angle of elevons on a delta flying wing?
 

Hi, I am building a large delta flying wing, and would like to angle the elevons slightly, to create a shape similar to a B2 ( though not that closely similar...). My question is, to avoid adverse effects, is it better to have the elevons angle back, so to speak, so that the chord where the elevon is nearest the center line of the plane is larger than the chord where the elevon is nearest the wing tip? Or vice versa? It seems to me in a turn, the down elevon would drag more, and therefore having the chord be larger at the center would create yaw in the right direction. I am clearly not educated in aerodynamics, but I do get the basics. Any help?

Thanks!!

angle of elevons on a delta flying wing?
 

The "angle back" typically seen on a wing is due to the change in wing thickness as the span increases, as much as anything.
It's easier to do the manufacturing of the parts. The percentage of the chord of the surface relative to the airfoil at that point remains constant, while its actual chord diminishes out along the span.
On a model, it probably doesn't add or subtract anything from the perceptible performance to have them tapered as per full-scale or constant chord ..... easiest.
Unless you are looking for full-scale similarity, of course.
The most likely problem is too much deflection creating unneccesary drag or too-active a response.