If the plane has strip ailerons then DO NOT use a lot of flap or the ailerons will be ineffective. I learned this the hard way. If you have separate flaps and ailerons, set them up so the flaps work as ailerons, but the ailerons do not work as flaps except maybe for elevator flap mixing. Also, with the separate flaps and ailerons you can set up crow mixing. That sets the ailerons up and the flaps down which slows the plane down without it wanting to snap because you've put a lot of washout in the wing with the ailerons up.

Read a few paragraphs down on this page to learn a little about the hazard of flaperons.

http://www.airfieldmodels.com/galler...k_30/index.htm