![]() We have all heard about “staying out of the bight”, which infers being clear of inside block angles and areas that can be in the line of fire if one experiences a sling or equipment failure. ![]() These significantly influence the winch pull required and the sizing of the equipment winch, snatch blocks, slings and shackles.ģ. Correctly accounting for the height, run and ramp length will help determine the values needed for either the Uphill or Downhill formula. Using a dynamometer in the winch line during a level pull can help finalize the approximate CoF for a particular set of rolling equipment.Ģ. Discovering the CoF while on a level plane is especially is helpful to refine the calculation for an uphill pull. 02, while steel rollers like those produced by Hilman, Multi-ton and Heavy Haul typically have a CoF of. Synthetic wheels such as provided with a common 3-point industrial rolling system offer a CoF of about. You’ll notice the formulas offered from ITI’s Master Rigger’s Reference Card (at right) provide the means to calculate the required force if faced with a pull on a Level surface, Uphill or Downhill. Know the load’s weight and the rolling equipment’s CoF (coefficient of friction). Here are three key points that the rigging crew should address to ensure a successful operation.ġ. ![]() When towing or pulling a load up an incline the effort increases with the slope.
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