Zeppelin Loop
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It could also be called the Rosendahl Loop, since this knot is just the loop form of the Zeppelin Bend or Rosendahl Bend.  Here's how to tie it:

Step 1:  Tie a thumb knot (overhand knot).

Step 2:  With the end of the rope, follow the standing part (yellow arrow) down through the small upper part of the thumb knot as shown.

Step 3:  Bring the end of the rope forward and then follow the other leg of the loop (yellow arrow) up through the small lower part of the knot as shown to complete the mating overhand knot..


Advantages:  Like the bend, it is exceptionally secure.  It's easy to adjust the loop size and position.  Although it is not as easy to untie as the bend after being heavily strained, it seems to resist jamming.  It can be tied around or through an object.

Disadvantages:  Since it cannot be tied in the same manner as the bend, it may be hard to learn for casual tyers.  Also, it requires a thumb knot to be tied in the rope first, making this loop a two-step operation.

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Tip: Don't let the handedness of the thumb knot you tie for step 1 confuse you if it doesn't match the diagram.  Just remember that when I say "down" in step 2, I mean down toward the bottom of the loop and down into the page.  And, likewise, when I say "up" in step 3, I mean up away from the bottom of the loop and up out of the page.  Just make sure the parts of rope you follow do the same.

Summary of Steps:  Overhand Knot.  Follow Down.  Follow Up.