Flap mechanisms for RC aircraft


    • Thad
    • October 27th, 2009

    I've used XFoil for airfoil design, but it only does single element airfoils. Are the similarly simple, public domain tools for multi-element airfoils as shown in this article?

    • Karoliina Salminen
    • November 11th, 2009

    The problem is that there are no public domain tools for this. I proposed this feature to Andre Deperrois (maker of QFLR5). He said it would be a lots of work to add it to the wing simulation of QFLR5. However, I would feel that it would worth it.

    • gravityloss
    • November 11th, 2009

    In QFLR5, theoretically you could put the tail right behind the wing to simulate a fowler flap, or use the biplane option to put a second wing.Results I don't know much of.NACA has done quite a lot of wind tunnel tests in the forties with flaps for example so the free papers from NTRS (ntrs.nasa.gov) are a great source.

    • Goeland
    • November 24th, 2009

    Also these particular flap designs aren't in use on most RC models – I fly RC planes myself.The only planes you'll find these multi-panel flaps on are scale models, meant to mimic full-size planes completely. As far as I know for RC planes (and possibly small full-size aircraft) a single panel flap is better because of less dead weight and stronger structure. This, at least, is completely true on RC aircraft with a wingspan under 3.5 meters, and on almost all sailplanes which use laminar foils with trailing edge camber variations.I believe that using the biplane option in QFLR5 as Karoliina suggested might just work adequately enough to be accurate.

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