The forces transmitted via the sails are resisted by forces from the hull, keel, and rudder of a sailing craft, by forces from skate runners of an iceboat, or by forces from wheels of a land sailing craft to allow steering the course.
Throughout history sailing has been instrumental in the development of civilization, affording humanity greater mobility than travel over land, whether for trade, transport or warfare, and the capacity for fishing.Conventional sailing craft cannot derive power from sails on a point of sail that is too close into the wind.On a given point of sail, the sailor adjusts the alignment of each sail with respect to the apparent wind direction (as perceived on the craft) to mobilize the power of the wind.Instructions: Click on an episode and select "open" if prompted. If it doesn't or if you receive an error message, download the free Real Player software and then come back here and try again.If that doesn't work, email us at [email protected] we can help.As applied to wind, apparent wind velocity (V) is the air velocity acting upon the leading edge of the most forward sail or as experienced by instrumentation or crew on a moving sailing craft.
In nautical terminology, wind speeds are normally expressed in knots and wind angles in degrees.
Additionally, sails may interact with one another to create forces that are different from the sum of the individual contributions each sail, when used alone.
The term "velocity" refers both to speed and direction.
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Conventional sailing craft cannot derive power from the wind in a "no-go" zone that is approximately 40° to 50° away from the true wind, depending on the craft.