At 10:50 AM 8/11/2007, Donald Chester wrote:
>I recall reading an article in a pre-WWII radio publication about raising a
>100-ft tower entirely with a gin pole, requiring no climbing or crane. The
>tower was fully assembled on the ground, and the guy wire lengths were
>precisely calculated using a transit level, and cut to length. Two sets
>of permanent guys were connected to their anchors, while the third set was
>left unattached. A temporary set of guys was attached to the tower and to
>the top of a rigid pole, which was then hoisted to a vertical position. A
>couple more temporary guys were attached to the top of tower, anchored 180
>degrees apart.
This sounds like a variant of the falling derrick technique described
on this list a few times by Rick, N6RK (I think he has pictures and
diagrams on his website, too). A key question would be how long is
that secondary pole? 20-30 ft?
<snip>
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