[TowerTalk] [Bulk] 30 foot Rohn 25G calculations

[Grant Saviers]

139 mph with no guys????  No way.   Rohn catalog rates 30' of R25 
unguyed at 90mph 1.7 sq ft.  55g maybe a small tribander.  You need a PE.

Grant KZ1W


On 2/12/2015 6:58 AM, bcarling at cfl.rr.com wrote:
> (I'm not sure if my earler message came  through, not seeing it....)
>
> I am putting together a permit application with my city which requires certfication for 139 mph
> for three second gusts as in TI-222 spec. Also steady 100 or 110 mph I think. I will review
> that.
>
> We are making a 30 foot Rohn 25G tower according to the Rohn specification with  4 foot
> cube base of concrete with no guys. I'm just qualifying the tower for the permit.
> I already have good drawings and aof course borrowed the Rohn PDF blurb that says it is
> compliant with TI-222.
>
> Does anyone know of a set of calculations for this fairly standard tower? We would love to
> find someone who would share their calculations or point us to someone who would
> do them reasonably?
>
> I know someone mentioned some possibilities earlier, via ARRL or whatever...
>
> Any pointers will be appreciated.
>
> Bry, AF4K
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