Better check out Tri-Ex's specs.......... They use 70mph.
On Sat, 31 May 1997 17:18:13 -0700 (PDT) firstname.lastname@example.org (Stan Griffiths)
>>> Since you asked, most times obtaining a building permit entails
>>>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
>>>codes are generally in the same ballpark. Also, the crank-up
>>>only PE stamped in their state of manufacture; you need a local PE
>>>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
>>matter what kind of tower you are putting up. It would be out here.
>The thing that is different about crankups is that they are the ONLY
>tower I have ever seen advertised or speced for windspeeds of only 50
>I think the reason is obvious: If you really speced them for the
>will actually experience, they are too weak to hold up much of an
>with any safety factor at all. If the manufacturers speced them
>conservatively, they wouldn't sell any of them.
>FAQ on WWW: http://www.contesting.com/towertalkfaq.html
>Administrative requests: towertalk-REQUEST@contesting.com
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