[TowerTalk] Mast strengths

[Dick Weber]

Hi Steve,

	It is the ratio of the section modii of each mast. The 3"OD x .25 wall is 2.54 times stronger than a 2"OD x .25 wall tube of the same material. 154% more.

73,

Dick, K5IU 
--------------------------------------------------------------------------------------------------------------------
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From: 	K7LXC@aol.com[SMTP:K7LXC@aol.com]
Sent: 	Wednesday, April 30, 1997 1:21 PM
To: 	towertalk@contesting.com
Subject: 	[TowerTalk] Mast strengths

TowerTalkians --

     My question for y'all (I'm from South Snohomish County) has to do with
the relative yield strength of a 3 inch mast versus a 2 inch mast.  Let's
assume that they are the same material (4130 - 75,000 psi yield) and the same
wall thickness (0.250").  How much more load will the 3 inch take over the 2
inch at the same windspeed?  I'm not looking for a paper on this, I just want
an idea of the relative approximate difference.  Is it 20% more, 30% or what?

       Thanks!

73,  Steve  K7LXC

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