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Blood Knot TyingOverlap the two lines to be joined. Wrap one end around the other line about six times. Tuck the end back between the lines. Repeat the process with the other line, tucking the end back between the lines in the opposite direction. Tighten and trim. Note: in nylon tightening this knot alters the appearance.
Blood Knot Details
Uses: The Blood Knot is a favorite knot for fly fisherman. It is primarily used to join two lines of similar size, e.g., when joining sections of leader or tippet, and is one of the best knots for this purpose. The strength of the knot depends on making at least five, and up to seven, turns on each side of the center
Pulling the Knot Tight: When lubricated and pulled tight, the knot changes its structure. Pulling on each line forces the wrapped turns to redistribute the twists so that the inner strand becomes an outer wrap (not illustrated in the animation using rope).
Tying it: There are several methods of tying it. The animation shows each half being created separately, which provides a good picture of the structure.
Alternative: An alternative method is to just overlap the two ends and twist them together for about ten to fourteen turns. Then go to the center of the twists and create a hole. Pass the two ends the opposite way through the hole.
Whichever method is used, the knot is usually symmetrical about the middle. Although the twists usually continue in the same direction either side of the center as shown in the animation, it can be tied so that the wraps are mirror images of each other.
Advantages: The Blood knot is a simple, easily learned and very effective way of joining two similar sized lines.
Disclaimer: Any activity that involves ropes is potentially hazardous. Lives may be at risk - possibly your own. Considerable attention and effort have been made to ensure that these descriptions are accurate. However, many critical factors cannot be controlled, including: the choice of materials; the age, size, and condition of ropes; and the accuracy with which these descriptions have been followed. No responsibility is accepted for incidents arising from the use of this material.