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## 4130 masts

 To: 4130 masts bob@the-professor.carson-city.nv.us (robert j. walsh) Wed, 08 Jan 1997 22:09:25 -0800
 Has anyone had a failure with 2" x .25" 4130 chrome moly. If so, what did you have on your mast and what were the weather condz at the time of failure. I would also like to hear from those who are using 2" x .25" or bigger who have not had failure. I would like to know what you have on your mast (sqft, boom length, how much out of the tower, etc). If there have been any failures, what will you use next time? Also, are there any opinions, pro and con, to using either a larger diameter and/or thicker wall? One would think that either one would increase the PSI rating. But I am finding that not to be true. In some cases the PSI decreases. Can anyone explain the the math on this? Or is it a function of the percentage of elements in the alloy? This would seem to be the logical explantion. I have found 2" x .25" 4130 with PSI ratings from 110,000 up to 168,000. A number of years ago Stan, W7NI, had an excellent article in NCJ on masts. Does anyone remember what year and/or issues? 73 Bob, K6OMB -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions: towertalk@contesting.com Administrative requests: towertalk-REQUEST@contesting.com Problems: K7LXC@contesting.com Sponsored by Akorn Access, Inc & KM9P
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