Definition: Combining the function of ailerons and elevators into a single set of control surfaces, elevons are found on Delta wing style RC aircraft. On this type of aircraft the wings are enlarged and extend to the back of the plane. There is no separate horizontal stabilizer where you would find the elevators on conventional straight-wing aircraft.
When the elevons are both up or both down they act like elevators. With both up, the nose of the airplane goes up and the aircraft climbs. With both down, the nose of the airplane goes down and the aircraft dives or descends.
When the elevons go up and down opposite of each other they act like ailerons. Left elevon up and right elevon down -- aircraft rolls to the left. Left elevon down and right elevon up -- aircraft rolls to the right.
Elevon Control on an RC Transmitter: For diving and climbing, use the elevator controls -- typically up / down movement of the right stick. For rolling left or right, use the aileron controls -- typically left / right movement of the right stick. Other configurations are possible.
Examples:
When your RC airplane is flying toward you, the elevon controls appear to be opposite when you're doing rolls to the left or right. But if you imagine yourself as a tiny pilot inside the RC you'll see that pushing the elevon control stick to the left turns the plane to the plane's left, even if it appears to be to your right as you stand watching it come toward you. With practice, you get used to it.
