20:19
This is how simple pulley systems work - Rope Access Rigging
5:33
Building Mechanical Advantage (3:1 or 5:1)
3:37
4:1 Mechanical Advantage w/ double sheave pulleys
3:35
DJ Z Rig
13:06
MPD - Basic Rope Rescue System
21:30
Mechanical Advantages: Counting Tensions and Estimating System Efficiency Part 1
29:51
Low Angle Rescue Training
16:37