[TowerTalk] 25G vs 45G

[Michael Tope]

#4 - Its a helluva lot easier to get a rotator into
a section of 45G than it is 25G.

Also, expanding quantitative on #1 - the maximum
allowable overturning moment for 45G is 1.7 times
that of 25G (11,400 ft*lbs vs 6720 ft*lbs).

Mike, W4EF.........................................


----- Original Message -----
From: "John Langdon" <jlangdon@outer.net>
To: "J.P." <w2xx@cloud9.net>; <towertalk@contesting.com>
Sent: Tuesday, July 11, 2000 5:49 PM
Subject: RE: [TowerTalk] 25G vs 45G


>
> Some additional factors:
>
> 1. 45G is stiffer than 25G and moves less.
> 2. 45G is much easier on the feet and much more comfortable to climb
> 3. 45G resale is extremely good, very easy to sell for large % of
> acquisition cost
>
> 73 John N5CQ
>
>
> -----Original Message-----
> From: owner-towertalk@contesting.com
> [mailto:owner-towertalk@contesting.com]On Behalf Of J.P.
> Sent: Tuesday, July 11, 2000 7:39 PM
> To: towertalk@contesting.com
> Subject: Re: [TowerTalk] 25G vs 45G
>
>
> Greetings:
>
> > I am getting ready to put up my first "real" tower. I am trying to
decide
> > between Rohn 25G and 45G. On the Rohn website, the windload specs for 25
> and
> > 45 are virtually the same at 80 feet. Is this true? How can this be
> correct?
>
> If you look closer at the Rohn book, the 45G spec shows an additional 8 SQ
> feet
> already factored into the allowable load rating for antenna standoff's at
> the
> top.  Presumably, these would be for a commercial tower, where you would
> have several (Rohn specs 3) of these at the top to mount VHF/UHF sticks
> or what have you.
>
> In the ham calculation, you can add these 8 SQ feet to the allowable wind
> load,
> and then you see that 45G is much stronger than 25G at any wind speed.
>
> 73, J.P. W2XX
>
>
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