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Hi it's not magic it's a fact if you care to look back at RC models from the past that were single channel rudder only they have a lot of Dihedral without it it will not turn with respect I have been building and flying models of one sort or another with varying degrees of success for some 40 odd years, I have read the varying degrees of success that those who have printed this model have had in trying to fly it and what they describe fits my opinion of the problem with this design,I am sorry if my criticisms upset you but that's what forums are for.