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Hi Adam,
Last time I went to my dark sky club site at Linden, there was a substantial gusting wind running at about 40-60 kmh which picked up folding chairs etc and a couple of times, when the scope (12 inch collapsible Skywatcher) wasnt being held by me, it was pushed around on the azimuth bearing by the wind.
Not much mind you as there is less "sail area" as opposed to a solid tube, but as it was on a purpose built stand (a 4 x 2 box to raise it higher) I made sure I held onto it when the big gusts came in case it blew over.
Its certainly true that any strong winds make observing a nightmare, too much vibration to make it worthwhile, not to mention a pain to keep the object in view.
Obviously the bigger the scope, the heavier it is and therefore the more stable in medium to high gust winds, but generally, windy conditions dont make things enjoyable.
Cheers
Chris
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