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## [TowerTalk] Mast section modulus correction

 To: [TowerTalk] Mast section modulus correction psoper@donedeal.encore.com (Pete Soper) Thu, 01 May 1997 09:52:54 -0400
 ```(Toss that last "cookbook" message I sent into the bit bucket. Stan Griffiths was kind enough to point out that I botched the formula description. Here is what I should have written) For the folks that enjoy knowing how to do this stuff yourselves: Section modulus(of a hollow cylinder) = pi*(D**4 - d**4)/32D Where D is the outer diameter and d is D minus two times the wall thickness, "*" means multiply and "**" means raise to the power of (and pi is 3.1415). If you divide the section modulus into the inch-pounds of force on the mast you get the bending stress which must be less than the yield strength of the material to avoid damage. (From pages 3-4 to 3-6 of the Leeson book) Regards, Pete KS4XG -- 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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