Where and how you attach to the HDBX would be the starting point. A bit
tricky given its design. 2/3 the way up might be ok so it doesn't
buckle, but that is a guess. It's a trade off of tension buckling vs
bending buckling and how to distribute the connection load to the angle
members. Better ask Rohn.
Grant KZ1W
On 3/20/2021 07:50, John Simmons wrote:
I'm planning a tower installation for the summer. It is an HDBX,
sections 8-4 (40 feet) with the hinged base. A 70 pound yagi and a
Tailtwister will be at the top with a very short mast. I want to build a
falling derrick system for it.
I'm searching for answers to a couple questions:
* How long should the lever be?
* How much pulling force will I need to raise the tower? I realize
that the force will be maximum when the tower just comes off the
ground.
I found this reference:
https://comtech.ru/en/production/towers/tower-accessories/ct-s3ts/ct-s3ts-falling-derrick-tilt-up-method/
I'm neither good at physics nor math above algebra.
Comments?
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