On 8/19/2013 9:58 PM, GARY HUBER wrote:
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
2" DOM is far stronger and resistant to bending than schedule 40 pipe.
DOM Characteristics: http://www.speedymetals.com/information/material17.html
I use 24' sections with end caps of 1/4" steel welded in place and
machined flat. I use an 18" section of 2 1/2" as a splice with 6 SS cap
screws on each end.
73
Roger (K8RI)
c
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@msn.com
309-662-0604
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