9
Wind is the only source of propulsion for your Nirvana. The sails use
the wind to propel your boat through the water. Your sail pivots off
the mast allowing it to catch the wind at a variety of different angles,
making it possible to sail in many directions, including against the
wind. Technically, the sail acts as an airfoil, like the wings of an air-
plane, when the wind hits it. The air moving along the inside of the
sail is forced to move more
slowly than the air on the
outer side of the sail. This
creates a pocket of low
pressure on the forward
side of the sail, which pulls
the boat through the water.
While that is scientifi cally
accurate, when learning to
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