Tugboat hitch
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The Tugboat hitch is a special knot, ideal for heavy towing and it is easy to release, even under great load. It is the canonical name of knots for heavy towing uses.
Form
Take one (single turn) or two turns (round turn) around the towing post, cross the bight under, then drop the bight over the top. Now loop the bight back around the standing part, drop the bight over the top with a half twist, and pull taut.The tugboat hitch is also known as the Lighterman's Hitch. In Ashley's Book of Knots (pg. 304, knot # 1795) this knot is called "Backhanded Mooring Hitch."
Example: [Image no.2 on this link:]
See also
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