04.12.2014, The Oz Report
http://willswing.com/blogs/PilotBlogs/tabid/38/BlogID/5/Default.aspx
New gliders do not flutter at Vd dive speed however older sails
will invariably begin to flutter at much lower speeds. Fluttering will sometimes
progress from a short-intermittent buzz at high speed to a debilitating and
persistent beat at much slower gliding...
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