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

[bcarling at cfl.rr.com]

This is why I wanted to go with a guyed Rohn 25G in the first place.

Someone tried to talk me out of it since I have such a small yard.

Heck, I only want to go up 30 feet. One set of guys should do it, right?


On 12 Feb 2015 at 9:14, Grant Saviers wrote:

> 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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