Chris,

Flaps aways go down on RC airplanes. They start at neutral with the 3 position switch in what I will call position 1 (normally all the way up or towards the front of the radio). In position 2 (middle position) the flaps would be half way down. In position 3 the flaps would be fully down. You will have to experiment with the angles of the flaps in the mid and full down positions. Also, most of the time you do not use the flaps during take off.

By the way, the flaps work in the opposite direction of the elevators. If you look at some of the control line stunt planes, they have flaps on the wings that are linked to the elevators. When up is applied the wing flaps go down and the elevators go up.

George