For The F power pack i would say about an 80-90cm wing span..... so i would do 70%
I'm going 60% on an F pack. What is it that constitutes a Turbo Sig again? Here is what I am planning.
30" (760mm) smooth airfoil wing, no dihedral, flaperons.
Contouring the nose inward to make it a little more "slippery"
A 2206 2800kv spinning a 5050 prop.
Larger control surfaces and large throws.
Should haul the mail and be acrobatic.