I use 21' of 1020DOM 1/4" wall steel tube for 2 towers. However on another
I have a 15' length of galvanized fence pipe. I believe it is called
Schedule 40+ and it has supported a 3 el 20M monobander, a 38' boom 8 el 6M
yagi at the top and a 28' boom 432 yagi in the middle. It is not cast iron
and is both strong and light and cheap when I bought it 15 years ago. Never
a problem here on this exposed hilltop rock pile.
At a former QTH with less wind exposure I had a 20/15/10 stack of W2PV 4el
monobanders on 20' of 2 3/8 OD galvanized cast pipe. Except for eating
rotators (Daiwa and Create even using 2 thrust bearings) it survived just
fine thru many northeasters, CAT 2 & 3 hurricanes and ice storms while on
100' of 25G.
Im sure that there are many parts of the country that cast pipe would fail
but dont discount it altogether.
Carl
KM1H
----- Original Message -----
From: <K7LXC@aol.com>
To: <towertalk@contesting.com>; <Eroddy4366@aol.com>
Sent: Friday, June 01, 2007 9:46 AM
Subject: Re: [TowerTalk] masts.
>
> In a message dated 5/31/2007 7:56:02 P.M. Pacific Daylight Time,
> towertalk-request@contesting.com writes:
>
>> i need to install a new mast to support a t12 log antenna.i want to use
> 10ft
> of sch40 galvy pipe 2 inch in dia.anyone think differently.i had thought
> about using sch 10 sprinkler pipe.thankyou
>
> Ouch - a recipe for disaster. Pipe - the definition of which has been
> recently discussed - is not rated for strength and is heavy but not
> strong
> enough. A typical water pipe might have 35,000 psi yield strength. You're
> probably going to need more than that; e.g. 50-60,000 or more.
>
> You didn't mention your local windspeed rating. If you don't know, you
> can find it on _www.championradio.com_ (http://www.championradio.com)
> under
> "Tech Notes".
>
> I sell the MARC Program - the Mast, Antenna and Rotator Calculator -
> for
> ten bucks on the same website. It'll give you the info you need. And you
> need tubing - not pipe.
>
> Cheers,
> Steve K7LXC
> TOWER TECH and
> Champion Radio Products
> Cell: 206-890-4188
>
>
>
>
>
>
>
> ************************************** See what's free at
> http://www.aol.com.
> _______________________________________________
>
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