Chapter 3 Flashcards

Knots

1
Q

How/Why are knots used?

A

To fasten a rope around an object or to join rope ends together.

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2
Q

How are all knots and hitches tied?

A

By a combination of bights, loops, and round turns

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3
Q

What are the terms used in tying knots?

A
  • The Standing Part is the longest part of a rope.
  • The Running End of a rope is the free end used to tie a knot.
  • The Bight is a loop formed by placing the running end of the rope parallel to the standing part of the rope.
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4
Q

What is the weakest point of a rope?

A

A Knot or Splice

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5
Q

How does a knot work?

A

When strain is applied the knot begins to sever the strands of the rope.

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6
Q

How is knot efficiency determined?

A

-By repeatedly breaking a rope with a tied knot in it and averaging the weights at which it broke.

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7
Q

Properties of the Bowline?

A
  • “King of Knots”
  • 65% Efficient
  • Easily untied after supporting heavy strain
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8
Q

Properties of the Running Bowline?

A
  • 50% Efficient
  • Used for securing a rope to the top of a pole for a temporary guy
  • Tagging a Suspended Load
  • Bowline tied around the standing part of the rope.
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9
Q

Properties of Bowline on the Bight?

A
  • 65% Efficient
  • Used when a temporary eye is needed and the rope is longer than desired
  • Used to pull a stuck vehicle with another vehicle
  • Easily untied even if placed under heavy strain
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10
Q

Properties of Clove Hitch?

A
  • 60% Efficient
  • Used to fasten a rope around an object
  • Composed of two opposing half hitches
  • Binds on the object with greater force as strain increases
  • Easy to remove when strain is released
  • Most reliable when attached to round objects, conductor or pipe
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11
Q

Properties of Square Knot?

A
  • 60% Efficient
  • Used for securing a rope or line around an object
  • Easily tied and untied
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12
Q

What are the variations of the Square Knot?

A
  • Thief Knot - Intentional Knot
  • Granny Knot - Mistaken attempt of the Square Knot “Hatchet Knot”
  • Grief Knot - “WhatKnot,” Trick knot
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13
Q

Properties of Sheet Bend?

A
  • Especially useful for joining different sizes of rope temporarily
  • To be tied properly, the tails of both ropes must be on the same side of the knot
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14
Q

Properties of Slip Knot?

A
  • Used for hoisting tools or materials to the top of the pole or structure.
  • Can be difficult to untie if used on heavy loads
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15
Q

Properties of Grunt Knot?

A
  • Used to tie items on a handline when a hook is not available
  • Untied by pulling on the fall line
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16
Q

Properties of Snubbing Knot?

A
  • 50%
  • Especially effective for controlling tension when untying
  • Used to secure conductor to the pole
  • The Snubbing Knot can be untied under full control while the weight of the conductor transfers to the hoist