[TowerTalk] 2 inch Mast versus schedule 80 pipe?

[john at kk9a.com]

You should use a mast calculator to determine your requirements.  If the
antenna is not high above the tower a galvanized pipe may be adequate.
Unfortunately the yield strength is probably a guess and the OD is not a
standard mast size. I have had excellent success with 6061 aluminum masts
and they are readily available. A step up is 1026 DOM tube, but then you
would need some type of corrosion protection.

GL,
John KK9A



To:	 "TT TowerTalk" <TowerTalk at contesting.com>
Subject: [TowerTalk] 2 inch Mast versus schedule 80 pipe?
From:	 GARY HUBER <glhuber at msn.com>
Date:	 Mon, 19 Aug 2013 20:58:59 -0500


Environment:  50 foot AGL Rohn 45G flat top bracketed @ 23 feet, T2X
TailTwister  on  Rohn rotor shelf,  Rohn 2 inch bearing, Hy-Gain TH-7 1 – 2
feet above bearing, with boom support (3 feet above boom).

I’ve had a ten foot section of 2 inch schedule 40 galvanized pipe in  a
similar
(tapered top – exception) environment for close to thirty years. I’m now
getting ready to replace the existing tower with new, cables, rotor, antenna,
etc.  Maximum intended life of the new installation: No more than 15 years

Thus far I have not found a source with specifications of 2 inch mast tube
and
have been looking at galvanized pipe again, either schedule 40 or schedule
80.
I took a S.W.A.G. the last time and was fresh from working at a steam power
plant where we worked with pipes daily. That knowledge is gone; anyone
have any
suggestions or recommendations for a rotor mast carrying 75 pounds, 12 sq
feet,
and 240 pound wind load at 80 MPH? tube or pipe, sched 40 or sched 80,
where to
buy?

Best regards,

CSM(r) Gary L Huber – AB9M
9679 Heron Bay Road
Bloomington, IL 61705

WWW.CSM-GH.COM
glhuber at msn.com
309-662-0604