OK, who is Tom?? Do we have a consensus albeit all agree that I am pushing
the envelope? Would the situation be reasonably allevated if I set the
tower to autolower at 50MPH?
Dispite the spirited differences of opinion I've learned a lot. Thanks
folks.
Don W7WLL
> -----Original Message-----
> From: Ed Jensen [SMTP:k5ed@dzn.com]
> Sent: Friday, October 09, 1998 8:58 AM
> To: towertalk
> Subject: Fw: Re[2]: [TowerTalk] The last aluminum mast comment
>
>
> Hi Hank,
>
> You wrote:
>
> > Steve:
> >
> > Your calculations are a little off. Please note the following:
> > Discl 10 2.7 25 675 8100
>
> These were my calculations Hank, not Steve's. And you're right (gack), I
> left out the wind pressure from the 40m dipole calc (mea culpa). Revised
> numbers are:
>
> Antenna area (sq ft) Hgt (ft) bending moment(ft#)
> TH7 9.4 .5 118
> WARC 2/2 3.1 5 390
> Disc1 2.7 10 675
> 214FM 1.7 12 516
> mast 1.2 6 (avg) 180
>
> Total 1879 (over allowable
> 1628)
>
> OK, so we would have to use closer spacing (I know, it's getting a little
> close
> but the point is that it can work (if I just do the math right)),
>
> Put the TH7 right at the top of the tower, the WARC 2/2 at 4 ft, the
> Disc1
> at 8 ft and the 214FM at 10ft with 10 ft of mast sticking out of the
> tower.
> Then the loads are 0, 310, 540, 425, 150 for total of 1425 ft#, within
> the allowable stress of the mast.
>
> BTW, the excellent article by Stan on Tom's home page clearly explains the
> techniques so the the methods are readily available to anyone.
>
> 73, Ed
>
> Ed Jensen, K5ED, El Paso, TX, k5ed@dzn.com
>
>
>
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