A prusik (otherwise called a grating hitch) is a short piece of string which can be folded over your grappling rope to add contact. They can slide all over effectively, yet lock around the rope when weighted.
They are most regularly utilized for abseiling but on the other hand are unbelievably helpful in an assortment of crisis circumstances like climbing a rope or getting away from the framework.
Four kinds of prusik tie (contact hitch) are portrayed underneath:
– Autoblock (French)
Prusik Cord: Size
The width of your line ought to be 60% to 80% of the rope’s measurement, regardless of whether you are utilizing the prusik on one rope or two. In the event that you utilize a line that is excessively dainty, it will fix effectively around the rope and will be hard to move openly. On the off chance that you utilize a string that is excessively thick, it will not have sufficient grating to secure when you need it to.
As a rule, 6mm line functions admirably on 10mm ropes, though 5mm rope is better for 8mm ropes.
The string length ought to be 1.2m – 1.5m.
Prusik Cord: Material
Prusiks are generally made out of nylon string, integrated with a twofold angler’s curve.
On the off chance that the line is excessively hardened, it will not lock as expected around the rope. The firmness may likewise make it hard to make the actual bunch. Test your line before you take it climbing so you can be certain that it works.
In case you are wanting to utilize your prusiks often, you ought to consider getting some pre-sewn prusik circles. These arrive in an assortment of structures, either without a cumbersome bunch or with the bunch sewn together and covered by a plastic sleeve.
Prusik Types: The Classic
– Very secure when stacked
– Locks in the two ways
– Often hard to deliver when firmly stacked
– In circumstances where you don’t have to continue sliding the prusik (e.g; getting away from the framework)
Instructions to Tie the Classic Prusik
Pass the line around the rope and through itself as displayed, ensuring the twofold angler’s twist is toward the end.
Pass the string around the rope and through itself once more.
Make no less than three folds over the rope, pull the string tight and cut a carabiner through the circle. Ensure the bunch is flawless.
Squeeze the bunch to release it. This permits you to drop it up or down the rope. Weight the bunch one or the other way to lock it. On the off chance that the bunch stalls out, you can push some line in from the focal point of the bunch to extricate it.
Prusik Types: The Autoblock (French)
– Easy to tie and loosen
– Can be delivered under load
– Tends to slip when used to climb ropes
– As a back-up while abseiling
The most effective method to Tie the Autoblock Prusik
Wrap the prusik perfectly around the rope a couple of times as displayed.
Clasp the finishes along with a carabiner. More wraps will make more rubbing around the ropes, however four wraps are for the most part enough. Ensure the autoblock is slick and the twofold angler’s bunch is away from the ropes.
Squeeze the bunch to extricate it. This permits you to drop it down the rope. Weight the bunch to lock it. The autoblock secures the two bearings, however the twofold angler’s bunch will in general wrap itself into the prusik when the heading is exchanged, making it considerably less successful.
Prusik Types: The Klemheist Knot
– Easy to deliver in the wake of being stacked
– Can be attached with webbing
– Only works a single way
– Ascending a rope
Instructions to Tie the Klemheist Knot
Wrap the prusik conveniently around the rope a couple of times as displayed.
Pass the remainder of the rope through the circle.
Weight the bunch downwards to lock it, or push it upwards to deliver.
Prusik Types: The Bachmann Knot
– Easy to work when wearing gloves
– bad on frosty or smooth ropes
– Doesn’t grasp just as different sorts of prusik
Rising ropes when wearing massive gloves
The most effective method to Tie the Bachmann Knot
Clasp the string through a carabiner.
Fold the string over the rope, taking care of it through the carabiner each time. Keep the wraps cozy to one another.
Permit the finish of the string to hang down through the carabiner. Clasp your heap to this end. Try not to cut your heap to the carabiner what capacities as the ‘handle’ – this will deliver the bunch!
Push the handle carabiner up the rope to deliver the bunch. Weight the lower carabiner to lock it.
Prusik Cord Tips
– Prusiks are not original capacity connection focuses. Continuously have a back-up so you’re joined to the rope ‘appropriately’.
– Make sure not to wrap the twofold angler’s twist into any grinding hitch. This will significantly diminish the bunch’s adequacy.
– The quantity of wraps ought to be expanded or diminished relying upon the rope firmness, rope breadth and dampness conditions, with three wraps as a base. Prior to utilizing any prusik tie, test it to see that it grasps and deliveries well.
– If you don’t have a prusik line, you can utilize a sling all things being equal. Slings don’t work very also yet it’ll assist you with escaping an interesting circumstance. A limited nylon sling is better compared to dyneema (spectra). Try not to utilize a sling for anything aside from a prusik in the wake of utilizing it once as a prusik.
– If utilizing prusiks in conditions where they may fizzle (e.g; prusiking up a wet or frigid rope), it’s smarter to utilize two unique sorts of grinding hitch (and an original capacity back-up, obviously). On the off chance that conditions exist to make one slip or fall flat, the probability is that the other prusik would not come up short under similar conditions.
– Check your prusik string for mileage routinely. Ensure the twofold angler’s bunch isn’t slipping and the string isn’t rubbed. At the point when it’s looking worn, resign it and get another one – string is modest.