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In determining a suitable flap deflection angle for take off I am trying to come to a conclusion about the angle of attack for take off first. I have read that the highest lift to drag ratio is most desirable and for the NACA 4415 this is around 8 degrees. So I am just wondering if this would be an appropriate angle for me to carry out analysis with varying flap deflection angles with or if there is a better way to go about it. My analysis is being done on Xfoil.

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  • $\begingroup$ Hi; not sure what is your exact focus with the analysis of flap angles for T/O in relation to the AoA; perhaps you can elaborate with more detail. Is it only the airfoil you are analyzing, or do you already know the parameters of the total structure? It seems to me that if you would like to know to some degree of precision the AoA for take off yet that is what is determined by the airfoil (in addition to other parameters), i.e. knowing what flap angle will be set. Also, take-off itself has several phases so perhaps you can point out which one(s) do you want to analyse $\endgroup$
    – ivanantuns
    Dec 9 '20 at 17:15

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