I've just done the sizing calcs for my 12m tower with a 3m mill on it - its scary when you add in the 'once in 25 year' winds of 150km/hr we have here. The stresses shoot up to 950kgs and that is without considering angle of the guys.
I've decided to go with a wire rope that has a 300kg working load and breaking strain of 1.5 tonnes and if I end up with them stretched in a storm then so be it - at least I hope to still have something in the air and not cutting stock in half in the paddock!!
The most I've actually measured here on a 5 minute average is 68km/hr which is quite bad enough - hard to stand up in and that wasn't even during a storm!!
I'm looking forward to seeing what our average (I can't sleep with all the noise) spring winds get up to with my new anemometer :-) See here for a bit of background to our weather.
Robin - Down Under (or are you Up Over)
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