On 6/13/17 11:23 PM, Kurt Andress wrote:
I am going to make an attempt to present some information and history
that might make this conundrum more understandable for those that follow
Don't shoot the messenger, I'm rooting for everyone that has a stake in
these matters! If I didn't, I would not have said a word!
So, in summary, sort of:
Tower mfrs cite a "X square feet" as opposed to a "X lbs load"
The X could be either the actual projected area (length x diameter) or
some "effective area" (a number that you could plug into F = rho*V^2*A)
Antenna manufacturers gave either actual projected area, or some
"effective area" as well.
So nobody really knows whether the tower or antenna is calculating for
the coefficient of drag.
And, of course, the Cd approximations in 222C are wrong (not only are
the actual numbers off, but they don't allow for change in Cd with
respect to Reynolds number regimes)
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