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[TowerTalk] Fwd: Mast and stacking question

 To: [TowerTalk] Fwd: Mast and stacking question w7ni@teleport.com (Stan Griffiths) Sat, 3 May 1997 22:08:09 -0700 (PDT)
 ```>I do have a question or two. I have determined that with my three antennas I >will need a mast capable of 65000 PSI Y.S. It also recommends .250" wall >thickness. Will it matter what the wall thickness is as long as the Y.S. is >at least the desired value? Yes, it will. The actual amount of load the mast will take is a function of BOTH the yield strength of the material AND the cross-sectional dimesnions (OD and wall thickness) of the mast. The supplier I found claims that his 4130 .250" >wall is rated at 100,000 PSI or better and that I probably could go with >.188" >or .156" wall instead. Any thoughts? Your supplier is suggesting that you can trade off some wall thickness for a material of higher yield strength. He is correct. You will have to do some calculations to know if it a wise tradeoff or not. Where can I find data that will show >Y.S. based on wall thickness? You can't find that data since Y.S. in only a function of what alloy the mast is made of and not its dimensions. The total load a mast will take is a function of both Y.S. and the mast dimensions. Hope this helps. Stan w7ni@teleport.com PS You might ask Steve for a copy of my article that I wrote years ago telling how to make the calculations I referred to above. -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions: towertalk@contesting.com Administrative requests: towertalk-REQUEST@contesting.com Problems: owner-towertalk@contesting.com ```
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