth if gel coat is not used.
If you use two unis, you may change orientation in order to control stiffness.
I mean: from 0º most stiff, +/- 60º, +/- 45. or whatever intermediate you need in order to reach a comfortable fin...
As Wotjepanik mentioned, a fin too stiff will be a mess for the diver.
Cheers !I tryed with UD. Position is down the fin but at the and I cut it on 45 degrees... That help that the fin is in 1/3 soft and in 2/3 hard... Not too hard...
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baja_patient
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Sorry, but from that picture I have no clue what that is supposed to be? A diving fin, as in the ones for your feet? I have seen those split cressi sub ones, they are supposed to be some of the best, and they flex, because they are plastic/rubber.
Not sure why you would want to make them from glass/carbon/kevlar?
Did u infuse the item in the picture? what layup did you use? because there is no infusion mesh, which most likely caused your dry spot.
cheers
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Daniel
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Group: Forum Members
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Yes, that' the fin... without rubber part for the feet. On the picture is infusion of the epoxy in mould. I have to have both sides shiny, so the plexyglass mould is from both sides. In that case it's impossible to use infusion mesh. Problem with dry spot is caused because thick epoxy resin. I have to change it... I want to make them from carbon because it's light and strong. Also, I can affect to thrust and the point of flexibility Al my tests until now are with glass... (because of price in testing phase). Firs layer is 80g then two layers of 400g UD cuted diagonaly, and again 80g. That was material which I had... just to test if I can make infusion right and if I can get shiny both sides. Only problem is that dry spot. Now I'll change the resin type.... Im not shure about type of carbon which I have to use in final product... First idea is 4 layers... 200g Twill + two layers of 150 UD cuted diagonaly + 200g Twill.... Please advice...!
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jeremy tom
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