Anchors ropes and knots
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Anchors Ropes and Knots. We will cover. Anchor Types Anchoring Procedure Anchoring Rope Types, Composition and Strength Shot Lines Lazy Lines Knot Types and Uses. Types of Anchor CQR (Coastal Quick Release). Recommended - seaweed and grass but is heavy

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Anchors Ropes and Knots

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Anchors Ropes and Knots


We will cover

  • Anchor Types

  • Anchoring Procedure

  • Anchoring

  • Rope Types, Composition and Strength

  • Shot Lines

  • Lazy Lines

  • Knot Types and Uses


Types of AnchorCQR (Coastal Quick Release)

  • Recommended- seaweed and grass but is heavy

  • Not recommended - hard sand, rocky seabed


Types of AnchorDanforth (Fluke Anchor)

  • Recommended- burying anchor, soft sand and mud

  • Not recommended – seaweed, hard sand, rocky seabed


Types of AnchorGrappling or Folding

  • Recommended- hard sand, rocky seabed

  • Not recommended – soft sand, clay and mud


Types of AnchorAdmiralty pattern

  • Recommended- rocky seabed, kelp and grass

  • Not recommended – soft sand, clay and mud


Types of AnchorBruce (Claw)

  • Recommended- rocky seabed, kelp and grass

  • Not recommended – seaweed and grass


Anchoring Procedure

  • Ready Anchor

  • Head into wind - tide - swell

  • Put engine in neutral

  • Deploy Anchor

  • Allow boat to drift back

  • On reaching bottom pay out more rope to decrease angle of shaft


Anchoring Procedure

  • 3-4 times the depth gives stable holding.

  • Upon resistance - give tug to dig anchor in

  • Check for drift

  • Secure anchor line to boat

  • Buoy anchor line

  • Stop engine


Anchoring


Hauling Anchor(Weighing)

  • Start engine - leave in neutral

  • Untie line from yoke

  • Haul on rope till resistance gives

  • When line goes tight give sharp pull to dislodge anchor

  • If stuck - motor boat around and try again.

  • When anchor is recovered - stow away neatly


Sea-Anchor

Direction of drift

Sea-Anchor Dimensions

Large End is 1" for every

1' of boat length

Line is 3 times boat length

Tripping line

Dramatically

Slows Down Drift

Gives Stability


Rope Types

  • Natural

    • Manila

    • Sisal

    • Hemp

  • Man-Made

    • Nylon

    • Polyester

    • Polypropylene

  • Wire or Spun Steel


Rope Composition

  • Spun or Hawser Laid

  • Braided


Rope Strength

  • Strength is based on theSafe Working Load (SWL) of the rope

  • Points of note:

    • Knots reduce strength by 50%

    • Splicing reduces strength by 12%

    • Natural rope loses 50% of its strength when SATURATED


Handling Rope

  • Keep rope tidy and tangle free

  • Stow away carefully(Coiled properly and ready for instant use)


Shot Lines

Used for marking area of special interest e.g. Wreck or Test Area

Large Buoy (50 Litres)

Keep Straight

As Possible

Heavy Weight

25 Kgs +


Lazy Lines

Usually dropped over

side of boat marking

decompression stops

3m

6m

9m


KnotsBasic Terms for Knot Forming

Standing Part

Bitter End

Bight


KnotsClove Hitch

  • Use – For quickly securing a line


KnotsRound Turn and Two Half Hitches

Half hitch

  • Use - Also for securing a line

    • Advantage that it can be undone under strain


KnotsReef Knot

  • Use - For joining ropes together of equal thickness

  • Can open if strain is released


KnotsSheet Bend

  • Use - For joining ropes together of unequal thickness

  • More secure than a Reef Knot.


KnotsBowline

  • Uses - Best for security and Life Lines

  • Forms non slip loop

  • Easily opened

  • The Rescue Knot


KnotsFisherman’s Bend

  • Uses - Permanent knot

  • Ideal for anchors


KnotsFigure of Eight

  • Use - Self jamming knot, used as end stopper


KnotsHighwayman’s Cutaway

  • Use - A very secure "quick release" knot


Summary

  • Anchor Types

  • Anchoring Procedure

  • Anchoring

  • Rope Types, Composition and Strength

  • Shot Lines

  • Lazy Lines

  • Knot Types and Uses


Questions?


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