Originally Posted by Hornetnz
You *could* also do a elevator to flaperons mix on a switch. Double elevators! I tried this with my EF 48" Extra for extreme walls.
That can make a big difference in the air with a delta but I doubt it would help with the handstands on the ground. The lever arm of the ailerons acting as elevons (not flaperons, which go the opposite way) is much less than that of the elevator. Even more important, the elevator is in the propwash, while the ailerons/elevons are not. So no action when not moving fast.
A setup using coupled elevons and elevator (both moving in the same direction) works well on Polaris and should also work on Mako to enhance pitch control in the air. In both cases you have a delta wing with the trailing edge well behind the CG.
The setup on an Extra is quite different, as the control surfaces on the normal wing are quite close to the CG. Hence the result of flaperons (which go down when the elevator goes up) is to increase camber and thus lift. This setup was widely used on control line stunt models and allowed "square" corners to maneuvers.