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Bend — two lines

Zeppelin Bend

Wrap stack · Constriction

DiagramsHow to tie it

Does not pick a knot

This page does not pick a knot for you. DNA, molecules, quantum braids and vortices stay off Decide.

Zeppelin Bend, finishedZeppelin Bend, finished

Finished structure

Drawn from a rope model of this knot: which strand passes over which comes from where the rope actually lies.

Failure modes

When this family fails, it fails as these. The recovered end still outranks the name.

Interlocking-bend family

Two interlocking overhands or a Carrick lattice — tails on the documented sides.

  • !Tails on the wrong sides of the bend
  • !Broken lattice or a reef-knot form in disguise
  • !Undressed so one overhand takes the whole load
Fails when
  • !A working end slides back through the shared hole during tightening, so the knot sets lopsided and has not locked
  • !The loops have the same handedness, which ties Hunter's bend. Animated Knots calls it less satisfactory and hard to tell apart.
  • !One working end goes through only its own loop instead of through both loops, which leaves the knot incomplete
Geometry

  • Both working ends on the same side

    Bend will not lock and spills under load

    The 6 and the 9 must have opposite working ends · step 02

  • One end missing the second loop

    Unfinished 6-and-9 — looks like a sheet bend and will slip

    Each working end must pass through the centre of both loops · step 03

  • Used on a large diameter mismatch

    Thinner rope walks out of the lock

    Similar diameters only; mismatch is a double sheet bend · step 01

If you saw this

  • Bend spills or will not dress into two loops

    Check

    • ?Opposite working ends
    • ?Two interlocked loops

    Then

    • →Retie the 6-and-9
    • →Step to double sheet bend on a mismatch

  • Both working ends on the same side

    Check

    • ?Bend will not lock and spills under load
    • ?Inspect step 02

    Then

    • →Retie. Do not dress a defective structure and call it seated.

  • One end missing the second loop

    Check

    • ?Unfinished 6-and-9 — looks like a sheet bend and will slip
    • ?Inspect step 03

    Then

    • →Retie. Do not dress a defective structure and call it seated.

  • Used on a large diameter mismatch

    Check

    • ?Thinner rope walks out of the lock
    • ?Inspect step 01

    Then

    • →Retie. Do not dress a defective structure and call it seated.
Same family

Same failure class, different geometry. Open the plates — Diagnose still starts from the symptom.

This failed — start Diagnose

What holds it

  • ·A bend captures two working ends. Holding is constriction and the seated wrap or barrel — not a closed-knot invariant.
  • ·Unequal diameters and slick pairs (braid to fluoro) are material problems. Crossing number does not rank FG against a Double Uni.

What topology does not predict

  • ·A Jones polynomial does not pick a braid-to-leader family.
  • ·Published retention bands stay as cited on the knot record. This page does not invent one.
  • ·Guide-click and tag-trim are field geometry, not topology.

Not for

  • ·Attaching a single line to a spar or cleat — that is a hitch
  • ·Reading this page as a recommendation from Decide
  • ·A 10-second join you will cut anyway (sheet bend is faster)
  • ·Extreme diameter mismatch (double sheet bend or splice)

Same pattern, different job

No sourced twin among these knots. Related knots stay on the Library card.

Sources