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Re: [TowerTalk] HF winch

To: john@kk9a.com
Subject: Re: [TowerTalk] HF winch
From: Mike Reublin NF4L <nf4l@comcast.net>
Date: Mon, 3 Feb 2014 09:19:50 -0500
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
Hi John,

I'm not an engineer, nor have I stayed at a Holiday Inn Express lately... ;-o} 
but I have seen one on TV.

The pull will at worst be at about a 45 degree angle, and using double pulleys 
effectively halves the load to about 600 lbs. I don't think the pull could be 
more than the weight, unless it were horizontal, then you'd have to account for 
friction or the fact that the load is pinned in place by the base bolts.

I don't know if that would actually cut the draw to something the PS could 
handle, but the 55 amps is for a 1000 lb. pull. The power leads are 10 ga. 
stranded.

Maybe we can get an engineer to chime in.

Mike NF4L


On Feb 3, 2014, at 8:53 AM, john@kk9a.com wrote:

> I am not a mechanical engineer, wouldn't the pull on the cable be
> significantly more than the weight of the tower when tilting it?  Then you
> plan on running a 55 amp motor with a 20 amp power supply?
> 
> John KK9A
> 
> 
> To:    towertalk reflector <towertalk@contesting.com>
> Subject:       [TowerTalk] HF winch
> From:  Mike Reublin NF4L <nf4l@comcast.net>
> Date:  Mon, 3 Feb 2014 07:46:27 -0500
> 
> I picked up a 2500 lb. rated 12V. winch from Harbor Freight intending to
> use it
> for tilting my HG-70HD tower. Weight with antennae and rotor etc. is between
> 1200  and 1300 lbs.  I was hoping to run it from a 20A power supply.
> 
> I plan on a pulley arrangement that will give me a 2:1 advantage. I could
> go to
> 3:1.
> 
> If I read the specs right, the winch draws 55 amps when the load is 1000 lbs.
> The duty cycle is 45 seconds on, 14 MINUTES off. Mounting is 2 bolts,
> M8-1.25x35 mm.
> 
> Seems a tad sketchy. Your opinion?
> 
> 73, Mike NF4L
> 
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> 
> 
> 
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