7.5 feet is the recommended depth for the LM-470 base. I kept that as the
constant
and varied the diameter to get to the same volume.But then I am not a PE.
I remember when the Commonwealth of Massachusetts gave those Certs to anyone
with a BS degree. Should have picked up one back then.
73, Dick, W1KSZ
> Date: Mon, 12 May 2008 16:33:56 -0700> From: jimlux@earthlink.net> To:
> w1ksz@q.com> CC: towertalk@contesting.com> Subject: Re: [TowerTalk] Digging a
> 5'x5'x8' tower footing> > RICHARD SOLOMON wrote:> > If my math is correct
> (only took off the left shoe), the LM-470 requires > > a base> > 3.5' X 3.5'
> X 7.5'. that equals a 4' diameter by 7.5' deep hole.> > Now I need to talk to
> the Tower folks and see if they would sign off on > > that.> > > > > If
> volume is the relevant thing, yes.> > As a practical matter, the holes I've
> seen drilled have always been much > deeper than in diameter. In your
> example, perhaps 3 ft in diameter by > 13 feet deep, or 2.5 ft by 19-20 ft.>
> > An interesting question.. what if you were just to drill/dig a 2 foot >
> diameter hole and bury some length of tower segments, in either dirt or >
> concrete? If you do it like telephone poles, they bury 15-20% of the >
> overall length and they do it in plain old dirt.
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