Suggest you contact an engineer. Wood is a far different material than
whatever you are using. Variables include: diameter of the pipe, thickness
of the wall, whether the interior is filled with concrete and rebar.
Anything you might come up on your own is an educated guess at best . I'm not
a
big fan of guessing on a 100 ft tower.
Some guys use a steel girder as the post.
Bill K4XS/KH7XS
In a message dated 7/16/2015 7:24:58 P.M. Coordinated Universal Time,
ak4qa@msn.com writes:
Does anyone have a the formula for guy posts?
I have a friend that wants tall guy posts (7 feet) for a 100 foot tower so
he can walk under them. I need to show him the stress that is involved in
that as opposed to 2 feet out of the ground.
I've always used the wooden pole rule of thumb; for every foot up you need
3 feet down.
Also, if you have the calculation for the back guy (i.e. earth screws)
well my friends, that would be gravy on my biscuit!
All the best and
73,LeeAK4QA
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