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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.

Right-hand boat: Up wind (close-hauled) with attached airflow like a wing—predominant lift component both propels the boat and contributes to heel.

Lawrence, and eventually began to explore the Pacific Northwest and the Western Arctic.

Sailing has contributed to many great explorations in the world.

The earliest representation of a ship under sail appears on a painted disc found in Kuwait dating between 50 BCE.

Advances in sailing technology from the Middle Ages onward enabled Arab, Chinese, Indian and European explorers to make longer voyages into regions with extreme weather and climatic conditions.

Until the mid of the 19th century, sailing ships were the primary means for marine commerce, this period is known as Age of Sail.

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.

Aerodynamic force components for two points of sail.

Left-hand boat: Down wind with detached air flow like a parachute— predominant drag component propels the boat with little heeling moment.

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.

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