knot tying in rigging applications n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Knot Tying in Rigging Applications PowerPoint Presentation
Download Presentation
Knot Tying in Rigging Applications

Loading in 2 Seconds...

play fullscreen
1 / 25

Knot Tying in Rigging Applications - PowerPoint PPT Presentation


  • 130 Views
  • Uploaded on

Knot Tying in Rigging Applications. Presented by: Christopher G. Lombard ACED 4680. Overview. Throughout history, ever since humankind invented rope, skill in tying knots and the development of rope has played a vital role in early technological advancements and the building of civilizations.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Knot Tying in Rigging Applications' - tybalt


Download Now An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
knot tying in rigging applications

Knot Tying in Rigging Applications

Presented by: Christopher G. Lombard

ACED 4680

overview
Overview
  • Throughout history, ever since humankind invented rope, skill in tying knots and the development of rope has played a vital role in early technological advancements and the building of civilizations.
  • Although it is still unclear when the first rope was made, evidence suggests that it was during prehistoric times.
  • This is due to the fact that the first rope was made of natural fibers that decomposed and did not survive the ages.
  • The first ‘ropes’ were formed from naturally occurring plant stems, such as lengths of vine.
overview1
Overview
  • In order for rope to be useful, our early ancestors had to develop some level of skill in tying knots.
  • Fragments of rope have been discovered and dated back to approximately 15,000 BC.
  • The early Egyptians were the first civilization to develop tools designed for rope manufacture and, thusly, have been credited with first mastering large-scale rope production.
  • Such ancient and rudimentary skills have seldom transcended the ages, however knot tying is one that remains pertinent to this day…
knowledge and learning objectives
Knowledge and learning objectives
  • Upon successful completion of this topic the student will be able to:
  • Recall at least three of the four methods of preventing a rope from unlaying, as presented in the instructional materials.
  • Recite the meanings and definitions of at least eight of the twelve terms presented in the instructional materials.
  • Visually identify the five knots commonly utilized in rigging applications, as presented during instruction, with no errors.
knowledge and learning objectives1
Knowledge and learning objectives
  • Recall seven of the ten basic categories and different types of fiber used to manufacture rope as presented in the instruction and course materials.
  • As presented in the course materials and instruction, name the two primary types of rope with no errors.
  • Demonstrate ability to tie a bowline in the same manner as illustrated and performed during the course of instruction with no errors.
  • Demonstrate ability to tie a square knot in the same manner as illustrated and performed during the course of instruction with no errors.
knowledge and learning objectives2
Knowledge and learning objectives
  • Demonstrate ability to tie a figure eight knot in the same manner as illustrated and performed during the course of instruction with no errors.
  • As illustrated and performed during the course of instruction, demonstrate ability to tie a clove hitch sufficient to prevent untying of the knot when a pull is applied to the line with no errors.
  • Demonstrate the ability to ascertain and tie the safest knot under a specified application to assure that a load will be held most securely with no errors.
  • Recall the proper technique for backing a knot to prevent its loosening or unraveling with no errors.
terminology
Terminology
  • In order to understand some uncommon and trade specific terms, we must review them:
  • Back – to reinforce a knot, bend, or hitch with another.
  • Bight – a pinch point or loop in a rope.
  • Bitter end – the end of a rope.
  • Coefficient of friction - a ratio between the force required to move one surface over another and the pressure exerted between them.
  • Efficiency rating – the efficiency of a knot, expressed as a percentage, as it relates to breaking strength.
terminology1
Terminology
  • Filament– fiber or a slender threadlike object.
  • Frap – to bind something tightly.
  • Fray – to become worn at the end or edges or unravel into separate filaments.
  • Knot - intertwined loops of rope used to fasten one to another or to some other object.
  • Strand – several filaments or fibers that are twisted, woven, or bundled together.
  • Tail – a short portion of a rope adjacent to the bitter end.
  • Unlay – untwist into the separate strands.
categories of rope
Categories of rope
  • Categories of rope:
    • Natural fiber
      • Examples are rope produced from jute, sisal, hemp, manila, and cotton.
    • Synthetic fiber
      • Examples are nylon, polypropylene, and polyester.
types of rope
Types of rope
  • Types of rope used in rigging applications:
    • Three strand – rope consisting of three intertwined strands.
    • Double braid – rope constructed of multiple strands woven together.
rope characteristics
rope characteristics
  • With regards to knot tying and rigging, there are important advantages, disadvantages, and differences between rope types that must be considered:
  • Breaking strength (synthetics have edge)
  • Suppleness/pliability (nylon, polyester, and cotton best)
  • Coefficient of friction (natural slightly better)
  • Durability (fairly even)
  • As you can see, there is a fairly even split between natural and synthetic. Selection is dependent upon application and desirable characteristics.
preventing unlaying
preventing unlaying
  • Methods of preventing a bitter end from unlaying:
  • Taping or shrink wrapping (natural and synthetics)
  • Heat treating (synthetics)
  • Frapping or binding (primarily used on natural rope)
  • Tying a knot
tying with a rope
Tying with a rope
  • There are three basic ways to tie or bind using a rope:
  • Knot - intertwined loops of rope used to fasten one to another or to some other object.
  • Bend – an intertwining of two rope ends.
  • Hitch – attaching a rope to a post, ring, or other, usually round, object.
  • Efficiency ratings of knots, bends, and hitches generally fall between 50 – 75%.
primary rigging knots
primary rigging Knots
  • There is a combination of five knots and hitches that are used most often in rigging applications:
  • Bowline (knot)
  • Square knot
  • Clove hitch
  • Half hitch
  • Figure eight (knot)
bowline
BOWLINe

