[TowerTalk] 2 inch Mast versus schedule 80 pipe?

[Doug Scribner]

Gary,

I bought a 15 foot piece of 6061-T6 aluminum, .25" wall from here:

http://www.metalsupermarkets.com/MSC-Home.aspx

For me it was a 200 miles round trip. You have one about 2 hours away in 
Villa Park.

I paid $120...

73
Doug - K1ZO

----- Original Message ----- 
From: <john at kk9a.com>
To: <TowerTalk at contesting.com>
Cc: <glhuber at msn.com>
Sent: Tuesday, August 20, 2013 7:40 AM
Subject: Re: [TowerTalk] 2 inch Mast versus schedule 80 pipe?


> 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
>
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