I was talking to some folks about building rudders and daggerboards and the question came up how many layers of graphite fabric would be right and the ounce rating. I have seen ounce ratings from 5.7 to 10. It appears your first layer would be fiberglass cloth then with 1 or 2 layers of carbon fabric. Join the 2 halfs and fill with expanding high density foam. I am planning on building a rudder for a F28.



What kind of techniques are used to join the halfs?