[TowerTalk] Re: TowerTalk Digest, Vol 23, Issue 47
KJ0M
kj0m at mchsi.com
Fri Nov 12 11:42:21 EST 2004
>
>Message: 1
>Date: Fri, 12 Nov 2004 08:49:13 -0500
>From: "Pat Chiles" <chilesp at adelphia.net>
>Subject: [TowerTalk] US Tower Raising Fixture Question
>To: <towertalk at contesting.com>
>Message-ID: <001d01c4c8be$65045260$0200a8c0 at PATXP>
>Content-Type: text/plain; charset="iso-8859-1"
Pat Chiles, chilesp at adelphia.net wrote:
>
>I took delivery of my new tower yesterday and with the help of Pete,
>N4ZR, and a neighbor who owns a front loader I now have it standing
>on the pad and plumbed up.
>
>Cranking this tower (HDX 555) from horizontal to vertical was
>unexpectedly very hard. The only additional weight was a 140 lb
>mast snuggled inside the tower. I could only do about 10 complete
>rotations and then had to take a break and I am a fairly big boy and
>in fair shape.
>
>My question is what have others done to lessen this burden? Is
>there a better winch or rigging scheme to gain mechanical advantage?
>My tower has two side-by-side pulleys on the tower, but only one is
>used.
Both are used on my tower.
> The raising fixture only has one pulley.
Mine has 2 on the fixture also.
>The cable goes over the pulley at the raising fixture, around one of
>the pulleys at the tower, and back to the raising fixture where it
>is terminated on a bolt. We have it rigged per the instructions.
Mine goes back again to the tower through a second pulley on the
fixture, to the second pulley on the tower and then back to the
fixture terminated with a bolt, as you see. This appears to double
the mechanical advantage? Physics types could tell you.
I can crank my tower (TX-472) very easily with one hand without a
break. It comes up very slowly, but that's due to the mechanical
advantage of the pulleys. I have a Force 12-5BA (~85 pounds) and
Force 12-240/230 (~50#) and a mast of over 100# on my tower. I've
even had my wife crank the fixture just to show her how easy it was.
Perhaps they only use 1 pulley because you've got 1 less section with
a 555 vs a 472 tower? Only guessing, but I would think the extra
advantage of the second pulley would make all the difference in the
world.
--
73,
de KJ0M
Jim
._._.
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