Quote:
Originally Posted by k.smith459
i'll change the wings Dihedral to 1 degree and leave it at that....
Posted from the Dreamfactory
Keenan

For a DS plane you are better off putting the wing and zero and the tail plane at 1*.
Many people put them at 0  0......0 degrees longitudinal dihedral and then use elevator trim to trim the plane.
To optimize the rigging you want to first calculate the planned DS speed objective, then calculate the circle circumference for your site. Using this you can calculate the gload on the wing for your approximated glider mass. Using this you can calculate the required CL (lift coefficient) of the wing. Then using your air foil and planform you calculate what AoA the wing must be at to generate the required CL. The wing would be put at this angle compared to the zero lift line of the fuse. The pitching moment of the wing at this CL would be calculated and the stab would be positioned at the correct AoA to counter the pitching moment of the wing (this is variable depending on the CG).
In the end the whole calculation is an approximation because changing the CG or ballast would change the optimum rigging.