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Posted by Clint Dixon on Sunday, August 19, 2007 at 11:52:35 :

In Reply to: Re: Winch Line, how much is enough ? posted by MoparNorm on Sunday, August 19, 2007 at 11:25:03 :

Are you sure that the rating of the Braden MU2 was measured at the second wrap? I thought that method of rating was more common for modern electric winches?

I understood that the rating of the MU2, and maybe other PTO winches, was based upon the strength of the sheer pin. They (MU2) were rated at a higher capacity as time went by and I was told this was due to changing to a larger diameter sheer pin. I would think that with a sheer pin strength method of rating, that the number of wraps of cable on the drum would be meaningless for that information. If the winch is overloaded enough to sheer the pin, this could happen on the first wrap just as easily as the fourth wrap.

I'm just asking. I have not looked deeply into this. I guess I am assuming that you are using "rating" and "strength" as synonomous.

I agree that the truck engine is going to have to work harder pulling 8,000 lbs. on the fourth wrap than it would on the second wrap. This is due to the mechanical advantage decreasing with the increase in "drum" diameter which directly effects gearing.

In any case, I always use a snatch block to double-line the winch cable. I like them not only for the increased machanical advantage that they afford, but also for the reduction in line speed. I have rarely used all 250' for a pull. Usually 20' to 40' does the trick, but this can sometimes be with most of the 250' of cable pulled off the drum or with only 50' feet pulled off.

Junior





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