® 1 seamanship chapter 6 anchoring, mooring and rafting
TRANSCRIPT
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SeamanshipSeamanship
Chapter 6Chapter 6
Anchoring, Mooring Anchoring, Mooring and Raftingand Rafting
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Learning ObjectivesLearning Objectives
This session is intended to This session is intended to acquaint you with:acquaint you with: anchor types and equipmentanchor types and equipment anchoring techniques anchoring techniques locations for effective anchoring locations for effective anchoring mooring and rafting mooring and rafting
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AnchoringAnchoring The skill of The skill of
securing the securing the vessel to the vessel to the bottombottom
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AnchorsAnchors
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Bottom ConditionsBottom Conditions
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What do you need?What do you need?
Many boaters carry Many boaters carry several anchors of several anchors of different sizes and typesdifferent sizes and types
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Fluke Type Fluke Type AnchorsAnchors
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Claw Type AnchorsClaw Type Anchors
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Plow Type AnchorsPlow Type Anchors
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Mushroom Anchors
Mooring Mooring
Dinghyanchor
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GrapnelGrapnel
closed
open
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Anchor StorageAnchor Storage
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Anchor RodeAnchor Rode
Rode is the entire length of anchor line or Rode is the entire length of anchor line or chain between the boat and the anchorchain between the boat and the anchor
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Nylon vs. ChainNylon vs. Chain
Nylon (et al)Nylon (et al) Less costlyLess costly Lighter in weightLighter in weight 20% or greater stretch20% or greater stretch Shock absorberShock absorber Easier to work withEasier to work with Heat stress failureHeat stress failure Wear and abrasionWear and abrasion Some UV damageSome UV damage
ChainChain ExpensiveExpensive Heavy and heavierHeavy and heavier RuggedRugged Resists wear and Resists wear and
abrasionabrasion Deep catenaryDeep catenary Holds bottomHolds bottom Does not stretchDoes not stretch Non-absorbingNon-absorbing May need a hoistMay need a hoist May bow down trim May bow down trim
the boatthe boat Corrosion potentialCorrosion potential Gloves Gloves
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Anchor ChainAnchor Chain Strength and weight Strength and weight
differencesdifferences
Link SizeLink Size Safe Working Load (lb)Safe Working Load (lb) Breaking Strength (lb)Breaking Strength (lb) Weight per 10 ft (lbs)Weight per 10 ft (lbs)
Proof CoilProof Coil
3/163/16 750750 30003000 3.93.9
¼¼ 12501250 50005000 6.36.3
5/165/16 19001900 76007600 1010
⅜⅜ 26502650 1060010600 1414
½½ 45004500 1800018000 2626
⅝⅝ 69006900 2760027600 3838
3/43/4 97509750 3900039000 5555
BBBBBB
5/165/16 19001900 76007600 1212
3/83/8 26502650 1100011000 1717
1/21/2 45004500 1800018000 3030
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Correct Anchor Size & WeightCorrect Anchor Size & Weight Check your manufacture’s recommendationsCheck your manufacture’s recommendations Under what conditions will the anchor be used?Under what conditions will the anchor be used? Storm anchors – increase the weight and size of rode.Storm anchors – increase the weight and size of rode.
Boat Boat LengthLength
ChainChain RopeRope Fluke TypeFluke Type Plow TypePlow Type Claw Claw TypeType
(ft)(ft) Size Size (in)(in)
Size Size (in)(in)
GalvanizedGalvanized High High tensiletensile
AluminumAluminum HingedHinged Non-Non-hingedhinged
Up to Up to 2525
¼¼ 3/83/8 8 lb8 lb 6 lb6 lb 4 lb4 lb 25 lb25 lb 9 lb9 lb 11 lb11 lb
25 - 25 - 36 36
¼¼ ½½ 15 lb15 lb 14 lb14 lb 7 lb7 lb 35 lb35 lb 14 lb14 lb 16.5 lb16.5 lb
28 - 28 - 4040
5/165/16 5/85/8 22 lb22 lb 25 lb25 lb 10 lb10 lb 35 lb35 lb 22 lb22 lb 22– 33 22– 33 lblb
35 - 35 - 4646
3/83/8 ¾¾ 43 lb43 lb 40 lb40 lb 15 lb15 lb 45 lb45 lb 35 lb35 lb 44 lb44 lb
45 - 45 - 7070
1/21/2 11 70 lb70 lb 21 lb21 lb 60 lb60 lb 66 lb66 lb
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How much Chain and Line?How much Chain and Line?
Typical anchor systemTypical anchor system Chain at anchorChain at anchor Line to boatLine to boat
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Scope – Line/ChainScope – Line/Chain
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ScopeScope
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ScopeScope
Line/Chain comboLine/Chain combo 7:1 7:1 nominalnominal 10:110:1 stormstorm 5:15:1 light conditionslight conditions
All ChainAll Chain 3:1 – 5:13:1 – 5:1
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Why Chain?Why Chain?
Prevents chafe on bottomPrevents chafe on bottom Hold anchor stock horizontalHold anchor stock horizontal Enhances catenaryEnhances catenary
How long?How long? 1/2 to full length of boat for combo1/2 to full length of boat for combo More is betterMore is better
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Catenary - LineCatenary - Line
Natural catenary – provides cushionNatural catenary – provides cushion Straightens under wind and wave conditionsStraightens under wind and wave conditions
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Catenary - ChainCatenary - Chain
Chain contours bottomChain contours bottom Peels from bottom under wind and wave conditionsPeels from bottom under wind and wave conditions
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Anchor SentinelAnchor Sentinel
Sentinel – weight deployed on anchor rodeSentinel – weight deployed on anchor rode Alters catenary to flatter positionAlters catenary to flatter position Sentinel suspended and held in place by line: Sentinel suspended and held in place by line:
“Preventer” (red)“Preventer” (red)
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SnubberSnubber
Snubber – section of line allowing chain to loopSnubber – section of line allowing chain to loop Serves as a “shock absorber”Serves as a “shock absorber”
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Anchor WindlassAnchor Windlass
Switch
Lock
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Shackle, Swivels, Thimble & Hook
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Chafing Gear
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Identifying Anchorages
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No Anchor Warnings
No AnchorAreasNo AnchorAreas
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Single Single AnchorAnchor
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Lowering the Anchor
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AnchoringAnchoring
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Confirming Hold
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Weighing & Retrieving Weighing & Retrieving AnchorAnchor
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Retrieving the AnchorRetrieving the Anchor
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Two AnchorsTwo Anchors
In tight quarters In tight quarters two anchors may two anchors may be required to be required to control swingcontrol swing
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Two Bow Anchors
30° to 45°
Scope 7 to 10:1
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Bahamian Mooring
In confined space two bow anchors can be usedIn confined space two bow anchors can be used
Plan for your swing room
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Overnight AnchoringOvernight Anchoring
Same basic consideration for any Same basic consideration for any anchoring situationanchoring situation
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Fouled Anchor
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Trip Line
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Mooring Approach
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Leaving a Mooring
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Raftup
Socialization on the waterSocialization on the water Boaters can safely move from boat Boaters can safely move from boat
to boatto boat Planning and permission requiredPlanning and permission required
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Fenders
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Side by Side Rafting
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Stern to Stern Rafting
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Rafting in a Circle
Good manners and courtesy are important during raftups.
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