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KA

← Where the theory applies
Terminal — hardware eye

Davy Knot

Constriction · Wrap stack

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.

Finished structure

No drawing of this exact knot yet. The written steps are the reference.

HTH · Reference layout

Davy Knot — finished-state checks, on the shared reference layout

Davy Knot — finished-state checks, on the shared reference layout
Hook the Horizon reference plate
Failure modes

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

Fly / tippet family

Fine tippet at the eye, or fly-line to leader with a tube or nail.

  • !Hitch path around the eye instead of through it
  • !Single pass where two were the job
  • !Gap at the tube or nail on a fly-line join
Fails when
  • !Tag tucked on the far side of the overhand, making a slip knot that pulls apart
  • !Tag slid away from the knot toward the middle of the eye
  • !Tippet too fine for the hook wire, so a load spreads the loop and releases the tag
  • !Standing line pulled before the tag, so the knot seats half-formed
Geometry

  • Wrong hitch path — an overhand that slips

    Opens on the first tug-test

    Davy is a single hitch around the standing tippet, not a wrap stack · step 02

  • Hitch not slid to the eye

    Opens under load, especially on an oversized fly

    The seat against the eye is the lock; step up to Double Davy if it will not hold · step 03

  • Tag trimmed before the hitch locked

    Unlocks as soon as the tag is cut

    Over-trimming before the seat is the usual Davy pull-out · step 04

If you saw this

  • Hitch opens under load

    Check

    • ?Hitch tight against eye

    Then

    • →Retie
    • →Step up to Double Davy

  • Finished check failed — Open hitch that walks on the eye

    Check

    • ?Compact half-hitch structure at the eye
    • ?Tag exits in the intended direction
    • ?Knot stays small after seating

    Then

    • →Retie. A walking Davy slips free under tippet-class loads.

  • Wrong hitch path — an overhand that slips

    Check

    • ?Opens on the first tug-test
    • ?Inspect step 02

    Then

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

  • Hitch not slid to the eye

    Check

    • ?Opens under load, especially on an oversized fly
    • ?Inspect step 03

    Then

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

  • Tag trimmed before the hitch locked

    Check

    • ?Unlocks as soon as the tag is cut
    • ?Inspect step 04

    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

  • ·The eye is hardware. The knot is an open tangle around that eye. Ends stay ends.
  • ·Seating (wet set, even wraps, tag orientation) is the mechanical record already on the knot. Theory adds no extra rating.

What topology does not predict

  • ·Trefoil / unknot classification does not apply to a Palomar or clinch.
  • ·Fluoro glaze, pigtail slip and nick-at-the-guides are forensic, not topological.
  • ·No strength percentage is computed here.

Not for

  • ·A free-swing lure loop — use a non-slip loop family
  • ·Using an invariant as a reason to keep a glazed terminal
  • ·Large flies under heavy tippet (prefer Double Davy or Orvis)
  • ·Braid terminals

Same pattern, different job

Sources