Re[2]: [TowerTalk] The last aluminum mast comment

[donald.s.tucker@exgate.tek.com]

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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