what knot for winching?

[Fairfield]

Eight on a Bite as strong as the come.

 

[Jsin]

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I use a catspaw. quick simple.

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Mtnman8, I was just about to type the same thing.Only thing that I would say is make about 7-9 rolls in the rope to make a nice handle to take of the hook. Jsin

 

[mtnman8]

Yup I count 6 as a min usuallly go for 8

 

[cory]

Same here most of the time. Sometimes for a heavy pull bowline on a bight.

 

[cory]

Cat's paw that is.

 

[Steve_Hansen]

I use a port-a-wrap.

 

[SRTTech]

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The prussic is nice because of the ability to slide it up and down a line, however in the past I have seen at least once a prussic that had failed under loading. It might have been Brian Kane who was pulling something over or pre-tensioning a line for a speed line and the prussic slipped BIG time.

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if the prussik slipped, then the entire system was overloaded. Prussiks are a fail safe way of determining system overload, because they consistently slip between 8 - 10 KN. Better to have a prussik slip than a winch rope snap and violently richochet. In any case, two to three prussiks shoud be used in tandem to connect to the bull rope (when winching). This spreads out the constriction on the bull rope, but still allows slippage if overloaded.

I have successfully winched out a 10 ton dump truck form a ditch, using a 4:1 mechanical advantage system, a winch at the end, a bull rope, and three 8mm polyester sheath prussiks.

setup like this:

anchor / winch / winch cable+hook / 4:1 mechanical advatage pulleys + 5/8" static line (20,000lb mbs)/ 100kn mbs steel biner / 3 8.5mm prussick loops / bull rope / stuck truck.