[Towertalk] Rohn 25G rating

[k0rc]

Ford,

I would get a written quote for replacement Rohn 25G from a dealer,
including tax, license, and freight.  :-)   Then a written quote to have
someone install it for you.  This is equivalent replacement without having
to deal with any engineering issues.  Present these quotes to the insurance
company, receive their check, and then buy what you want.

If your question is more along the lines of comparing what you had to what
you want, I wouldn't get the insurance company involved in this process.  It
could raise a flage whether the original tower was "under-engineered" in the
first place.

The 20 and 30 PSF is the amount of wind pressure asserted on a square foot
of flat surface at different wind speeds.  The more technical guys will have
to verify the MPH that relates to 20 & 30 PSF as I am not 100% positive [70
mph & 80 mph is my cup-of-coffee guess].

73 de Bob - K0RC


----- Original Message -----
From: "Ford Peterson" <ford@cmgate.com>
To: <Towertalk@contesting.com>
Sent: Wednesday, May 22, 2002 12:53 AM
Subject: [Towertalk] Rohn 25G rating


> I lost a Rohn 25G (68') tiltover tower a few weeks ago to a monster storm
> that came through unexpectedly.  I need to understand the rating of the
old
> tower for insurance purposes--I need to "replace" the tower.  Most
> advertising for antennas talk about Sq Ft at MPH ratings, typically 50,
70,
> 90, 100MPH, etc.  The Rohn catalog talks about "20 PSF" and "30 PSF."
>
> My drawings that came with the tower talk about the following ratings:
>
> @ 20 PSF 11.7 Sq Ft
> @ 30 PSF 6.2 Sq Ft
>
> There is no reference to MPH anywhere.  How do I convert the notion of PSF
> to MPH and visa-versa?
>
> I'm trying to find a comparable tower to replace what I had, again, for
> insurance purposes.  The key features that need to be replaced involved
> being able to work on my own antenna, on the ground.  That really limits
my
> options to crank-up, tip-over towers.  Until I can reconcile the two
> separate specification disclosures, picking a suitable "replacement" tower
> is difficult since all current offerings by other manufacturers rate
> everything in "MPH."
>
> If any of the tower gurus haunting this list can help, I'm all ears...
>
> Ford-NØFP
> ford@cmgate.com
>
>
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