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## Re: [TowerTalk] Tower Base Round or Square?

 To: towertalk@contesting.com Re: [TowerTalk] Tower Base Round or Square? Pete Smith n4zr@contesting.com Wed, 26 Oct 2011 17:21:14 -0400 mailto:towertalk@contesting.com>
 Does this apply to a guyed tower? I can understand big overturning forces in a self-supporter, but most of the forces acting on a guyed tower base are vertical, aren't they? 73, Pete N4ZR The World Contest Station Database, updated daily at www.conteststations.com The Reverse Beacon Network at http://reversebeacon.net, blog at reversebeacon.blogspot.com, spots at telnet.reversebeacon.net, port 7000 AND now at arcluster.reversebeacon.net port 7000 On 10/26/2011 5:10 PM, Joe Subich, W4TV wrote: > I asked the same question of a well known Professional Engineer a > couple of years ago. His answer was quite simple and made a lot > of sense ... the round base can be used instead of a square one > if the diameter of the round base is the same as the *diagonal* > measurement of the square base. > > In your case, for a 2' 6" (30") square base the round equivalent > would be 42" diameter *not* 36" as you propose. The reason has to > due with projected surface area - the area that resists overturning > - not volume (or weight) of the concrete. > > 73, > > ... Joe, W4TV > > > On 10/26/2011 1:28 PM, Richard Thorne wrote: >> I'm finally getting some dirt work done in the next day or two at my new >> place which will include holes/concrete for my 45g tower. >> >> I plan on using a pier pin install, so does it matter if the base is >> square or round? The rohn book calls for a 2' 6" square hole 4' deep >> (I'm designing the tower based on 90mhp winds with a height of 120'). >> It would be easier to use a 36" auger to dig the hole. Since I'm going >> with a pier pin I don't see that there would be any twisting moments on >> the concrete base, it would only be there to hold the tower up. But I'm >> not an engineer, hence the question. >> >> Thanks >> >> Rich - N5ZC >> >> >> _______________________________________________ >> >> >> >> _______________________________________________ >> 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 > > _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk
 Current Thread [TowerTalk] Tower Base Round or Square?, Richard Thorne Re: [TowerTalk] Tower Base Round or Square?, W0MU Mike Fatchett Re: [TowerTalk] Tower Base Round or Square?, K8RI on TT Re: [TowerTalk] Tower Base Round or Square?, Joe Subich, W4TV Re: [TowerTalk] Tower Base Round or Square?, vk3pa Re: [TowerTalk] Tower Base Round or Square?, Pete Smith <= Re: [TowerTalk] Tower Base Round or Square?, Joe Subich, W4TV Re: [TowerTalk] Tower Base Round or Square?, Pete Smith Re: [TowerTalk] Tower Base Round or Square?, Joe Subich, W4TV Re: [TowerTalk] Tower Base Round or Square?, Mike Re: [TowerTalk] Tower Base Round or Square?, Larry