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## [TowerTalk] Elementary question - trig formula

 To: [TowerTalk] Elementary question - trig formula baycock@hiwaay.net (Bill Aycock) Thu, 25 Jun 1998 14:19:15 -0500
 ```At 03:12 PM 6/25/98 -0400, you wrote: > Pete- it doesn't take trig- it's a matter of simple proportions B/(C+D)=?/C-- simpler- the ratio of the base spread to the total height is the same as the ratio of the spread at any height to the distance down from the top. Bill > >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 > Bill Aycock --- Persimmon Hill Woodville, Alabama, US 35776 (in the N.E. corner of the State) W4BSG -- Grid EM64vr baycock@HiWAAY.net -- 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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