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On Mar 21, 10:33�am, Michael Coslo wrote:
wrote:
On Mar 19, 2:00?pm, "KC4UAI" wrote:
On Mar 17, 9:43 am, wrote:


[snip]

One of the most fortunate bits of luck I had was that although I was
about 5 years away from becoming a Ham when we bought it, the
Neighborhood isn't antenna restricted, with the exception that if you
put up a tower, it has to be far away enough from the neighbors that it
won't fall on their house - seems reasonable to me! ;^)

Depends on the size of the lot. On a lot that's , say, 100
feet wide, you can't put up a tower more than 50 feet high
and have its "fall circle" not go over the property line.


Yet is that actually the correct way to calculate it? That assumes that the
tower will break at the base and fall over from the base. This is not the
common failure mode (or so I've been told). From one of the experts who was
speaking to a city council meeting around here, the towers either twist like
a corkscrew or bend over somewhere between the middle and top. The
"corkscrew" is supposedly the most common failure mode as that is the way
the towers are designed to react if wind loads are exceeded. However in
neither case is there a "fall circle".

Does anyone have information on this? Although the speaker was supposed to
be an expert, I'd be interested in some independent information on this.

Dee, N8UZE