hello
fins are very thin 3 or 4mm thick

Sounds a bit heavy! Have you thought about shaping some foam as a core to make up the thickness rather than just heavy glass?

depends on the area of the fin
I am using the 4-layer thin area in the 12 layers thick, glass fiber of 160 g

When I've seen fins they tend to have the fibres running at +/- 45 degrees (if your looking at the part from the side) so that in theory would make it stiffer in twist but have slightly more side to side flex, to be honest on a part like that though I don't think it will make a huge differenct to its performace, how many layers of the 160g are you using? you could like joe said alter the orientation on each layer to make the stiffness even.

hello is for making a surfboard fin
I am using 163g Light Weight Woven Glass
is that correct?

Hi,

Well, it depends on what you want to achieve, and which fabric you have. Is it unidirectional or bi-directional?

But for example, if you have 2*2 twill or plain weave carbon fiber, you can simply add a "rotated" layer of fabric. Say one layer at 0°, one layer at 45°. This way, your fibers will have 4 different directions. This would increase stiffness in two more directions.

But once again it really depends of what you need and what you have. Maybe you should explain us what you want to make.

 



 


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Importance of the direction of the fiber? Which is the way of doing?