[TowerTalk] masts.

[jeremy-ca]

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 at aol.com>
To: <towertalk at contesting.com>; <Eroddy4366 at 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 at 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
>
>
>
>
>
>
>
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