Better check out Tri-Ex's specs.......... They use 70mph.
Bill, KB3AUG
On Sat, 31 May 1997 17:18:13 -0700 (PDT) w7ni@teleport.com (Stan Griffiths)
writes:
>
>>> Since you asked, most times obtaining a building permit entails
>having
>>>stamped PE drawings in your document package.
>>
>>That's the way it is around here.
>>
>>> Crank-ups are mostly rated at 50 MPH
>>>where the minimum TIA-222 wind speed is 70 MPH. UBC and other
>building
>>>codes are generally in the same ballpark. Also, the crank-up
>drawings are
>>>only PE stamped in their state of manufacture; you need a local PE
>to stamp
>>>your local drawings.
>
> In our county it doesn't
>>matter, you still need the signed calcs no matter what kind of tower.
> Also I
>>would think that since PEs are licensed by the states, and many
>states do not
>>accept work from out-of-state PEs that this would be the same
>problem, no
>>matter what kind of tower you are putting up. It would be out here.
>Am I
>>missing something?
>
>The thing that is different about crankups is that they are the ONLY
>type of
>tower I have ever seen advertised or speced for windspeeds of only 50
>MPH.
>I think the reason is obvious: If you really speced them for the
>winds they
>will actually experience, they are too weak to hold up much of an
>antenna
>with any safety factor at all. If the manufacturers speced them
>conservatively, they wouldn't sell any of them.
>
>Stan w7ni@teleport.com
>
>
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