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I've read about something called a Z-Rig. Is this the same set-up that Sherrill shows for use with a speedline? Also is the mechanical advantage 3:1 on this set-up.
Originally posted by Mike Maas
What kind of pulleys did you use?
What prussic did you use, and at what force do you think the prussic would slip?
Originally posted by TheTreeSpyder
.
The position i outlined was as a one way brake for the control leg of a 3x1 in a ZRig. In this position, the device only digs in the line at 200# with 200# pull. Another diffrence is in this position the device clamps tight in between pulls, instead of during your pulls.
Originally posted by Oxman
There's a nice article called "Understanding Mechanical Advantage" in the Fall 2002 issue
of "Western Arborist", the magazine of the Western Chapter of the ISA. "Understanding Mechanical Advantage" was written by
Peter S. Donzelli, Ken Palmer, Rip Tompkins and Stanley Longstaff.
For those who don't live on the west coast, this article also appeared in the June 1998 issue of Arborist News magazine. It is scheduled to be included in a compendia of CEU articles that the ISA plans to publish this summer.
Mahk
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