FVSPS Sail Course, Class 4

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FVSPS Sail Course, Class 4
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What Are We Doing Today?

• In Class Today
• - 1000 OTW Today Briefing (Brian)
• - 1010 Last Weeks OTW, Discuss (Brian)
• - 1020 Questions/Clarification, Sec. 3-5
  (Leslie)
• - 1050 Section 12, Tuning the Rig(Brian)
• - 1100 Section 7, Stability (Brian)
• - 1120 Section 8, Balance (Leslie)
• - 1140 True vs. Apparent Wind Implications
  (Brian)
• - 1155 OTW Assignment (Brian)
• - 1200 Lunch, then OTW

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Yacht Club Bar Song, Chorus

• I love to sit around the yacht club bar
• and talk about the things were going to do.
• I love to sit around the yacht club bar
• because it doesnt move.
• The swells are big and the winds are high
• but that dont bother me.
• Cause I never get lost and my tummy doesnt toss
• Its a wonderful life on the sea.

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Yacht Club Bar Song, Verse 4

• My sailing days are over, cause of that great
  scare.
• You others take a warning, and dont you go out
  there.
• Theres winds and seas and swells so high, how
  can you stay afloat.
• Be like me and drink to the sea and dont untie
  your boat.

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Yacht Club Bar Song, Chorus

• I love to sit around the yacht club bar
• and talk about the things were going to do.
• I love to sit around the yacht club bar
• because it doesnt move.
• The swells are big and the winds are high
• but that dont bother me.
• Cause I never get lost and my tummy doesnt toss
• Its a wonderful life on the sea.

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OTW TodayBriefing
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Prior OTW, Discuss

• 1. What did you learn?
• 2. What went right?
• 3. What went wrong?

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Questions/ClarificationsSections 3-5
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FVSPS Sail CourseSail Book, Section 12
Tuning the Rig (Section 12, Sail book)
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Rig Tuning, Overview

• - Brion Toss quote, Riggers Apprentice, p. 272
• - Rigging Issues
• - Maintenance, Strength Inspection/Tuning
• - Performance Tuning

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Turnbuckle,Chainplate
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Rig Tuning, Tools

• - Diagnostic Tools
• - Sight up the mast
• - Measure wire tension with gauge
• - When heeled over under sail sight and check
  tension
• - Adjustment tools
• - Wrench
• - Your hand

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Rig Tuning, Procedures

• - Mast centered athwart ship
• - Mast vertical
• - Stays appropriately tensioned
• - Check under sail

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Rig Tuning,Performance Implications

• - Mast bend
• - Flatten mainsail vs. add draft
• - Mast tilt
• - Weather helm

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FVSPS Sail CourseSail Book, Section 7
Stability (Section 7, Sail book)
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Stability

• - Will the boat, when heeling, come back up?
• - True or not Sailboats are made to heel?
• - Compare Sailing dinghy vs. Keel Boat

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Stability Initial Stability

• - Initial or Form Stability
• - Form implies stability comes from the form of
  the boat, which has buoyancy that tries to right
  the boat
• - Can represent using Vectors in a Diagram
• - E.g. Sail book, p. 55

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Form Stability

• - How related to beam of the boat?
• - How related to sea kindliness?

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Stability Ultimate Stability

• - How far can the boat heel and still come back
  upright?
• - Limit of positive stability
• - LOPS for the Pacific Seacraft 34 144 deg.
• - LOPS for the Hunter 41, Catalina 27 125 deg.

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Ultimate Stability

• - How related to beam of the boat?
• - How related to ballast?
• - How related to offshore safety?

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Stability Final Comments

• - Compare Monohulls and Catamarans on Initial and
  Ultimate Stability.

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FVSPS Sail CourseSail Book, Section 8
Balance (Section 8, Sail book)
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Balance

• - What is Balance?
• - What affects Balance?
• - Center of Effort
• - Center of Lateral Resistance
• - Sail Book, pp. 63-64

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Balance Issues

• - Dynamic Centers of Effort
• - Yawing Moment
• - Changes to make for Balance
• - Sail Book, pp. 64-66

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True vs. Apparent Wind

• - True Wind, Boat Wind vs. Apparent Wind
• - Simple Examples TW and BW parallel

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True vs. Apparent Wind

• - Not parallel Analyze with Trigonometry,
  Diagrams
• - Sail Book, pp. 74-75

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True vs. Apparent WindSome Implications

• - Why When We Tack we Tack Further than we Expect
  (Fig. 9-8, p. 74)
• - Why a Beam Reach takes us Downwind (Fig.
  9-9/10, p. 75)

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OTW Assignmentfor Today