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## Re: [TowerTalk] {SPAM} Re: hazer comments

 To: "Roger (K8RI)" Re: [TowerTalk] {SPAM} Re: hazer comments "bill rubin" Thu, 31 Jul 2008 16:21:20 -0500 mailto:towertalk@contesting.com>
 ```sorry not 10% (#440) !! example 1/4 at 60F is #670 tension Guy Guy Cable Initial Tension (lb) Cable Ambient Temperature Diameter 0° F 20° F 40° F 60° F 80° F 100° F 120° F 3/16 590 520 460 400 340 280 220 1/4 980 870 770 670 560 460 360 5/16 1650 1470 1300 1120 950 780 610 73 Bill N1HWC On Wed, Jul 30, 2008 at 11:17 PM, Roger (K8RI) wrote: > Dan Hearn wrote: > > Dennis: You will find different opinions here on many subjects however I > > believe there is almost uniform opinion on guying crankup towers. Don't > do > > it. That puts additional stress on the lifting cables when horizontal > force > > is applied to the tower. 73. Dan, N5AR > > > > > (If I did the math correctly) > Think of it this way. Each 1/4" guy wire at 440# tension (10% of 4400# > strength) and 60 degrees at the anchor = 30 degrees angle at the > tower. Neglecting the weight of the guy = 440*Cos(30) = 381#. There are > three guys per level so that would be 1143# vertical load added to the > tower and on the raising cables. > Say a second set at 45 degrees = 440#*Cos(45)= 311# or 933# vertical > load added, so adding just two sets of 1/4" guys properly tensioned will > add 2076# vertical load to the tower and cables. IOW adding guys to just > two levels that move adds over a ton of load on the cables. Using steel > guys would also add additional weight from the cables as would larger, > stronger guys. > > The strength of wire rope varies over a very wide range which makes the > selection of the cables a primary consideration and pretty much > eliminates what you find at the corner hardware, or big box store > although the hardware store could likely order it to spec. This is also > why it's important not to oversize the guys on a tower. > > 73 > > Roger (K8RI - ARRL Life Member) > www.rogerhalstead.com > N833R (World's oldest Debonair) > > _______________________________________________ > > > > _______________________________________________ > TowerTalk mailing list > TowerTalk@contesting.com > http://lists.contesting.com/mailman/listinfo/towertalk > _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk ```
 Current Thread [TowerTalk] hazer comments, Gregg Seidl Re: [TowerTalk] hazer comments, David Thompson Re: [TowerTalk] hazer comments, WB4UNA Re: [TowerTalk] hazer comments, Dennis Petrich Re: [TowerTalk] {SPAM} Re: hazer comments, Dan Hearn Re: [TowerTalk] {SPAM} Re: hazer comments, WA3GIN Re: [TowerTalk] {SPAM} Re: hazer comments, Roger (K8RI) Re: [TowerTalk] {SPAM} Re: hazer comments, bill rubin <= Re: [TowerTalk] {SPAM} Re: hazer comments, Roger (K8RI) Re: [TowerTalk] {SPAM} Re: hazer comments, bill rubin Re: [TowerTalk] {SPAM} Re: hazer comments, Roger (K8RI)