It's worth taking a detailed look at the specs on that Harbor Freight winch
(Assuming you're talking about the Chicago Electric 40764-0VGA, 8000 pound
winch) to understand why it's probably not appropriate for Harold's need.
A few points: It's not fast enough for Harold.. 13 ft/min w/no load,
dropping off with load as expected. (by the way, the difference between
noload and fully loaded gives you way to estimate gear train losses)
1.8 HP seems a bit optimistic: 12V @37.5 Amps is 450 Watts... Since 1HP is
about 750W, that seems more like a 1/2 HP. Maybe 37 A is the noload
current. Even if you are generous and claim 14.4V, it still doesn't get you
to 2HP. Since Harold needs 1/4 HP out, given the usual inefficiencies, I'd
say he needs a 1-2 HP motor on the winch, depending on whether it's starting
under load, etc. And, presumably, he needs that continuously.
Note also that the manual gives 1minute as the max run time at full load
without overheating. You're not going to be cranking up a 100 foot tower
very quickly with this thing. (considering it's for automotive use, the 1
minute is impractically short.. You're not going to be dragging that SUV out
of the mud at 4.5 ft/min in one minute bursts with the probably 10 minute
cool down required)
As a practical matter, 12V winches are going to be pretty expensive and
inefficient compared to a 110V, except for possibilities of economies of
scale. (i.e. if you are making zillions of them in China, compared to just a
few in the US). Wiring is a big issue...
----- Original Message -----
From: "Mike Wetzel" <mjwetzel@comcast.net>
To: <rowald4@midamer.net>; <towertalk@contesting.com>
Sent: Friday, January 02, 2004 4:51 PM
Subject: RE: [TowerTalk] AC electric winch
> Harold,
>
> I just noticed that Harbor Freight has an electric winch on sale for $300
> (regularly $400), you might look into it.
>
> Mike W9RE
>
> > -----Original Message-----
> > From: towertalk-bounces@contesting.com
> > [mailto:towertalk-bounces@contesting.com]On Behalf Of Laura Rowald
> > Sent: Friday, January 02, 2004 3:32 PM
> > To: towertalk@contesting.com
> > Subject: [TowerTalk] AC electric winch
> >
> >
> > Yes, I am looking for an AC electric winch that will pull a load of up
> > to 150 pounds in a vertical direction. Also I need the line speed to be
> > at least 60 feet per minute. I also need the winch to be able to have
> > power out for reverse winding.
> >
> > Thank you,
> >
> > Harold Rowald
> >
> > _______________________________________________
> >
> > See: http://www.mscomputer.com for "Self Supporting Towers",
> > "Wireless Weather Stations", and lot's more. Call Toll Free,
> > 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
> >
> > _______________________________________________
> > TowerTalk mailing list
> > TowerTalk@contesting.com
> > http://lists.contesting.com/mailman/listinfo/towertalk
> >
>
> _______________________________________________
>
> See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless
Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any
questions and ask for Sherman, W2FLA.
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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