Towertalk
[Top] [All Lists]

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

 To: towertalk@contesting.com Re: [TowerTalk] Tower Base Round or Square? Mike Wed, 26 Oct 2011 21:35:04 -0400 mailto:towertalk@contesting.com>
 ```The above ground "cap" could still be square. 73, Mike NF4L On 10/26/2011 5:20 PM, vk3pa@vk3pa.com wrote: > JUST THINK ABOUT WHEN U NEED TO MOW THE LAWN AROUND THE TOWER!! > its easy to cut around a square form "but" a round one not so easy. my > 2 bob's worth DE VK3PA > > > Quoting "Joe Subich, W4TV": > >> 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 > _______________________________________________ _______________________________________________ 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?, Mike <= 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