Difference between revisions of "AY Honors/Lashing/Answer Key"
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Synthetic ropes are all man-made from different types of plastics. They have unique names that reflect their different properties. The strength of the synthetic rope is at least twice that of Manila or Sisal rope. | Synthetic ropes are all man-made from different types of plastics. They have unique names that reflect their different properties. The strength of the synthetic rope is at least twice that of Manila or Sisal rope. | ||
The main types of synthetic ropes are: | The main types of synthetic ropes are: | ||
| − | ;Polypropylene and polyethylene: These are plastic ropes which stay afloat are not affected by water. They are designed for marine purposes; they are tough and have good abrasion resistance. However, they have low stretch and heat resistance. | + | ;Polypropylene and polyethylene: These are plastic ropes which stay afloat and are not affected by water. They are designed for marine purposes; they are tough and have good abrasion resistance. However, they have low stretch and heat resistance. |
;Terylene or polyester: These ropes stay afloat and are not affected by water. They have high heat resistance, but have low stretch. | ;Terylene or polyester: These ropes stay afloat and are not affected by water. They have high heat resistance, but have low stretch. | ||
;Nylon: These have a high level of strength, do not float and are affected by wet conditions. | ;Nylon: These have a high level of strength, do not float and are affected by wet conditions. | ||
Revision as of 21:32, 17 June 2018
1. Define lashing and explain its purposes.
2. How can lashing be used in a camping or outdoors setting? Give three examples.
3. What materials are used in lashing?
a. List types of ropes that are preferred for lashing.
b. Give the advantages of natural materials over dimensional lumber.
4. Demonstrate the following beginning and ending knots:
a. Timber hitch
b. Clove hitch
c. Square knot
5. What beginning and ending knots are used in the following five types of lashing:
a. Square
b. Shear
c. Tripod
d. Diagonal
e. Continuous
6. Explain how to calculate the length and thickness of ropes needed for a project. Demonstrate how to preserve the ends of a cut rope.
7. Explain the differences between a frap and a wrap.
- Wrap
- A wrap is a turn made around the two spars to hold the spars tightly together. Usually, three wraps are made to form a Square Lashing. Some other lashings require more wraps.
- Frap
- A frap is a turn made between the spars. It goes around the wraps to pull the wraps tighter. Usually two frapping turns are made on a lashing.
8. Demonstrate how to tie the following five lashings:
a. Square
b. Shear
c. Tripod
d. Diagonal
e. Continuous
9. Discuss what types of weight loading each diameter of rope can handle depending on the nature of the material.
Natural Ropes
- Manila
- Made from the leaves of the Musa textillis tree in the Philippine Islands.
- Sisal
- Made from the leaves of the Agave sisalaua plant that is native to central America. Sisal and Manila are the strongest natural material ropes with a 10% stretch factor.
- Hemp
- Made from an annual herbaceous plant native to west and central Asia. Hemp is 2/3 as strong as Manila and Sisal rope.
- Cotton
- Made from the white, downy, fibrous substance that covers the seeds of the cotton plant.
- Coir
- Made from coconut husks.
Synthetic Ropes
Synthetic ropes are all man-made from different types of plastics. They have unique names that reflect their different properties. The strength of the synthetic rope is at least twice that of Manila or Sisal rope. The main types of synthetic ropes are:
- Polypropylene and polyethylene
- These are plastic ropes which stay afloat and are not affected by water. They are designed for marine purposes; they are tough and have good abrasion resistance. However, they have low stretch and heat resistance.
- Terylene or polyester
- These ropes stay afloat and are not affected by water. They have high heat resistance, but have low stretch.
- Nylon
- These have a high level of strength, do not float and are affected by wet conditions.
They have good stretch and moderate heat resistance. Nylon 6 is used in rock climbing and nylon 66 is used in abseiling. Nylon is resistant to abrasions, bacteria and most organic solvents. It is sensitive to strong acids, alkalinity and long exposure to sunlight.
10. Demonstrate ways to store ropes and wood for later use.
Rope should be Coiled up and hung up in a dry place, or put in a box or bucket. The box or bucket should have holes to let the rope breathe. This will help against rot and odors.
The wood should be bundled up and racked off the ground in a dry place, like on a wall or hung from the ceiling. If outside, the wood should be wrapped in a tarp or oiled canvas to keep out water.
