Yup Flypaper 2 .. I would also thingk that weight and drag would influence the incidence too .. thats why aerodynamics get too complicated for me. Perhaps that helps answer one of your questions Don. "Can a model with a scale airfoil use a scale amount of incidence" yes ..if everything else is scale ..which is unlikely. So what to do... me ...Id pick the most characteristic incidence on the aircraft and adjust the other factors so it flew in the correct attitude. By that..I mean if the main wing incidence was the most prominant feature ..example the Bleriot .. I would use its scale incidence and try to trim the model by adjusting the stab and downthrust etc. With my Fokker DVII .. I set the stab and altered the top wing incidence as it wasnt so noticible .. only my 2 cents worth and as stated I know little about aerodynamics so could be wrong