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Why do I need wing tips on my flying wing?

Posted by george on September 28, 2009 at 12:20pm
Newb question I'm sure. I suppose it's for stability and to reduce tip stall. I guess my main question is....is there a good way to calculate how big a wing tip should be given a certain wingloading or some other variable? What's big enough for good stability and stall characteristics without being too draggy? I'm just thinking there's some clever formula someone knows.Thanks

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Replies

  • Bryan Cuervo September 28, 2009 at 2:08pm
    I;m guessing you mean "winglets", not "wingtips".The formula I used to calculate the winglet area on my tailless plane is:

    Area (per tiplet) = ((Span * Wing Area * Ysf) / Dcg)/2

    Where: Ysf (Yaw Stability Factor) = .018 to .022
    Dcg = Longitudinal distance between CG and 25% of tiplet MAC

    The Ysf of my plane is 0.018 and it flies fine.
  • george September 28, 2009 at 12:46pm
    Perfect. Thanks Gary
  • Moderator
    Gary Mortimer September 28, 2009 at 12:34pm
    Heres some good starting points

    http://www.mh-aerotools.de/airfoils/flywing1.htm

    http://fwcg.3dzone.dk/
    Basic Design of Flying Wing Models
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