[TowerTalk] 'falling derrick' tower erection

[Bob Nielsen]

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
> this.
> 
> Rick N6RK

Possibly a pantograph?  Sounds complicated with the stresses involved.

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Bob, N7XY