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ratchet-strap-parts.pngCalculations: ratchet strap tensioning

The leverage provided by the ratchet lever over the slotted drum on a quality 1 inch ratchet strap is about 11-1/2:1. If you allow for a small amount of friction loss and apply the force perpendicular to the ratchet lever you will end up with about 11 pounds of tension in the tie-down for each pound of force applied to the ratchet lever.