MUN Sailing Introduction to Sailing Theory Instructional Session #1 With: Daniel Rees.
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Transcript of MUN Sailing Introduction to Sailing Theory Instructional Session #1 With: Daniel Rees.
![Page 1: MUN Sailing Introduction to Sailing Theory Instructional Session #1 With: Daniel Rees.](https://reader030.fdocuments.in/reader030/viewer/2022032705/56649db05503460f94a9e8f3/html5/thumbnails/1.jpg)
MUN SailingIntroduction to Sailing Theory
Instructional Session #1
With: Daniel Rees
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Lesson Outline:1.) Anatomy of a Sailboat
2.) Bernoulli Principle
3.) Points of Sail
4.) Tacking & Gybing
5.) The Principles of Wind
6.) Classifying & Identifying Wind
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Anatomy of a Sailboat 1.) Sail Area 2.) Keel/Daggerboard/Centreboard 3.) Rudder 4.) Hull 5.) Rigging
Centre of Effort (CE)- Sail Area
Centre of Lateral Resistance (CLR)- Keel/Daggerboard/Centreboard- Rudder- Hull
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Bernoulli Principle
- Like an airplane foil, sails allow a vessel to generate lift.
- When lift is countered by the resistant forces of the boat (CLR) it converts the lift into thrust and allows sailboats to move forward.
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Key TermsLift: Result of the Bernoulli Principle and high/low pressure systems on a foil.
Thrust: The force of a sailboat to move forward through the water. Is a result of the power of the wind as it generates lift and is countered by drag.
Resistance/Drag: The force the boat meets as it pushes water aside (Displacement Hull). Is coupled with lift to produce thrust. Without resistance a boat would slide-slip endlessly.
Buoyancy: Keeps the boat up in the water (Positive, Neutral, Negative). Equivalent to force of gravity on airplanes.
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Forces of Sailing
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Foils: Endless Possibilities!Airfoils: - Like a sail
Hydrofoils: - Like a sail – but underwater. - Use the principles of water to create high/low pressure systems.
https://www.youtube.com/watch?v=5doBIv3TVbA
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Points of Sail
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Getting ThereTacking: Change of the boat’s sailing angle, such that the bow passes through the wind.
Gybing: Change of the boat’s sailing angle, such that the stern passes through the wind.
Short Tacks vs. Long Tacks- Banging a Corner.- Beating it.
What are the advantages + what are the disadvantages?
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Tacking TacticsThings to Consider:
- Energy Conservation
- Wind Shifts (Knock or Lift?)
- Sail Trim (Boat Maintenance)
- Tides
- Geographic Limitations
- Other vessels
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Wind Shifts• Knock/Header: A wind shift that pushes your sailing angle away
from your desired position. Dependent on the situation, it may be better to tack over.
• Lift: A wind shift that favors your sailing angle and lets you sail at a closer angle to your desired position. Adjust bearing and sail on!
“A bad wind blows someone good.” – Nan Chaytor
- A knock on one tack is a lift on another!
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Wind Shadows
Geographic Wind Shadows
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Wind Shadows
Opponent Boat Wind Shadow
“Dirty Air”
“Covering”
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LOLZ
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Wind ChannelsGeographic
Wind Channels
Fjord of Norway
High Pressure Zones
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Beaufort Wind Scale
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Identifying Wind Direction• Flags• Smoke• Cloud Movement• Waves• Wind Indicator• Sound in your ears• Grass Flick• Check your sails
DO NOT LICK YOUR FINGER -ewww
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Questions?
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Thanks for hanging out with us!