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## [TowerTalk] Elementary question - trig formula

 To: [TowerTalk] Elementary question - trig formula clewis@ro.com (Chuck Lewis) Thu, 25 Jun 1998 16:14:43 -0500
 ```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 ```
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