[450] up and coming antenna project

[George Andrews]

Charlie,

I am not a mechanical engineer. I don't know how much mast you will have 
above the first bracket or what the toatal wind load will be, but most of 
the wind load will be beating on the first bracket and the chimney. Chimney 
structures are not intended to have flex. You can calculate the load on the 
first bracket by using the weight of antennae and the length of mast above 
the first bracket and consider the mast a lever arm. You will probably end 
up with a number and the units are probably foot pounds. But once you get 
that number, I don't know how to determine impact on your mount. That's 
where the engineering part comes in. You can probably think of it as a 
torque. To make it mean something, compare it to engine torque. That will 
give you some idea of what the foot pound mean. If you need the equation, 
look it up or I will get it for you. Let me know if you need the equation. 
It's been forty years or so since I have done that kind of calculation.

In any case, GL. Anything more than a tv antenna and a short mask is an 
undefined risk.

George
N1YAE
----- Original Message ----- 
From: "charlie woodside" <n1muq at optonline.net>
To: "144.450 Mailing List" <450 at lists.vhfwiki.com>
Sent: Monday, November 22, 2010 5:50 PM
Subject: [450] up and coming antenna project


> This is a crude drawing to give you na idea of how I plan to mount my
> antenna mast to my chimney.. Comments are welcome. Charlie N1MUQ
>


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