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Unless they are braided, common ropes are made by twisting fibers (usually) to the right into lengths called yarns. Yarns are then twisted together to the left and called strands. Strands are twisted together to the right. Most braided rope has a woven shell surrounding a core of fibers. It is more flexible and has less stretch than twisted rope. When the strands are twisted to the right, it is said to be "laid" right-handed. So heavy rope laid this way should be coiled in a clockwise (left to right) manner. It is these twists in rope that give most knots their gripping power. So, a knot that works well with rope may slip apart when tied with a smooth monofilament fishing line. When a knot is tied, fibers become bent, stretched, squeezed and broken. This weakens the strength of the rope, knots may be rated by percentages of how much havoc they cause on the overall strength of the rope. Some knots weaken a rope by 20%, some 50%. Add to this the age and the amount of use the rope has seen. For this reason, the rope and knots used for climbing have to be chosen with care. Overhand - Overhand Loop
It is difficult to untie and weakens the rope. But it is the foundation of many other knots that you will find useful.
You can use a variation of this to tie two lengths together, instead of doubling up one line, hold two lines together, and tie both as if one line, and form an "X" or a "Y" they will not come apart or slip. If you pass the doubled up end through the eye of the loop a second time, you will form a "surgeons loop" that is slightly stronger. Reef Knot, Half and Double Hitch
Another way to tie this is tie two ends together as an overhand, then tie the two ends together a second time. When tied properly, the two ends will exit from the same side. If tied improperly, you will get a Granny knot.
Figure of Eight, Bowline
Figure of eight, another stopper knot, is larger than the overhand. It can be tied and untied and has less impact on the overall strength of the rope. You can double up a length of line and tie a figure eight and produce a better all around fixed loop.
Anchor Bend, Fisherman's Knot
Trilene, Surgeons Knot
TIP: Monofilament line should be moistened before closing the knot to keep down friction heat that can weaken the line.
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