Presentation is loading. Please wait.

Presentation is loading. Please wait.

1 Seamanship Chapter 8 Marlinspike. 2 Learning Objectives Learn the art and science of working with rope and line Learn the art and science of working.

Similar presentations


Presentation on theme: "1 Seamanship Chapter 8 Marlinspike. 2 Learning Objectives Learn the art and science of working with rope and line Learn the art and science of working."— Presentation transcript:

1 1 Seamanship Chapter 8 Marlinspike

2 2 Learning Objectives Learn the art and science of working with rope and line Learn the art and science of working with rope and line Understand knots, bends, hitches and splices Understand knots, bends, hitches and splices also the selection and use of line and also the selection and use of line and the proper care of line the proper care of line

3 3 Definitions Marlinespike Marlinespike A pointed tool used in splicing to open the strands of rope or cable A pointed tool used in splicing to open the strands of rope or cable Marlinespike Seamanship Marlinespike Seamanship General knowledge of knots, bends, hitches, splices, and care of rope General knowledge of knots, bends, hitches, splices, and care of rope

4 4 Definitions Rope Rope Cordage made of natural or synthetic fibers, also can be made of steel wire Cordage made of natural or synthetic fibers, also can be made of steel wire Line Line Name given rope aboard a boat Name given rope aboard a boat Each line is given a specific name, such as: Each line is given a specific name, such as: anchor line, anchor line, halyard, main sheet, spring line or dock line halyard, main sheet, spring line or dock line A few are still called rope, as in bell rope A few are still called rope, as in bell rope

5 5 Rope Strengths Safe load is 20% of breaking strength Safe load is 20% of breaking strength Dacron ® is the trade name for polyester fiber Dacron ® is the trade name for polyester fiber

6 6 Effect of Knots Lines are weakened by: Lines are weakened by: Knots – typically to 50-60% Knots – typically to 50-60% Splices – least reduction to 90% Splices – least reduction to 90%

7 7 Definitions Working Part Working Part Section of line used in forming a knot Section of line used in forming a knot Standing Part Standing Part The part of a line that is: The part of a line that is: made fast made fast not used in forming a knot not used in forming a knot around which the knot may be tied around which the knot may be tied In use, normally under strain In use, normally under strain

8 8 Definitions Bitter End Bitter End Inboard end of a line, chain or cable Inboard end of a line, chain or cable The end made fast to the boat The end made fast to the boat Working End Working End Attached to an anchor or cleat, etc. Attached to an anchor or cleat, etc.

9 9 Parts of a Line Bitter end Working part 

10 10 Bight Bight Standing part Standing part Free end Free end Turn Turn Round turn Round turn Round Turn Turn Free End More Definitions Bight Standing Part

11 11 Bight Line turned back against itself 

12 12 Overhand Loop Bitter end looped over the working part Bitter End Working Part 

13 13 Underhand Loop Bitter end looped under the working part Bitter End Working Part 

14 14 Turn Line looped around object, but not full turn 

15 15 Round Turn Line looped around object one and a half full turns 

16 16 Braided Braided Diamond braid over a core Diamond braid over a core Easy on hands Easy on hands High strength High strength Slippery Slippery Common laid rope Common laid rope 3 strands twisted 3 strands twisted Tends to kink Tends to kink Stretches more Stretches more Hard on hands Hard on hands Inexpensive Inexpensive Choosing A Line

17 17 Nylon Nylon Strongest and most elastic Strongest and most elastic Elasticity absorbs shock Elasticity absorbs shock Good for anchoring and mooring Good for anchoring and mooring Polyester (Dacron®) Polyester (Dacron®) Minimum of stretch Minimum of stretch Good for running rigging aboard sailboats Good for running rigging aboard sailboats Polypropylene Polypropylene Not as strong as nylon or Dacron Not as strong as nylon or Dacron Subject to abrasion, chafe & deterioration from sunlight Subject to abrasion, chafe & deterioration from sunlight Good point - it floats Good point - it floats Material

18 18 3-Strand Laid Line 

19 19 Laid Line Details 

20 20 Double Braid 

21 21 Parallel Core 

22 22 Caring for Lines Overloading Overloading Avoid kinks & sharp bends Avoid kinks & sharp bends Avoid chemicals Avoid chemicals Protect against chafing Protect against chafing Regular cleaning Regular cleaning

23 23 Stow carefully Stow carefully Coiling Coiling Flemishing Flemishing Caring for Lines

24 24 Whipping Whipping Used to keep the end of a line from unraveling Used to keep the end of a line from unraveling Methods Methods With ‘small stuff’ or twine With ‘small stuff’ or twine Taping Taping Liquid whip Liquid whip Melting nylon line ends Melting nylon line ends Common Whipping

