In this video we look at using snatch rings, X-Rigging rings, blocks, and pulleys to create different mechanical advantage setups for tree work.
Efficiency ratings:
5/8" CMI Block - 91.2%
X-Rigging Beast Ring, loaded "snatch" style - 79.5%
Schtumpa snatch ring - 75.2%
7/8" Steel shackle - 62.5%
DMM Steel Carabiner - 59.8%
2:1 Pull Testing
CMI Block - 2.0 : 1
X-Ring - 1.86:1
Snatch Ring - 1.71:1
Trucker's Hitch 3:1 setup
with Snatch Rings - 2.35:1
with pulleys - 2.88:1
Spanish Burton 4:1 setup (2:1 on a 2:1)
with Snatch Rings - 2.88:1
with 1 X-Ring and 1 Snatch Ring - 3.02:1
Check out Robert Pepper's Youtube channel @L2SFBC for more detailed testing of snatch ring pulling setups:
https://www.youtube.com/@L2SFBC
"We are all apprentices in a craft where no one ever becomes a master." - Ernest Hemingway
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