P77,. .At EGCC [at least] they work 24/7 the windsocks, [all FOUR of them] ARE illuminated at night <img src="wink.gif" border="0"> . .As to how they work:- <img src="confused.gif" border="0"> . .Wind blows through a [calibrated] fabric tube.. .So,you are not "really" interested...0-5kts . .Not a "lot" happens.. .But at 5-10kts, the "tube" starts to 'stiffen',so a "little" bit more interest.. .11-15kts, a "lazy" lump <img src="wink.gif" border="0"> , and it is "starting" to get interesting. .16-25kts, a "real" stiffy
. .we aim to please it keeps the cleaners happy. .Above that, I really daren't say <img src="rolleyes.gif" border="0">
[ 26 February 2002: Message edited by: chiglet ]</p>