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ABL-8 AbleAnchoring Instructors: George Crowl
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Course Outline (1) a. Describe the various kinds of anchor rode and the advantages and disadvantages of each type. b. Identify the parts of the anchor cable starting with the anchor and ending at the vessel. c. Describe the methods of marking chain and demonstrate that you know the chain markings on your ship vessel.
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Course Outline (2) d. While on a cruise assist in the construction of an anchor watch schedule and stand one watch. e. Identify a capstan or windlass and explain its use in handling line, wire rope, or chain.
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ABL-8a Describe the various kinds of anchor rode and the advantages and disadvantages of each type
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Chain Anchor Rode Chain for large vessels Strength Some shock absorbancy as chain is lifted from the seabed Chain at the anchor for smaller vessels Weight keeps anchor on the ground Chain resists abrasion on rocks, etc. Connects to rope rode
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Nylon Anchor Rode Nylon is stretchy – 10%, easing the force of waves striking the vessel Nylon is much lighter than chain Nylon is much more subject to abrasion from rocks, sand and mud Can be used for small boats, or a lunch hook
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Manila Anchor Rode Primary rope rode until synthetic materials Has more stretch than many materials Subject to rot if put away wet Seldom used anymore for serious use
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ABL-8b Identify the parts of the anchor cable starting with the anchor and ending at the vessel.
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Anchor Rig Anchor itself, any kind Ring Shackle Chain – much longer than depicted Shackle Thimble, eye splice, safety wire and seizings Rode
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Anchor Chain Swivel Some prefer to have a swivel in the chain Allows rotation of chain and line when needed Often galvanized steel, like the chain
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Rode Chain OR Nylon
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Vessel End Hawse hole / hawse pipe Windlass Bow chock Cleat for line Capstan
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ABL-8c Describe the methods of marking chain and demonstrate that you know the chain markings on your ship vessel.
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Chain Marking Standard Navy chain marking
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Marking Anchor Line There is no standard system Make your own up that you and others can understand Tell what your Sea Scout ship uses
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ABL-8d While on a cruise assist in the construction of an anchor watch schedule and stand one watch.
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Considerations What is the purpose of an anchor watch? How long do we need an anchor watch for? How many people do we have to stand the anchor watch? How long can a person stay alert during an anchor watch? How can we minimize disruption of sleep and other duties?
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Sample Anchor Watch Schedule 2000-2200 Sam 2200-2400 Janet 2400-0200 Jack 0200-0400 Jill 0400-0600 Mergitrude
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Anchor Watch Duties Watch GPS or take bearings to insure vessel is not dragging anchor Insure vessel will not interfere with other vessels Check anchor light and / or ball Monitor Channel 16 Call the Skipper for unusual circumstances
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ABL-8e Identify a capstan or windlass and explain its use in handling line, wire rope, or chain.
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Capstan Stands vertically Most sailboats take three line wraps and tail the line to be coiled later Old-time sailboats used it to raise the anchor
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Windlass Barrel is horizontal Many main and jib halyards use windlasses Windlass best known for raising anchor chain or rode. Note the slots for chain on both.
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Winch Common sailboat term for both capstans and windlasses that allow tightening halyards and sheets, allowing the line to run off the winch. Term also used for winding up rope onto a spool, such as the winch used to pull and secure a small boat on a trailer.
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All Three Devices Provide extra force and friction to pull in line or chain Can be powered by hand crank, electric motor, pneumatic (air), and hydraulic motor Electric is good for Sea Scout size boats Hydraulic is better for large vessels
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Questions?
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