Not for the first time, I am drawn to the French Mauboussin M.40 Hémiptère tandem-wing single-seater as a possible inspiration for a homebuilt design. The original used an interesting combination of elevators on the front and rear wing acting contrary to one another but only the rear ones acting as elevons. It seems to me that a simpler arrangement would be to use the rear wing control surfaces alone as elevons, freeing up the front surfaces to act as flaps. A spring bias mechanism in the control system or movable tabs on each wing connected to the flap lever could be used to counteract the pitch change due to deploying the flaps, effectively pushing forward on the stick automatically. What would be the pros and cons of such a system in a tandem wing design? Cheers, Matthew
