Hi Bill,
Thank you, thank you, and thank you for this revealing explanation. I can see
that we agree on this interesting and, apparently, perplexing problem in pullys
and mechanical advantage.
Stan w7ni@teleport.com
Bill Aycock wrote:
> Kurt- because you are a professional stress man, I hate to tell you this,
> but the use of a pulley system DOES reduce the load on the top.
>
> Consider the static case of a 400 lb weight hanghing on a three-to- one
> block and tackle- balance this with a 133 lb weight on the single down leg
> - the total weight is 533 lbs, but the system balances.
>
> Lokk another way- the tension on the rope is 133 lbs EVERYWHERE. the total
> of the three in the tackle is 400 lb- the single down line is 133 lb- the
> system is in balance. with 533 lb pulling down on the upper point of
> attachment of the set-up.
>
> Bill- W4BSG
> -
> Bill Aycock --- Persimmon Hill
> Woodville, Alabama, US 35776
> (in the N.E. corner of the State)
> W4BSG -- Grid EM64vr
> baycock@HiWAAY.net
>
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