There are several grades of fence posts; the cheap stuff is Schedule 15 and
other choices go up to 83,000 psi yield strength.
The 2" (1.9" OD) 40+ that I use has a yield of 50,000 psi and a bending
moment of 14050 lb". Going up to the 2 3/8" OD bumps the bending moment to
24405 lb". Pretty healthy specs IMO and a good choice when DOM or chrome
moly isnt required. And since it is produced in huge quantities the cost is
Schedule 15 of similar 1.9" OD has a bending moment of 9100 lb". The next
size smaller is only 6830 lb".
Id warrant a guess that hardware/box store import fencing is far less.
I found the specs on the following URL, it covers a wide range of pipe and
----- Original Message -----
From: "Julio Peralta" <firstname.lastname@example.org>
To: "'jeremy-ca'" <email@example.com>; <K7LXC@aol.com>;
Sent: Friday, June 01, 2007 1:43 PM
Subject: RE: [TowerTalk] masts.
> Many years ago I stacked two 6elem 6M beams on that fence rail material.
> A small storm bent the mast just above the 1st antenna and we had a hell
> of a time getting it down. I would not recommend fence material for
> stacking antennas.
> Julio, W4HY
> -----Original Message-----
> From: firstname.lastname@example.org
> [mailto:email@example.com] On Behalf Of jeremy-ca
> Sent: Friday, June 01, 2007 12:13 PM
> To: K7LXC@aol.com; firstname.lastname@example.org; Eroddy4366@aol.com
> Subject: Re: [TowerTalk] masts.
> I use 21' of 1020DOM 1/4" wall steel tube for 2 towers. However on
> 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
> yagi at the top and a 28' boom 432 yagi in the middle. It is not cast
> and is both strong and light and cheap when I bought it 15 years ago.
> 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
> 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
> fine thru many northeasters, CAT 2 & 3 hurricanes and ice storms while
> 100' of 25G.
> Im sure that there are many parts of the country that cast pipe would
> but dont discount it altogether.
> ----- Original Message -----
> From: <K7LXC@aol.com>
> To: <email@example.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,
>> firstname.lastname@example.org writes:
>>> i need to install a new mast to support a t12 log antenna.i want to
>> of sch40 galvy pipe 2 inch in dia.anyone think differently.i had
>> about using sch 10 sprinkler pipe.thankyou
>> Ouch - a recipe for disaster. Pipe - the definition of which has
>> recently discussed - is not rated for strength and is heavy but not
>> enough. A typical water pipe might have 35,000 psi yield strength.
>> 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,
>> can find it on _www.championradio.com_ (http://www.championradio.com)
>> "Tech Notes".
>> I sell the MARC Program - the Mast, Antenna and Rotator Calculator
>> ten bucks on the same website. It'll give you the info you need. And
>> need tubing - not pipe.
>> Steve K7LXC
>> TOWER TECH and
>> Champion Radio Products
>> Cell: 206-890-4188
>> ************************************** See what's free at
>> TowerTalk mailing list
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