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
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