[TowerTalk] 'falling derrick' tower erection
nielsen at oz.net
Mon Mar 29 10:09:24 EST 2004
On Mon, Mar 29, 2004 at 08:49:28AM -0800, Richard Karlquist wrote:
> > There is a published design to keep the beams horizontal during layover,
> > by the way.
> > N2EA
> > jimjarvis at ieee.org
> Anyone have a pointer to this published design?
> I've been trying to figure out clever ways to do
> Rick N6RK
Possibly a pantograph? Sounds complicated with the stresses involved.
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