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In a delta wing aircraft, how do elevons help in doing roll and pitch?
In order to move the plane in the two directions, the elevons can work in two different ways. In order to control the pitch, the elevons work together, and either all go up, or all go down to mimic elevators. In order to control roll, they work differentially, or going the opposite direction of each other, just like with ailerons on a conventional airplane.
We don’t have an animation of a delta wing aircraft, but it works the same way as in this animation of a conventional wing aircraft. A conventional wing aircraft uses separate elevators and ailerons. Elevons are a combination of the two.