The elevator is what pitches the nose up or down. Elevator up, nose up etc. The flaps are used to generate more lift to the wing, by increasing the camber of the airfoil. So combat models do not need flaps, as they rely on very light wing loadings to achieve the tight turning ability. A bigger, heavier stunter benefits from flaps in the hard corners. This is a simple explanation, and the are more complicated aerodynamic issues at play here, but this will make it easier to understand. Do not confuse the flaps with the elevator, they do completely different things.
On the flying wing type of combat model, popular in Russia etc, the little flipper on the trailing edge is the elevator, not the flap. Because these models have a very short tail moment. This may have been another area of confusion.