[TowerTalk] Rohn 25/Crankup loading

[Rex Lint]

Pat,

The cable goes up to a PULLEY, then down again to another.  The pulley is
taking half the load, so a percentage the load *IS* carried by the corners
of the tower.  The lift cable is *NOT* carrying the total load of the
elevated tower sections.

Rex
K1HI

-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com]On Behalf Of Pat Barthelow
Sent: Saturday, January 29, 2005 1:14 PM
To: kr7x at comcast.net; mringel at bluecrab.org; towertalk at contesting.com
Subject: [TowerTalk] Rohn 25/Crankup loading

Folks:
I notice something different also, in how/where the load is carried on each
section of a crankup.  Assuming no blocks installed, and the lift cable
carrying the total load of the elevated tower sections,   the load is not
carried down the corners of the tower, at least not directly.   It is
applied at single  point sources in each tower section, namely the cable
pulley axle bolts, in my tower, located on the side of the tower trellis
work. The corner joints of the tower 'float'.  That is, there is no direct
downward transfer of stress though the three corner tubes of the tower.
Does this single point source of loading change any basic dynamics of load
transfer down the tower structure?

73, DX, de Pat Barthelow  AA6EG
(831) 646-0388    aa6eg at hotmail.com


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