Is there some kind of aerodynamic formula for the size of these winglets. For example 10% of wing area. Or do you just kinda add what looks cool.
One question I have is with a short coupled plane (short fuse length) what does that do to the aerodynamic formula for total area for tail feathers? Does it stay the same? I would guess that it should increase somewhat to provide yaw stability.
Another question I have is why do I keep reading that everyone uses either packing tape or nylon to cover their wings instead of fiberglass? Is fiberglass to brittle? To expensive?