[TowerTalk] Crankup towers-- tiltover

[Dan Hearn]

I built them using 2 aluminum plates about 12-14 inches square. Rather than
using muffler clamps and their U bolts for boom and mast attachment I used 2
muffler clamp saddles opposite each other at each attachment position held
with carriage bolts. The heads are between the two plates. This allows the
plates to rotate against each other. Regular hex head bolts would snag
against each other. A single large bolt at the top of the plates is the
pivot point. I drilled 6 holes thru the 2 plates and when the beam is in
horizontal position I insert 6 bolts and use elastic stop nuts or double
nuts on each bolt. I am using one of the tilt heads on a 6 el 57ft boom 20m
yagi. It works great. Sorry I don't have a picture or sketch of this. I
should have mentioned that the holes where the carriage bolt heads rest were
filed to be square so the bolts don't turn. If this is not clear, will try
to answer any questions.
73, Dan, N5AR

-----Original Message-----
From: Mark Robinson [mailto:markrob at mindspring.com]
Sent: Saturday, September 01, 2007 7:20 PM
To: Dan Hearn
Cc: TowerTalk at contesting.com
Subject: Re: [TowerTalk] Crankup towers-- tiltover


Where did you get the tilt heads from?


thanks  Mark N1UK G3ZZM


----- Original Message -----
From: "Dan Hearn" <dhearn at air-pipe.com>
To: "Jim Jarvis" <jimjarvis at optonline.net>; <towertalk at contesting.com>
Sent: Saturday, 01 September, 2007 10:16 PM
Subject: Re: [TowerTalk] Crankup towers-- tiltover


> Interesting idea Jim. Come to think of it, I have tilt heads on all of my
> yagis so could tilt the Yagi over, tie it in that position, then tilt the
> tower over if desired. I still think it is simpler to just lower the yagi
> vertically and avoid unbolting and tilting the tower. To each his own, Hi
> 73, DAn, N5AR
>
> -----Original Message-----
> From: towertalk-bounces at contesting.com
> [mailto:towertalk-bounces at contesting.com]On Behalf Of Jim Jarvis
> Sent: Saturday, September 01, 2007 6:08 PM
> To: towertalk at contesting.com
> Subject: Re: [TowerTalk] Crankup towers-- tiltover
>
>
>
> On my Rohn 45G foldover in Vermont, I fabricated a bracket
> system which kept the yagi horizontal,while the tower folded
> over.
>
> This allowed full lowering, and prevented skewering the roof
> when the tower folded over, plus walking height maintenance.
>
> The idea was published in one form, in RadCom, back in the late
> 90's.  I took pics and wrote an article on my variant of it,
> for QST, but never submitted it for publication.  Still have
> the pics,somewhere, I believe.
>
> If TT feels it's worth publishing, as a concept, I'll
> submit it to QST.
>
> If anyone needs specific details/pics, I'll look for
> same.  I know where the prototype is, and can recover
> it, if needed.
>
> N2EA
>
>
> Jim Jarvis, President
> The Morse Group, LLC
> 732 548 5573 office
> www.themorsegroup.net
> results at themorsegroup.net
>
> Strategic Planning and Success Strategies
> for Sales Professionals and Entrepreneurs.
>
> Sales Excellence Series beginning September 24, 2007
>
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