[TowerTalk] Quick wind question

[Jim Lux]

At 06:47 AM 3/18/2007, Martin Sole wrote:
>Jim,
>
>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"

>Area=m^2

(cross section perpendicular to wind)

>wind=kph^2

m/sec if you want to keep units consistent.


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

Newtons


>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