Using flaperons for pitch control is about the same as elevons on a flying wing. I have used both flaperons opposite to the elevator for more lift and tighter turns/loops and as spoilers, going the same direction as the elevator. These give some very nice elevators and elevator landings.

A few weeks back my buddy and builder were in between projects and I had this old, beat-up Extreme 330. We decided to make it into a flying wing using the ailerons as elevons. He sawed the stab off and mounted my old OS .61SF fairly far out on the mounts. You need a CG at 10%-12% back so everything has to be shoved forward. The battery and rudder servo are up under the tank. We used old servos and receiver, nothing that would be a big loss.

He was skeptical as to whether it would fly, but has has made some weird planes that I have flown so I felt he would do OK on this one. I set the elevons slightly up. Actually, I followed the under side of the airfoil. You need some reflex in the wing for pitch stability.

I lined up and added about half power for take off. It lifted off and went straight as a string. No pitch wobbles, no roll problem. Flaps (my buddy) is saying, "I don't believe it!" It was flying like a trainer. I did have the controls cut way down from 3D flying. I put in a couple of flights, proving the concept. I did get some rudder flutter on the second flight when I added full power for a vertical 8, but you can't fly a 3D plane fast so I figure that was due to the large controls and going too fast and not to being a flying wing or tailless plane.

Bottom line: the plane was really too non-eventful, very easy to fly so it was a successful project.