Restoring a 1935 Aeronca C-3. The rigging instructions to set the tension on the flying wires something like this. Pin center lengths of 125-1/8 inches equals 800/1000 pound load on the wire. Using a formula I was given (T=PS/4D) were T=wire tension in pounds, P=scale pull at the center or the wire and S=length of the wire, i'm getting 15 lbs. of pull on my scale. This seems to low to me.