At 5:03 PM -0800 3/8/98, Scott Ginsburg wrote:
>I'm interested in hearing from anyone out there who has had a Rohn 45G
>or 55G bracketed tower design done for them by a PE or Mechanical
>Engineer. In particular, I'd like to know how high above a single
>house bracket I can go without extra support, given an antenna of 8
>sq. ft. windload. If I'm reading the Rohn catalog right, it looks like
>55G can handle 10 sq ft at about 30' above the bracket, 80 MPH no ice.
>
>I read the article in Aug. 96 QST by K1KP and N1CQ that describes an
>interior support system for the bracket. Unfortunately I don't have an
>attic so this isn't an option. Am I out of luck without the ability to
>provide interior support? Is it impossible even with 45G or 55G to
>have 20 or 30' of tower above a single bracket which is just secured
>to house studs?
If the house isn't strong enough to secure the tower, you could easily find
your house being damaged as the tower pushes and pulls those studs.
>Before seriously pursuing a bracketed design I would definitely hire a
>PE. I'm just looking for a sanity check on whether or not what I'm
>inquiring about is feasible.
I don't believe Rohn publicly specs =any= bracketed tower with only one
bracket.
If I didn't want any guys at all and I couldn't use two very strong house
brackets, I would think about getting 60' of Rohn 65. That will support
9.4 sq ft at 80 mph self-supporting.
Good luck.
73, Dick
--
Dick Flanagan W6OLD CFII Minden, Nevada DM09db (South of Reno)
Visit http://www.qsl.net/w7di/
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