Airfoils+-+Sails

=**Flying in a boat with one wing underwater...**=
 * [[image:sailboat-parts.gif width="375" height="375"]] || ==== ====

The forces that keep an airplane up also cause a sail boat to move forward.
|| Source: adventure.howstuffworks.com || ====.====
 * [[image:sailboat---bernoulli.gif width="378" height="378"]]

You can see this in action in the diagram below -

 * ====the plane wing airfoil at the top,====
 * ====the sail airfoil at the bottom====



Source: www.catamaranvega.com ||
 * [[image:fig2.jpg width="292" height="292" align="center"]]

Source: www.catamaranvega.com || ==The Keel - an underwater wing...==

has no choice but to move forward in the direction of** B. **
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 * ====A sailboat can't sail directly into the wind. If it does, the sail====

Then Bernouilli effect takes over....
|| Source:jtmsailing.com || =Lake Waihola Sailing Day - putting all your knowledge to the test= http://www.layline.com
 * [[image:optiLS.gif width="456" height="266"]]

air flow over the foil.
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 * [[image:boat-rules-diagram-z.png]]

**Starboard**: the right-hand side of the boat
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 * ====[[image:fig8_.png width="116" height="97"]][[image:bowline.png width="114" height="96"]][[image:cleatdeck.png width="112" height="94"]][[image:roundturn.png width="106" height="89"]]====

Learn to tie them **[|here]**
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