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Old Oct 02, 2012, 10:40 AM
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rayonnair's Avatar
Singapore, Singapore
Joined Jun 2012
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Help!
Torsional rigidity in EPP KFM-airfoiled flying wings

Hi guys,

I did a search on the forum for tips to increase torsional rigidity in general and more specifically in an EPP KFM flying wing. What I found was:
  1. Rigging (not really practical on wings)
  2. Strapping tape (difficult to work around the stepped edges of a KFM airfoil)
  3. Covering film (KFM airfoil goes bye bye)
  4. CF (not sure where to lay the CF to get the best results).
So... any ideas or tips as to how I can make an EPP KFM flying wing more rigid in torsion? I guess there is always option 5, ignore it and don't fly too fast, but I'd like to leave that as a last resort of course .



Thanks in advance!
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Old Oct 02, 2012, 07:56 PM
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USA, NC, Huntersville
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Quote:
Originally Posted by rayonnair View Post
So... any ideas or tips as to how I can make an EPP KFM flying wing more rigid in torsion? I guess there is always option 5, ignore it and don't fly too fast, but I'd like to leave that as a last resort of course .


What size wing are you talking about?
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Old Oct 02, 2012, 08:34 PM
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1m span! Small-ish.
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Old Oct 02, 2012, 09:15 PM
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Here is the bottom of my 42" Divinity wing. I just added a small spar across the middle of the span to hold it together after several crashes. Before adding the spar, the wing would start flapping during a dive. It really helped strengthen it a lot. You could add spars to each leading edge (where my led strips are) and one across the middle and it should help tremendously.
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Old Oct 03, 2012, 12:53 AM
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Cool, thanks. I'll add a spar like yours.
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