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ROPE JACK & Pull line at 1:1, 2:1, 3:1, 4:1

Tensioning a Pull-line with the CMI ROPE JACK - a demonstration of the ROPE JACK at 1:1, 2:1, 3:1 & 4:1. Four Mechanical Advantage techniques are demonstrated using Rope Jack to tension the line. This is just a demonstration of the potential of the Rope Jack for tensioning a line. Detailed Mechanical Advantage instruction is beyond the scope of this video. Typically, a 100 pound pull of one-person with one-hand on the handle, the 5:1 Mechanical Advantage of the Rope Jack can apply 500 pounds of force directly to a pull-line - well within the load capacity of the cams and rope. When coupled through one pulley at a 2:1 MA, that same Rope Jack force can load the pull-line to 1000 pounds. When coupled through two pulleys at a 3:1 MA, the resulting pull is 1500 pounds. And, When coupled through two pulleys in tandem at a 4:1 MA, the load on the pull-line is 2000 pounds. The Rope Jack (practical upper limit at 1:1) can apply nearly 800 pounds of force directly to a pull-line. Correspondingly, through a 2:1 the Rope Jack can apply approximately ~1600 pounds; 3:1 = ~2400 pounds; and 4:1 = ~3200 pounds. Safe use of the Rope Jack is the responsibility of the user. Details can be found at CMI: https://www.cmi-gear.com/products/rop...