[TowerTalk] Tilting tower query

[k0myw at att.net]

If you're serious about trying this method and looking for knowledgeable help, try tapping into your local sailing community. This is the technique that is commonly employed to step a mast  (install a mast upright on a sailboat). You might even find some sailors who, in addition to being willing to lend helping hands, also might have the blocks and other hardware necessary to safely accomplish the task. Just remember to not say "rope" to them; the correct term is "line" in sailorspeak...

73,
Mike, K0MYW



-------------- Original message ----------------------
From: "Rick Karlquist" <richard at karlquist.com>
>
> There are a lot of windmill monopoles for sale on the web
> that use this method of tilt up.  Suggest you read about
> them.  I've used this technique many times.  The "rigging"
> matters a lot.  The other pitfall is that the "stub mast" (also
> known as a "falling derrick") can buckle.  This buckling is
> encouraged if it sags from its own weight.  The fix for this
> is to put a mid span guy on it connected to the tower.
> 
> One fortunate aspect of buckling is that if the falling
> derrick is going to buckle, it will do so as soon as you
> try to lift off the tower.  Always lift the tower a foot
> or so and check for buckling.
> 
> If you have a big yard, like I do, where you have room to
> lay down a tower, I highly encourage this methodology.
> 
> On my web site (www.n6rk.com) there are photos of my 50 ft
> Glen Martin tower being erected with a falling derrick.
> 
> Rick N6RK
> 
> 
> 
> 
> 
> John Tait wrote:
> >
> >
> > Barry Kirkwood wrote:
> >> Greetings:
> >> Has anyone experience or comments on non telescoping tilting towers?
> >> That is: A rigid tubular or lattice mast with a stub mast and hinge.
> >> In the down posture looks like an assymetrical seesaw.
> >> Remember years back in a photo in the front pages of QST saw one of
> >> tubular
> >> steel maybe 100ft tall.
> >> In my case have a rugged lattice tower, 6x 10ft sections, wondering
> >> about
> >> making it a tilt tower.
> >> Would value any opinions, reports on experience before I spend money on
> >> calculations by a professional engineer.
> >> tnx es 73
> >> Baz ZL1DD
> >>
> >>
> > In one of the old ARRL handbooks, there was  a design for a tiltover
> > tower made of well casing. I've drawn a pic from memory at
> > http://www.iol.ie/~bravo/Well%20Casing%20Tower.htm. A friend EI9FE,
> > successfully built a scaled up version of this, in the region of 90ft .
> >   Vy 73
> >      John EI7BA
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> >
> >
> >
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