[AT] 12,000 lb winches

[Stuart Harner]

Think of the extra wraps as increasing the diameter of the drum.

Then think of the drum as a wrench handle. The longer the handle the 
more torque you can put on the bolt.

Now think of it in reverse, the drum is the bolt and can only apply X 
amount of torque. If the drum is small it can put more force on the end 
of the wrench then if the wrench is long.

Basically it is leverage from the point of view of the drum (center of 
rotation).

However, as the cable increases the size of the drum and the rpm of the 
drum is constant, the line speed of the cable increase because it has to 
wrap more cable onto the drum with each rotation.



On 4/20/24 19:20, Dean Vinson 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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