Rod,
I think that the biggest advantage of the diamond airfoil, is ease of construction. The stab has to be thick enough to contain the elevator servos, and be easy to build. An airfoil of this type can be built on a flat surface, without the need for any tabs, feet on the ribs or any other construction aids.
As far as the aero qualities, a diamond airfoil acts like a symmetrical section. (It is symmetrical)
The stab provides lift to counteract the pitching moment of the wing.


Are you going to Deer Lodge this year? Hope to see you there. Write me offline.

Harley Condra
BVM REP
RAM REP
Buy American!!!!!!