FVSPS Sail Course, Class 4

Today’s OTW

•Weather Outlook•Boats Going Out•Sign-Up Sheet

What Are We DoingIn-Class Today?

- Prior OTW, Discuss

- Questions, Sec. 9-11

- Sail Book, Sec. 3-5

- OTW Assignment

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.

Prior OTW, Discuss

1. What did you learn?

2. What went right?

3. What went wrong?

Questions/ClarificationSail Sections 9, 10, 11

• Section 9

• Section 10

• Section 11

FVSPS Sail Course, Class 4

Sail Book, Section 3Boat Design & Hull Types

Nautical Architects Care About:

- What is Above Water (Section 2, “Sail Plans)

- What is Below Water (Section 3, “Boat Design and Hull Plans”)

Why Care About What is Below the Water?

Underbody Design Affects:

• Stability – Initial vs. Ultimate

• Leeway – Can we sail to windward?

• Tracking Stability vs. Turning Agility

• Speed – Drag from total wetted surface area

Continuum – Heavy Cruising Boats to Light Racing Boats

(Can help to roughly categorize boats on the heavy-light continuum.)

• Displacement to Length Ratio (D/LWL)

• Sail Area to Displacement Ratio (SA/D)

• Keel – Full Keel to high-aspect-ratio Fin Keel

• Rudder – Keel-Hung Rudder to Spade Rudder

Quantitative Measures to Assess Boat Design

(Some use for comparing boats, but limitations to the quantitative measures.)

• Displacement/LWL Ratio (D/LWL)

• SA/Displacement Ratio (SA/D)

• Ballast/Displacement Ratio (B/D)

• Limit of Positive Stability (LPS, in degrees)

• Lots of others – e.g. see SailCalc program

Functions of Keel

• Lower Center of Gravity– Increase Stability

• Reduce Leeway

Keel Types

•Full keel

•Full keel with cut away fore foot

•Fin keel with skeg rudder

•Fin keel with spade rudder

•Centerboard, Daggerboard, Leeboard

Different Underbody Shapes

Catamaran and Trimaran

Monohull vs. Multihull

• Form Stability vs. Ultimate Stability

• Displacemnt Hulls vs. Planning Hulls

• Heeling

• Interior Space

• Docking

Boat Design: Summary of Some Specific Points

• Fiberglass most common hull material

• Keels evolved from None to Full to Fin

• Wetted surface area determines water friction

• Waterline length determines hull speed

• Tracking Stability vs. Maneuverability

• Form Stability vs. Ultimate Stability

• Best Cruising Boat Design - ??????

FVSPS Sail Course, Class 4

Sail Book, Section 4Standing Rigging

Standing Rigging

• What is the purpose of Standing Rigging?

• Do all Sailboats have Standing Rigging?

Standing Rigging

What are the components of Standing Rigging?

- Headstay/Forestay/Jibstay

- Backstay- Running Backstays

- Shrouds/Sidestays (lower, upper w/spreaders)

- Staysail Stay

Compare the Rigs

Turnbuckle,Chainplate

Standing Rigging: Maintenance, Tuning

• Inspection / Maintenance

• Tuning– At the dock– When sailing

FVSPS Sail Course, Class 4

Sail Book, Section 5Sails

What are the Parts of a Sail?

Corners

- Head

- Tack

- Clew

Sides

- Luff

- Leech

- Foot

How are Sails Attached at the Corners?

- Tack: Shackle to bow (headsail) or to gooseneck (mainsail)

- Head: Shackle to halyard

- Clew: Bowline to sheets (headsail) or shackle to outhaul (mainsail)

How are Sails Attached at the Sides?

- Luff: Hank onto headstay or luff tape into furler foil (headsail), or slides or boltrope go into mast track (mainsail)

- Foot: Loose (headsail), loose or attached to boom by slides or boltrope (mainsail)

- Leech: Loose

Roller Furling

Advantages?

Disadvantages?

Jib Sizes

MainsailRoach

Spinnaker

Other Sails

Sail Section Questions,Assignments for Next Week

• Section 3

• Section 4

• Section 5

OTW Today

• Up-dated weather briefing?• List of people who want to sail today• Assignments to boats will be forthcoming

shortly during lunch period.• Any announcements from the captains?