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Zar x recovery stuck7/5/2023 The Surface and Slope resistance values used in the STOPA Checklist are all that are needed to calculate approximate winching loads. This is not necessarily wrong, but with today’s modern pulley (“snatch”) blocks it’s really not needed, according to Wreck Master, the preeminent North American tow truck training company. Some winching worksheets found in literature add in a resistance value for each pulley block in a rigging setup to the total load resistance number. There are no “Pulley Block” resistance values found anywhere on the chart or in the STOPA checklist. CORRECTION NOTE: There is a minor correction to the title of Chart 2 in the printed version of the article “Recover With Confidence – Conducting a Stuck Assessment and Formulating a Recovery Plan.” The title of Chart 2 in the STOPA Checklist should be: Approximate Slope Resistance Values.
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