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[TowerTalk] Error correction: Re: Wind loading

To: "Michael Tope" <>, "Bill" <>,<>, <>
Subject: [TowerTalk] Error correction: Re: Wind loading
From: Jim Lux <>
Date: Sun, 26 Mar 2006 20:48:47 -0800
List-post: <>
At 08:19 PM 3/26/2006, Jim Lux wrote:
>At 06:17 PM 3/26/2006, Michael Tope wrote:
> >
>Cd varies as a function of Re, which in turn scales as Windspeed and
>diameter (that is, if the velocity doubles, the Re doubles...if the
>diameter doubles the Re is halved)

This is wrong.. Re is proportional to "length" * "velocity", so the latter 
half of the statement is incorrect..

If diameter doubles, Re doubles...

So, bigger tubes make for bigger Re, pushing you up to the Cd=0.18, which 
is what it convergest to for large Re  (6" tubes in 60 mi/hr winds, etc.)



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