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RC airplanes typically do not fly like their full scale big brothers. Reynolds numbers and all that... On top of that, your 12' wingspan model if 1/4 scale dimensionally, will not be 1/4 of the weight. The RC will be much lighter I am sure. Example: a 1/4 scale aerobatic RC might weigh 30-40 pounds while it's full scale big brother weighs 1200 pounds. Messing with airfoils is a waste of time typically when it comes to RC. A flat squared off chunk of foam will typically fly about the same as an airfoil shaped piece of foam in the lighter/slower realm of RC aircraft.
As far as flaps go, too much flap (area/deflection or both) and you get a nose down pitching moment. With an RC model, one can simply program in some nose down elevator mix to compensate. That said, the simplest way to add flaps on an RC model is to simply turn the ailerons into flaperons... In other words program the ailerons to droop when throttle is chopped and mix in a touch of nose down elevator as needed.
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German autos: '79 911 SC, '87 951, '03 330i, '08 Cayenne, '13 Cayenne
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Men do not quit playing because they get old.... They get old because they quit playing.
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