The Z-Drag System Exploits The Physical Concept of Work: Work=Force x Distance. Large Distance Values Can Produce A Great Amount Of Force To Pull The Boat Off The Rock (Work)
With 1/2" Nylon Rope, Expect Tension Forces Around 2500 Lbf. Size Pulleys To Match Forces. Be Careful To Spread load Across Multiple D-Rings And Or To RowFrame Chassis.
Since the attached .jpg is marginal, I'll provide a printable pdf on this page.
As an alternate to a Z-Drag, The V-Drag exploits the same principals and is much easier to set up. The V-Drag however is better suited to short distance application of force.
Aluminum Shieve Blocks: 3 pack of the blocks for $50.
