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Tower guy wires | 8 comments (8 topical, editorial)
Re: Tower guy wires (3.00 / 0) (#5)
by scorman (scorman@stny.rr.com) on Wed Aug 6th, 2008 at 12:36:37 PM MST
(User Info) http://www.greenpowertalk.org/showthread.php?t=6170

you specifically asked about the guy wire sizing:

I see a rating of 1400lbs working load for 1/4" cable ...considering that a 10 footer will probably not even reach 125lbs trust on the tower at any time, considering that at 25mph, the total thrust on a 10 foot solid disk is only 127lbs, but then add in the geometry effects for the angle from 40 ft up to 79 ...I can't see why you would want to hang extra dead weight at the far end ...makes it even harder to gin pole the tower up

BTW "guy radius of 42 ft " is the correct ballpark for 84-5= 79foot tie point ...2:1 is typical ...about 60 degrees give or take

Stew Corman from sunny Endicott



Re: Tower guy wires (3.00 / 0) (#6)
by halfcrazy on Wed Aug 6th, 2008 at 03:07:42 PM MST
(User Info)

Thanks stew glad to get the input everything is ordered heres what i went with
  1. inch inside diameter sch40 pipe for tower
  2. 1/2 inch sch 40 for jin pole
  3. /16 cable for top anchor point
  4. /4 cable for the other 3 sets


[ Parent ]


Re: Tower guy wires (3.00 / 0) (#7)
by scorman (scorman@stny.rr.com) on Wed Aug 6th, 2008 at 07:05:27 PM MST
(User Info) http://www.greenpowertalk.org/showthread.php?t=6170

three points:
  1. that gin pole is a "long slender column" ...needs to be supported in several places along it's length or it will buckle under compressive load
  2. always use a torque wrench ( click style is best) for all the cable clamps (rope clips) and three tweaks ...first, second, back to first ...too easy to tighten one side and the other can come off with your fingers
  3. "South West's tiltup kit for the Whisper 100 or 200 it is a 80 ft tower with 2 1/2 sched 40 pipe I noticed they have 5 guy wire sets" and I have seen three of their setups and none use turnbuckles ...I like 1/2x6 jaw+ eye
source for hardware posted before:
http://www.baronsnaps.com/products_items.aspx?Category=Turnbuckles&Subcategory=Jaw+%26+Eye&P age=1

check out malleable wire rope clips and HD thimbles too ...if someone has a better deal, then let me know about it

Stew Corman from sunny Endicott

[ Parent ]



Re: Tower guy wires (3.00 / 0) (#8)
by frackers (g8ecj at *nospam* gilks dot org) on Wed Aug 6th, 2008 at 08:25:30 PM MST
(User Info) http://www.gilks.org

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)
[ Parent ]



Tower guy wires | 8 comments (8 topical, 0 editorial)

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