FVSPS Sail Course, Class 4

What Are We Doing Today?

In Class Today:

- 10:00 OTW Today Briefing (Brian)

- 10:10 Last Week’s OTW, Discuss (Brian)- 10:20 Questions/Clarification, Sec. 3-5 (Leslie)- 10:50 Section 12, “Tuning the Rig”(Brian)- 11:00 Section 7, “Stability” (Brian)- 11:20 Section 8, “Balance” (Leslie)- 11:40 True vs. Apparent Wind – Implications (Brian)- 11:55 OTW Assignment (Brian)- 12:00 Lunch, then OTW

Yacht Club Bar Song, ChorusI love to sit around the yacht club bar

and talk about the things we’re going to do.

I love to sit around the yacht club bar

because it doesn’t move.

The swells are big and the winds are high

but that don’t bother me.

Cause I never get lost and my tummy doesn’t toss

It’s a wonderful life on the sea.

Yacht Club Bar Song, Verse 4

My sailing days are over, cause of that great scare.

You others take a warning, and don’t you go out there.

There’s winds and seas and swells so high, how can you stay afloat.

Be like me and drink to the sea and don’t untie your boat.

Yacht Club Bar Song, ChorusI love to sit around the yacht club bar

and talk about the things we’re going to do.

I love to sit around the yacht club bar

because it doesn’t move.

The swells are big and the winds are high

but that don’t bother me.

Cause I never get lost and my tummy doesn’t toss

It’s a wonderful life on the sea.

OTW TodayBriefing

Prior OTW, Discuss

1. What did you learn?

2. What went right?

3. What went wrong?

Questions/ClarificationsSections 3-5

FVSPS Sail CourseSail Book, Section 12

Tuning the Rig

(Section 12, Sail book)

Rig Tuning, Overview

- Brion Toss quote, Rigger’s Apprentice, p. 272

- Rigging Issues:- Maintenance, Strength – Inspection/Tuning

- Performance – Tuning

Turnbuckle,Chainplate

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

Rig Tuning, Procedures

- Mast centered athwart ship

- Mast vertical

- Stays appropriately tensioned

- Check under sail

Rig Tuning,Performance Implications

- Mast bend- Flatten mainsail vs. add draft

- Mast tilt- Weather helm

FVSPS Sail CourseSail Book, Section 7

Stability

(Section 7, Sail book)

Stability

- Will the boat, when heeling, come back up?

- True or not: “Sailboats are made to heel?”- Compare Sailing dinghy vs. Keel Boat

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

Form Stability

- How related to beam of the boat?

- How related to “sea kindliness”?

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.

Ultimate Stability

- How related to beam of the boat?

- How related to ballast?

- How related to offshore safety?

Stability: Final Comments

- Compare Monohulls and Catamarans on Initial and Ultimate Stability.

FVSPS Sail CourseSail Book, Section 8

Balance

(Section 8, Sail book)

Balance

- What is Balance?

- What affects Balance?

- Center of Effort

- Center of Lateral Resistance- Sail Book, pp. 63-64

Balance Issues

- Dynamic Centers of Effort

- Yawing Moment

- Changes to make for Balance- Sail Book, pp. 64-66

True vs. Apparent Wind

- True Wind, Boat Wind vs. Apparent Wind

- Simple Examples: TW and BW parallel

True vs. Apparent Wind

- Not parallel: Analyze with Trigonometry, Diagrams

- Sail Book, pp. 74-75

True vs. Apparent Wind:Some 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)

OTW Assignmentfor Today