[OKDXA] masts

[AE5MH]

I just went to the local drillpipe supply near 50th and I-35.  It was
several years ago and it was about 65 bucks for a 21 ft stick.  1/4 in think
wall carbon steel that had been enamel coated.  When my tower fell in
December (tree came down on two guy anchors) 8 ft was in the tower and 13 ft
was above it.  The tower bent at the 6 ft (above ground) mark.  The pipe
bent about 30 degrees at the throat of the top section.  The amazing thing
is that all but one section was salvageable!  I attribute this to the mast
taking most of the brunt of the impact with the ground.  A mast of this
caliber is practically a two man lift so I can advise you that a heavy duty
thrust bearing is very important in an installation such as this.  This is
especially true when the tower is only Rohn 25.

The only hard part of using a mast like this was putting it in after the
tower was up!
I used a 17 ft mast in the Gin Pole to stab it in the already erect tower.

Mark
AE5MH

-----Original Message-----
From: okdxa-bounces at mailman.qth.net [mailto:okdxa-bounces at mailman.qth.net]
On Behalf Of N5PA
Sent: Thursday, April 24, 2008 10:53 PM
To: 'Discussion of OKDXA'
Subject: RE: [OKDXA] masts

Doug:

I used the 2" OD High Carbon Steel Mast with quarter inch walls.  It
withstood Hurricane Katrina and 125 MPH+ winds without a single bend.  I
drilled a hole in it and put a bolt through it and the Tailtwister.  It was
expensive but I got it from Texas Towers.

73,
Alan, N5PA


-----Original Message-----
From: W5GA [mailto:w5ga at arrl.net] 
Sent: Thursday, April 24, 2008 10:10 PM
To: 'Discussion of OKDXA'
Subject: [OKDXA] masts

Quick survey here.what type of mast are you using to mount your ants on.
DOM?  Chromoly?  Diameter and wall thickness?

73, Doug W5GA


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