Flexifoil wobbles on my nerves
Subject: Flexifoil wobbles on my nerves
From: email@example.com (Steve Thomas)
Date: Sun, 28 Feb 1993 01:47:34 GMT
In article <firstname.lastname@example.org> email@example.com writes:
>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.
You probably have sand or dirt inside the sail. I had some sand indside one
of mine once and observed the exact same behavior.
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