Flexifoil wobbles on my nerves

• Subject: Flexifoil wobbles on my nerves
• From: martin@patricia.verfahrenstechnik.uni-stuttgart.de (Martin Hepperle)
• Date: 27 Feb 1993 16:27:23 GMT

I have a rather small FlexiFoil kite (approx. 80 cm span) which
does something I don't like:
It does not keep it's angle of attack constant, but "wobbles"
up and down when the wind load is getting stronger.
The frequency of these changes in angle of attack is about 5-10 Hz.
To me it looks like separating flow at higher alfa -> lift is
dropping -> reduction in alfa -> flow reattaches -> higher alfa ->...

Is there a trick to avoid this (adding lead to the lead-ing :-)
or trailing edge or something like that) ?
The larger FlexiFoil seem to have no problems with this phenomen.

Martin.


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