### Why do I need wing tips on my flying wing?

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

• 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.
• Perfect. Thanks Gary
• Moderator
Heres some good starting points

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

http://fwcg.3dzone.dk/
Basic Design of Flying Wing Models
This reply was deleted.

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