I have a 64' aluminum 14"/18" tower with a steel hinged base. I have
previously raised and lowered it several times with 16' ground mounted, back
guyed gin pole and HD block and tackle, pulled by my car. This was done
successfully by intuitive estimation of the loads, plus a large safety
margin factor.
However, I am in a different qth and installation scenario (now 75 years
young) . I would like to be able to raise the tower with beam/feedline
installed while on the ground with a tilt hinge mount, and then temporarily
anchored to my roof line (with appropriate inside bracing), for raising. I
can calculate the tower alone loads, but I'm not sure about the added load
of the beam at the end or top. Thus, I would like to more accurately
calculate the estimated loads on the tackle/hardware to the roof.
My question: Is there a formula(s) in which I can enter the linear tower
weight as well as well as the beam weight at the top, then the attachment
location, to estimate or determine what the rigging loads would be at the 13
' level of the tower and the 13' height at the roof line? This would assist
me in determining the needed attachments and bracing for the hardware to
the roof rafters. I am estimating it will be about 1200 lbs or so, but I
would like to be more sure.
I was not able to find anything online that I could decipher and apply.
Any assistance will be appreciated.
Ray, W4BYG
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