[AT] 12,000 lb winches

Sat Apr 20 20:35:33 PDT 2024

 I would rewrite that as follows: Larger Diameter spool = longer moment arm = maximum torque. However, if the load is at the maximum rating of the winch it will draw the most amps resulting in a shorter duty cycle. Higher Amps = Higher Heat. The winch design determines how much heat it can dissipate in a given period of time. Heat equal Watts. Watts = I X I X R. I've seen specs on a given winch that defines its duty cycle at full load of 45 seconds with 15 minutes to cool off. A design that draws less current at full load or one that dissipates heat faster will have a better duty cycle. Fortunately for me a 12,000 lb winch will never be at full load pulling an 8000 lb tractor up the slanted bed therefore I should not have to worry about duty cycle given it will take less than a minute to pull the tractor on the trailer. I don't need to pull the tractor the full 20'.  Just enough to get about 15 to 20% tongue weight. Interestingly that is about where it has to be to get the fenders back on. I may reduce the width of the rear tires on the 720 Standard so I don't even have to worry about that. I had both rear wheels off to remove 2000lbs of rear wheel weights. I don't know what possessed me to not get them set right then. I don't even want to think about the physics that are dynamic due to the deck tilting flat the minute the tractor gets past center. I would guess that happens when the rear wheel axles get past 12' or so.  I've weighed the tractor, but I failed to weigh the front axle vs the rear axle. I know on Row Crop tractors it is about a 70% rear vs front. I don't know about Standard versions. My gut tells me it might be a little more balanced. 
    On Saturday, April 20, 2024 at 05:24:09 PM PDT, Dean Vinson <dean at vinsonfarm.net> wrote:  

Gents, what’s the physics behind the capacity reductions with successive wraps of the cable?   Larger diameter spool = longer moment arm = takes fewer pounds to reach the rated torque?

Dean Vinson

Saint Paris, Ohio

From: AT <at-bounces at lists.antique-tractor.com> On Behalf Of Dean VP
Sent: Saturday, April 20, 2024 6:09 PM
To: Antique Tractor Email Discussion Group <at at lists.antique-tractor.com>
Subject: Re: [AT] 12,000 lb winches

Yup.  I don't know how many feet are on each wrap or how many wraps there are yet but my guess with an 80' plus cable the first wrap is probably un wrapped in less than 20'. Looping back 20' gains more in pulling power than is lost in the wraps on the winch.  On a straight pull back one could add an additional extension cable to keep the wraps on the winch but it is kind of a hassle to disconnect the extension rope and connect direct. Makes sense if one is pulling something out of a mess of in the distance but not sure if it makes much sense of the tractor can be backed up to the back of the 20' trailer.

On Saturday, April 20, 2024 at 02:39:42 PM PDT, <rdhaskell at juno.com> wrote: 

Or shorten the cable.

On Sat, 20 Apr 2024 21:26:46 +0000 (UTC) Dean VP <deanvp at att.net> writes:

Ron,

All the more reason to buy a winch with excess capacity.

On Saturday, April 20, 2024 at 01:49:03 PM PDT, <rdhaskell at juno.com> wrote: 

Remember the 12,000 rating is on the first wrap of the cable, once you

start the second wrap deduct 10%.  Another 10% on the third, and 10% more

on the fourth.

Ron Haskell

Riverside CA

USA

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Ron Haskell
Riverside CA
USA

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