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PRB-1 and CC&R's
"Dee Flint" wrote ...
wrote ... 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. The structure hight as a radius is the "worst-case" limit of damage. Insurance underwriters, country commissioners, et.al. likely don't want to expose themselves to the liability of setting a more risky limit. Our anecdotal history of typical tower failures may not seem as compelling to people with actuarial risk at stake. |