I’m about to embark upon my electric skateboard build. This question is about construction of the deck. Here’s my plan. I’m going to use multiple layers of 1/8" Baltic Birch plywood with multiple layers of carbon fiber between those layers (so the outer surfaces will be plywood with inner layers of carbon fiber, so n layers of plywood with n-1 layers of carbon fiber).
Each section of carbon fiber will have a layer of 6K tow running parallel to the board (which should add significantly to stiffness), and two layers of 5.7 oz cloth placed at 45-degree angles to the board for torsional rigidity.
There will be a thin layer of Purpleheart veneer on both outside surfaces.
I’ll use epoxy to bind everything together and will vacuum bag it all to get a high quality, low epoxy content board.
The board will be approximately 42" x 9".
Here’s my question for anyone with carbon fiber experience (I could guess). Should I use 3 or 4 layers of the 1/8" Baltic Birch plywood. If 3 will give me a stiff board, that’s what I want. If I have to, I’ll go with 4. I haven’t worked with carbon fiber before and so don’t know how many layers I should make the board. I just know it’s renown for its stiffness, especially the UNI.