As I have no experience with elevons, am I correct in assuming they work much the same as flaps, in other words, when they are reflexed downward, they increase lift? If this is the case,
how do they behave in two scenarios: (1) rotation at takeoff, as with a tri-gear setup, and (2)
flare upon landing? My mind tells me that rotation at takeoff would require UPWARD relex of the elevon as is the case with conventionally-tailed elevator design. I'm interested in building a Bill Evans Simitar Slow Motion as my first wing. I hope someone can clear this up for me before I lose my mind!

I have read a few threads on wing designs, and am led to believe that they dont really rotate
upon takeoff but rather "lift off" in a rather flat attitude. Is this so?

Also, is anyone familiar with this design? It has a 60 inch wing and only a .15 for power, and have been led to believe it's relatively fast nonetheless. What about that?

ANY replies to this might help me sleep tonight........Crow

You've got it backwards. They act just like elevators. The elevons both go up and the model rotates to raise the nose just like regular elevators.

The references you found to "flat liftoffs" are flights of fancy unless the landing gear holds the model at a positive angle that is high enough to generate the lift. A "flat" stance would still require up elevon to rotate the tail down and the nose up.

Now go to sleep....

Bruce: Thanks, the mystery is solved. Now I can move on. I half-XXsed figured it out myself last night reading other forums wherin they discussed removing the elevator from a standard config. and moving the c.g. Your input confirms things. I'm grateful....Crow

I did not see any reference to the aileron function in the above. Elevons also have the capability of having one move up while the other moves down to create a roll effect as well as both moving up and down simultaneously to provide elevator or pitch effect. You do need an transmitter that has the mixing function built in or you need to instal a mixer in the plane that properly mixes and coordinates the aileron and elevator inputs into elevon inputs.

Rod- thanks! I'm clear on the mixer, just had a mental block on the other. Thanks again....Crow