Sailing Analysis

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					      Analytical Sailing
How to get to the finish faster and
have more fun through
understanding a little bit more
about what the hell is going on!
Sailing fast is what wins races at
the club level.

The goal of this course is present some
 mathematical and physical tools that
 may give some insight and help sailors
 develop strategies to get around a race
 course faster. It will NOT cover such
 matters as sail trim or tuning, though
 they may be touched on.
Topics to be Discussed

• Strategy vs. Tactics
• How the motion of the boat affects
  the wind that acts on it. True and
  Apparent Wind and the Strategies
  that make use of understanding.
• The Around-the-Buoys Race Course
  and the difference in importance of
  different parts of it.
    Strategy vs. Tactics
• Strategy is your plan to get where you
want to go as fast as possible, in the
absence of competitors. That’s mostly
what this course is about.

• Tactics have to do with what you do to
beat your competitors. For example, that
would include using the rules, gassing and
True and Apparent Wind

• Telling the difference between changes
  in wind speed and direction.
• A strategic approach to deal with lifts and
  headers when going to windward.
• A Strategic approach to the off-wind legs.
         Mark Roundings

Use your speed to help the crew and to get
  to the next mark fast. That does not
  mean that you should always sail at
  maximum speed.
When a Little Extra Effort Can
Pay Big Dividends.

Work on trying the hardest when the going
 is the most tedious.
VMG (Velocity Made Good) is often the key
 to success.
Remember that the goal is to keep the time
  average of VMG as high as possible.
The “True” Length of the Course

The distance through the water is almost
always longer than the measured course
That extra distance is especially large on
windward legs and, to a lesser extent, runs
(a function of boat type).
The extra distance depends strongly on
the details of the course.
• You are standing in the middle of a big field
with a moderate breeze (say 15 mph) blowing
and your friend George is 100 feet to
windward. You find that you can easily
understand what he’s saying, but you have to
shout for him to hear anything at all. A writer
might say “the words were ripped from your
mouth”, but that’s nonsense. The speed of
sound is ~1000 ft/s and the wind is ~ 20 ft/s,
so the wind is a negligible fraction of the
speed of sound. What’s going on?

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