Purpose/application: whenever a loop is required

Advantages: will not bind/cinch under strain, unties easily

Efficiency: 50%

square knot
Square knot

Purpose/application: attaching the ends of ropes together

Advantages: quick to tie once proficient, not prone to loosening

Efficiency: 50%

clove hitch
CLOVE HITCH

Purpose/application: attaching a rope to poles, rings or other round objects

Advantages: self cinching, easily tied/untied, high efficiency

Efficiency: 75%

half hitch
half HITCH

Purpose/application: used to hold a line, keep long objects upright, back up other knots/bends/hitches

Advantages: very easily tied/untied, self cinching, high efficiency rating

Efficiency: 70%

The Half Hitch

figure eight
Figure Eight

Purpose/application: used to tie down/secure objects, prevent rope from unlaying

Advantages: easily tied, self cinching under strain

Efficiency: 50%

summary
SUMMARY

Categories of rope (2):

Natural

Synthetic

Types of rope (2):

Three strand

Double braid

Important rope properties/characteristics (4):

Breaking strength

Suppleness/pliability

Coefficient of friction

Durability

summary1
SUMMARY
  • Basic ways to tie or bind using a rope (3):
  • Knot - intertwined loops of rope used to fasten one to another or to some other object.
  • Bend – an intertwining of the ends of two different ropes.
  • Hitch – attaching a rope to a post, ring, or other, usually round, object.
  • Methods to prevent unlaying (4):
  • Taping or shrink wrapping (natural and synthetics)
  • Heat treating (synthetics)
  • Frapping or binding (primarily used on natural rope)
  • Tying a knot
review
Review

Associate the knots pictured with their names:

Square knot

Bowline

Half hitch

Figure eight

Clove hitch

A

B

C

E

D

resources references
RESOURCES/REFERENCES
  • http://listverse.com/2007/10/07/top-10-ancient-inventions/
  • http://www.igkt.net/beginners/what.php
  • http://www.2020site.org/knots/
  • http://www.animatedknots.com/indexbasics.php?Categ=basics&LogoImage=LogoGrog.jpg&Website=www.animatedknots.com
  • All Images sourced from Google Images.
conclusion
conclusion

Questions?