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Re: [TowerTalk] Quick wind question

To: Martin Sole <>
Subject: Re: [TowerTalk] Quick wind question
From: Jim Lux <>
Date: Sun, 18 Mar 2007 06:52:34 -0700
List-post: <>
At 06:47 AM 3/18/2007, Martin Sole wrote:
>Thanks, nice and simple eh? :-)
>Reasonable = +/- 20% then a tad (metric or imperial tad, not important)
>Of course the answers now breed more questions. JUsta check list to 
>see if I'm doing this right.
>rho= Air Density in kg/m^3
>Cd= coefficient no units but I have determined that for a roughly 
>rectangular shape 2 is 'reasonable'

Use 1 for a "flat plate"


(cross section perpendicular to wind)


m/sec if you want to keep units consistent.

>Wind drag = ? (units) kg/m^2 ?


>Bending moment = force, units same as wind drag?

Force times distance - Newton Meters

>Add drag for pipe calculated at say half length, ok.
>Yield strength for the pipe is quoted as 250 Mega Pascals, multiply 
>by 145.04 to get in psi.

Need to scrounge up the equation for bending of pipe.   I'm looking 
for my little handbook, so I don't get it wrong.

>Many Thanks
>Martin, HS0ZED


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