Double Davy Knot
Constriction · Wrap stack
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.
Double Davy Knot — finished-state checks, on the shared reference layout
When this family fails, it fails as these. The recovered end still outranks the name.
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
- !Tag end pulled away from the eye, out from under the knot
- !Very light tippet, about 4X to 6X, tied to a heavy-wire hook
- !Only one tuck made on a larger fly or heavier tippet
- !Standing line pulled before the tag, so the tag can slide out
Stopped after one pass
That is a Davy — the usual pull-out on a larger fly
The second pass is why this knot exists · step 02
Second pass never seated to the eye
Opens under load on anything bigger than a small dry
Incomplete second pass is the Double Davy failure · step 03
First pass cinched so the second cannot enter
You cannot add the security pass after a hard first seat
Leave the first hitch open enough to take the second pass · step 01
Opens under load
Check
- ?Both passes visible and tight
Then
- →Retie carefully
Finished check failed — Only one pass completed
Check
- ?Second pass completes before the final draw
- ?Compact seat at the eye
- ?Tag controlled and short
Then
- →Retie. Incomplete double structure reverts to a weaker single Davy.
Stopped after one pass
Check
- ?That is a Davy — the usual pull-out on a larger fly
- ?Inspect step 02
Then
- →Retie. Do not dress a defective structure and call it seated.
Second pass never seated to the eye
Check
- ?Opens under load on anything bigger than a small dry
- ?Inspect step 03
Then
- →Retie. Do not dress a defective structure and call it seated.
First pass cinched so the second cannot enter
Check
- ?You cannot add the security pass after a hard first seat
- ?Inspect step 01
Then
- →Retie. Do not dress a defective structure and call it seated.
Same failure class, different geometry. Open the plates — Diagnose still starts from the symptom.
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
- ·Absolute smallest midges where a single Davy is enough
- ·Heavy saltwater terminals and braid
Same pattern, different job
- Diagram in reviewDavy Knot
One pass is a Davy. Two passes are the double.
- Knot — practical vs mathematical (Wikipedia) — Closed-curve knot theory ignores friction. Practical knots are classified by function.
- Patil et al. — Topological mechanics of knots and tangles (Science, 2020) — Lab rods: simple topological counts correlate with stability. Not a field rating table.
- NetKnots — Double Davy Knot
- FishingKnots.com strength database (Double Davy band) — Recovered from the historical MODEL_SOURCES registry.
- Hook the Horizon — Double Davy — Recovered from the same record’s historical Hook the Horizon resource URL.
- AnimatedKnots — Double Davy Knot | How to Tie the Double Davy Knot — Cited tying video already attached to this record.