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

To: bcarling@cfl.rr.com, towertalk@contesting.com
Subject: Re: [TowerTalk] [Bulk] 30 foot Rohn 25G calculations
From: Grant Saviers <grants2@pacbell.net>
Date: Thu, 12 Feb 2015 09:14:26 -0800
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
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@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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