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## [TowerTalk] Elementary question - trig formula

 To: [TowerTalk] Elementary question - trig formula K9KJ@qsl.net (Thomas Johnson) Thu, 25 Jun 1998 16:36:14 -0500
 ```OK... Now, If I need MORE Phillystran to complete one last leg of my tower, and my tower is 50Ft, and I want to guy it at 45 feet, and my Ground anchor is 30 feet from the base of the tower, how much phillystran will I need to complete the connection (I will add on the Few extra feet later for clamping) Tom K9KJ Chuck Lewis wrote: > Yep. Similar triangles...it's just a simple proportion...no trig needed. > > B/(C+D) = ?/C or, > > ? = C x B/(C+D) > > Example: If you have a 100' tower (C+D), and the guys are out 60' (B), > > the distance out from the tower (?) at 50 feet DOWN (C) is > > 50' x 60'/100' = 30' > > Makes sense, huh? Just make sure you use the distance from the top down, > not the height of the (?). (Or redo the equation) > > Chuck, N4NM > > Pete Smith wrote: > > > > At the risk of getting into the dumb question territory: > > > > If you know how far from the base of your tower your guys attach (on flat > > ground), and you know how high they attach to the tower, then you should be > > able readily to calculate how much turning radius inside the guys would > > exist at any given height on the tower. Obviously, this would be useful > > for assessing a potential stack design. > > I > > /I > > / I > > / I C > > / I > > /----I > > / ? I > > / I D > > / I > > -----/----B---I--------- > > > > That is, if you know the lengths of B and C+D, then you ought to be able to > > figure out what "?" is for any length of C. > > > > Unfortunately, I've forgotten virtually all the plane geometry and trig > > formulas I ever learned, and I didn't keep any high school math books. I > > think the two triangles involved are called "similar triangles," but that's > > as far as my memory goes. Can anyone tell me offhand what the right > > formula is for this? Once I have the fomula I can do the calculations, but > > what to calculate? > > > > Thanks! > > > > 73, Pete Smith N4ZR > > In wild, wonderful, fairly rare WEST Virginia > > > > -- > > FAQ on WWW: http://www.contesting.com/towertalkfaq.html > > Submissions: towertalk@contesting.com > > Administrative requests: towertalk-REQUEST@contesting.com > > Problems: owner-towertalk@contesting.com > > Search: http://www.contesting.com/km9p/search.htm > > -- > FAQ on WWW: http://www.contesting.com/towertalkfaq.html > Submissions: towertalk@contesting.com > Administrative requests: towertalk-REQUEST@contesting.com > Problems: owner-towertalk@contesting.com > Search: http://www.contesting.com/km9p/search.htm -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions: towertalk@contesting.com Administrative requests: towertalk-REQUEST@contesting.com Problems: owner-towertalk@contesting.com Search: http://www.contesting.com/km9p/search.htm ```
 Current Thread [TowerTalk] Elementary question - trig formula, Pete Smith [TowerTalk] Elementary question - trig formula, Bill Aycock [TowerTalk] Elementary question - trig formula, WE9V Chad Kurszewski [TowerTalk] Elementary question - trig formula, Bill Hider [TowerTalk] Elementary question - trig formula, Chuck Lewis [TowerTalk] Elementary question - trig formula, Thomas Johnson <= [TowerTalk] Elementary question - trig formula, Chuck Lewis [TowerTalk] Elementary question - trig formula, Fred Hopengarten [TowerTalk] Elementary question - trig formula, T A RUSSELL [TowerTalk] Elementary question - trig formula, Bill Hider, N3RR [TowerTalk] Elementary question - trig formula, Al Samson