Hi Gene and Mike, my recollection is there were no 90 mph calculations for
the BX series towers.
The conversion from 70 to 90 mph is not simple or straightforward. The
problem is that the tower itself represents a large windload and when that is
taken into account, there is nothing left for an antenna load.
Sorry to be the bearer of bad news!
73,
Gerald K5GW
In a message dated 12/6/2011 3:43:51 P.M. Central Standard Time,
w2lu@rochester.rr.com writes:
As I recall wind pressure "on a flat surface" at 70 mph is 20.6 lbs/sq
ft.,
so if the tower is rated for
18 sq ft at 70 mph, would it be too much of a stretch to say to the zoning
board that since wind pressure at 90 mph is 34 lbs/sq ft, by simple math,
the tower should be good for 10.9 sq ft at 90 mph ?
Gene / W2LU
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