25 25 Chafing Gear Protects line from chafing on chocks and hawse pipes Protects line from chafing on chocks and hawse pipes Commercially available Commercially available Home made using old Water hose Home made using old Water hose

26 26 Classes of Knots Hitches Hitches secure a line to an object secure a line to an object Bends Bends attach two lines together attach two lines together Knots Knots install a loop or a stopper in a line install a loop or a stopper in a line 

27 27 1.Start by lacing line over your hand 2.Form generous loops until line is coiled 3.Make two turns around coil 4.Feed working end through coil Coiling a Line

28 28 Basic Knots or Bends  A good knot is easy to tie and easy to untie A good knot is easy to tie and easy to untie Knots or bends weaken line by as much as 50% Knots or bends weaken line by as much as 50%

29 29 Figure 8 

30 30 Start by forming an underhand loop Start by forming an underhand loop Lead the free end under the standing part Lead the free end under the standing part Feed the free end through the loop formed by the underhand loop Feed the free end through the loop formed by the underhand loop Pull the knot tight Pull the knot tight Figure Eight

31 31 Figure-8 Construction 

32 32 Bowline 

33 33 Form overhand loop Form overhand loop Feed free end: Feed free end: through loop through loop around standing part around standing part into loop into loop Bowline

34 34 Bowline Construction 

35 35 Sheet Bend 

36 36 Use to join two lines of different diameter Use to join two lines of different diameter Form a bight in one line Form a bight in one line Lead free end of second line through bight and around Standing part of first line Lead free end of second line through bight and around Standing part of first line Tuck free end of second line under standing part of line two Tuck free end of second line under standing part of line two Snug up the bend Snug up the bend Sheet Bend

37 37 Sheet Bend Construction 

38 38 Clove Hitch 

39 39 Form an underhand loop around post Form an underhand loop around post Lead free end above the turn Lead free end above the turn Now form another underhand loop around post Now form another underhand loop around post Use a half hitch as a “locking knot” to keep the clove hitch from slipping Use a half hitch as a “locking knot” to keep the clove hitch from slipping Clove Hitch

40 40 Clove Hitch Construction 

41 41 Cleat Hitch 

42 42 Take 3/4 turn under horn away from the load Take 3/4 turn under horn away from the load Lead free end over and under opposite horn Lead free end over and under opposite horn Lead free end over and under other horn Lead free end over and under other horn Tuck free end under last turn Tuck free end under last turn Cleat Hitch

43 43 Cleat Hitch Construction 

44 44 Make a round turn around post or ring Make a round turn around post or ring Lead free end around standing part forming an underhand loop Lead free end around standing part forming an underhand loop Repeat the last step Repeat the last step Round Turn & Two Half Hitches

45 45 Take round turn around anchor ring or post Take round turn around anchor ring or post Make turn around the standing part Make turn around the standing part Feed free end through center of round turn Feed free end through center of round turn Make round turn around standing part and snug up the bend Make round turn around standing part and snug up the bend Anchor Bend

46 46 Good Uses Good Uses Furling sails Furling sails Reefing sails Reefing sails Lashing small stuff Lashing small stuff Should not be used for a varying load Should not be used for a varying load Reef or Square Knot

47 47 Tosser Tosser Splits line coil in half Splits line coil in half Tosses one coil underhand to the receiver Tosses one coil underhand to the receiver Receiver Receiver Holds arm out as target Holds arm out as target Lets line fall over out-stretched arm Lets line fall over out-stretched arm Heaving a Line

48 48 Winch Start by wrapping line clockwise Start by wrapping line clockwise Pile wraps up from bottom to top Pile wraps up from bottom to top Make more turns for a heaver load Make more turns for a heaver load The correct way to wrap a line around a winch. This will not jam.

49 49 Winch This is the incorrect way to lead a line to a winch. This will jam.

50 50 Blocks and Tackle Block Block A nautical name for a pulley A nautical name for a pulley Sheave Sheave Roller in a block over which line passes as it goes through block Roller in a block over which line passes as it goes through block

51 51 Blocks and Tackle Tackle Tackle Arrangement of line and blocks used to provide increased mechanical advantage Arrangement of line and blocks used to provide increased mechanical advantage Winch Winch Geared drum turned by a handle and used to pull lines such as sheets and halyards Geared drum turned by a handle and used to pull lines such as sheets and halyards

52 52 Blocks and Tackles 1:12:13:14:1 5:1 ABC D E

53 53 Seamanship


Download ppt "1 Seamanship Chapter 8 Marlinspike. 2 Learning Objectives Learn the art and science of working with rope and line Learn the art and science of working."

Similar presentations


Ads by Google