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## [TowerTalk] guy rod angle

 To: [TowerTalk] guy rod angle K7GCO@aol.com (K7GCO@aol.com) Fri, 7 Sep 2001 16:41:42 EDT
 ``` Let me tell you, my Static's professor (Is that old fossil still alive??) would be proud that I even remember as much of what he taught me as I've already told you. We're really digging into the dark ages now. IF you could assume that the base of your guyed tower was not fixed in position, but instead was allowed to slide frictionlessly in the horizontal plane, and assuming that the wind was 50 MPH at all points along the total height of the tower, then the increase in guy tension due to the wind would be basically equal in all three guys because the tower would deflect horizontally an equal distance along it's height. BUT, since the base of your tower IS fixed to one degree or another (set in concrete, single pin, etc), the horizontal deflection of the tower will be more at the top than it is at the bottom, so the increase in guy tension will be somewhat more in the upper set of guys than it is in the lower set. Being a tweek and not a structural engineer, my guess is that this difference in guy tension will still not be a very significant bearing on the overall problem. Actually, I'd gladly give you some real numbers on this, but I ran out of sufficient significant digits on my 5 inch Castell slide rule to complete the calculation. I really keep the slide rule and a 4X500 on my desk so young puke engineers can say "Wow! What are those?" Then I can proceed to impress them with my vast and limitless knowledge of the inane and arcane. 73, Brad, W5CGH In a message dated 9/7/01 11:25:54 AM Pacific Daylight Time, wbarby@telus.net writes:<< Hey Brad, if your 5 inch rule doesn't give you sufficient significant digits, I can loan you my 'circular' (about 10 inch diameter) slide rule that is equivalent to about 8 or 9 feet! heh heh! Wilf VE7QO >> Brad: All hams should have to take the course of Static's for tower applications. I still have and use my K&E Log Log Duplex Vector Slide Rule. It's great for computing dB's and Ballistic problems also. It's handy for ratios etc. Have you ever tried to add or subtract on a slide rule (trick question)? Wilf is right about the greater resolution of the circular slide rule. I even have a small slide rule as a tie clasp. The batteries never wear out like those in my 8 different engineering calculator--no polarity problems either! Here's a tip on battery life with those mercury jobs. When you think they are dead after a year or so, clean them with a pencil eraser and the contacts each time you think they are dead. I had a set in both my HP11C's last 8 years. There must be some Mercury outgassing doing some corroding to the contacts and "your nerves." Mercury poisoning mainly from Mercury fillings is the biggest cover up on earth at this time by the ADA. Other countries have banned mercury fillings and steps have started here--fortunately. There is the joke about the student class asked to multiple 2x2 on the slide rule. Lets see "2x2 equals 3.99999999999--call it 4." One year I got the school to give 2 weeks of a free math class before the regular classes and not one student dropped out that year due to all the usual excuses of work, money or other reasons. I got a raise also. The first year we used calculators in a class I taught we finished the normal work load 3 weeks earlier and did more review--they all got A's. It's the "simple math" students have more of a problem with than the technicalities of electronics, chemistry or physics. The calculator took care of most of the math problems. In a Metrics class I taught I pointed out that when you go to a gas station to get air for your tires, the terms are different in Metrics. Instead of saying "give me 30 lbs/sqin pressure give me 200,000 Newtons/Meter Squared." A student said "what's that in FigaNewtons? k7gco List Sponsored by AN Wireless: AN Wireless handles Rohn tower systems, Trylon Titan towers, coax, hardline and more. Also check out our self supporting towers up to 96 feet for under \$1500!! http://www.anwireless.com ----- FAQ on WWW: http://www.contesting.com/FAQ/towertalk Submissions: towertalk@contesting.com Administrative requests: towertalk-REQUEST@contesting.com Problems: owner-towertalk@contesting.com ```
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