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Where the theory applies
Loop — fixed

Cat's Paw

Interlock

Does not pick a knot

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

Cat's Paw — finished structureFinished structure. Two finished loops interlocked as a handshake — neither loop cinched around the other.
finished · schematic

Two finished loops interlocked as a handshake — neither loop cinched around the other.

Finished structure

Two finished loops interlocked as a handshake — neither loop cinched around the other.

Failure modes

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

Loop-to-loop family

A loop that either stands as a dropper or handshake onto another loop.

  • !Dropper loop collapsed into an overhand
  • !Handshake twisted so one loop saws the other
  • !Loop sized after it was already loaded
Fails when
  • !The turns cross or stack on each other, so one turn carries most of the load instead of all of them sharing it
  • !There is no double line behind the join, or the Bimini twist wraps have slipped
  • !Too few passes were made, so the load sits on fewer turns where the loops bear on each other
  • !One loop rides over the other, leaving a lopsided collar that catches on the rod tip guide
Geometry
  • Fewer than five passes — a girth hitch

    Load lands on one crossing and saws the loop apart

    The paw spreads load across five nested turns. Two or three is a girth hitch, which loads a single bearing point. · step 02

  • Turns riding over each other instead of nesting

    The advantage of spreading the load is lost

    Nested turns share the load; stacked ones do not. · step 03

  • Built on a single strand rather than a double

    The connection is limited by one strand of main line

    The paw transfers load between loops; it does not create strength. · step 01

  • Collar lopsided, one loop riding over the other

    Uneven bearing and a connection that snags at the tip guide

    A symmetrical collar is what lets it pass a guide and load evenly. · step 04

If you saw this
  • The connection looks like a simple loop-through-loop with one crossing

    Check

    • ?Count the turns in the collar — you should see five

    Then

    • Rebuild with five passes; a girth hitch concentrates load on one crossing
  • The turns sit on top of each other rather than side by side

    Check

    • ?Look along the collar for a turn riding over its neighbour

    Then

    • Slack it off and re-cinch slowly
    • Retie if the turns will not nest
  • The main line enters the connection as a single strand

    Check

    • ?Trace the main line back — two strands should run into the collar

    Then

    • Build a Bimini first; the paw is only as good as the double under it
  • Fewer than five passes — a girth hitch

    Check

    • ?Load lands on one crossing and saws the loop apart
    • ?Inspect step 02

    Then

    • Retie. Do not dress a defective structure and call it seated.
  • Turns riding over each other instead of nesting

    Check

    • ?The advantage of spreading the load is lost
    • ?Inspect step 03

    Then

    • Retie. Do not dress a defective structure and call it seated.
  • Built on a single strand rather than a double

    Check

    • ?The connection is limited by one strand of main line
    • ?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 fixed loop is a standing eye. The collar or figure-eight body must survive a straight pull without becoming a noose.
  • ·Bowline and sheet bend are the same crossing pattern under different load. That identity is seamanship, not a reason for Decide to swap one for the other.

What topology does not predict

  • ·Fixed vs slipped is a load-path question. Invariants do not choose bowline over figure-eight.
  • ·Ring-loading and slack-shaking failure are physical. Topology does not grade them.
  • ·No UIAA or manufacturer number is inferred here.

Not for

  • ·A lure that must swing on a non-slip loop — this standing eye is a different job
  • ·Letting a climbing identity pick your fishing knot
  • ·Single-strand main line with no double built first
  • ·Light tackle where the doubled loop is bulkier than the job needs

Same pattern, different job

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

Sources