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Sail Plan
A sail-plan is a set of diagrams, which shows the best combinations of
sail proposed for a particular ship. These diagrams are usually prepared
by a naval architect and consist of three configurations to be used for
the three different forms of air currents.
A light air sail-plan:
Force 1 or less is the air force, which cover the majority of the Earth,
most of the time. An efficient sail-plan would include a set of vast,
lightweight sails to keep the ship underway in light wind.
A working sail-plan:
This set of sails is for the rapidly changing conditions. These sails
are stronger than light air sails, but are lightweight.
A storm sail-plan:
These are small, rugged sails flown in gales, to keep control of the
vessel and to keep it under way.
When constructing a sail-plan, the architect's endeavor is to balance
the force of the sails with the drag of the keel so that the vessel
naturally heads into the wind, as well as balance the wind force of each
sail with the ballast of the ship. By doing this, if control of the ship
is lost, then the ship will avoid broaching, or turning edge-to-the
wind, and risk being capsized or beaten by breaking waves.
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