Elevons are elevators that act both as elevators and ailerons. Most commonly used on flying wings but also common on aerobatic models that need their control surfaces to be very responsive in low wind speeds or prop wash alone<hovering.> Also elavons are commonly used on jets. Particularly F-16's one because if you've ever seen elevators on a jet more that likely they were HUGE. 2 because Jets normally opperate at higher airspeeds they do not need as much control surface as our slower aerobatic models. As a matter of fact issue 5 of Fly R/c has a F-16 turbine model with only elevon to control the pitch and roll axis's.