by Xanadu » Fri Feb 19, 2010 11:37 pm
Dihedral is the amount the wings are angled toward one another, as opposed to being flat right across from side to side.
Imagine taking a flat sheet of paper, then folding it in 1/2. The unfold it.....you will then see the paper does not lay perfectly flat again, the two sides and angled a bit. That angle is dihedral.
The joint mentioned is the section where you are joining the 2 wing halves together during the build. Its telling you not to glue the wing halves together yet, just build the 2 wing panels flat first because later you will be lifting one wing up at an angle to the other and then gluing the 2 panels together. Thereby you put a certain amount of dihedral in.
Make sense the way I explained it?