I imagine the airfoil in the application and fly it in my mind. If I need an airfoil of a type I have never used before then I pull out my airfoil books and look at drawings. For example, I may thicken it to slow the model or make the leading edge radius smaller to allow sharper stall maneuvers. For a new design I adjust the airfoil to behave more how I want it to on the new model. I have airfoils that I've used on previous models so I know how they behave. I almost never use a real airfoil in my designs. +++++++Don't get hung up about it.++++++++ If you can't decide then copy an airfoil in use on a model and scale it to the right size for your model. If you want to design unique planes that fly for fun, then stay in the realm of reason and make your airfoil close to the shape of airfoils used by other planes of roughly the same type. Note that there will be a huge difference between any under-cambered vs. Again, I'm comparing airfoils that are basically the same shape within a family. The difference won't be something like one airfoil is "right" and the other makes your plane loop back into the ground on take-off. The difference may be that the 14% version flies and lands a little faster, but is smoother whereas the 16% version may perform aerobatics in a slightly smaller volume. If a designer is agonizing over whether to use a 14% or 16% symmetrical NACA section he can choose either and the plane will still fly well. These behaviors are not different enough to cause any problems in your design unless you do something like change a round leading edge to one that is razor sharp. We learn from experience knowing that the subtleties between one airfoil and another close to the same shape will make a very small difference - one that would only be noticed by an expert pilot.
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However, if you enroll at a school of Aerospace then you can probably get help there.Īlmost nobody who designs model airplanes would have a clue how to pick an airfoil for their design based on real airfoil data. If you are purpose-building something competitive that requires the best possible airfoil for the application then I can't help you. That may not always be true, but it's a good rule of thumb. However, the airfoils should scale down comparatively.įor example, if one airfoil is tested to stall sooner than another airfoil, then the stall speeds may be much different when scaled down but both airfoils should still stall in the same order. +++++The airfoils are tested at larger sizes than the average model and things change as size changes. ++++Data on real airfoils won't apply in our realm anyway. By "real" I mean an airfoil that has been designed and tested by the aerospace industry. The most commonly used airfoils for flying model aircraft are:Įach family encompasses a large selection of airfoils but we use very few of them due to habit or not having a clue about how to properly select a real airfoil.
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