sailing ship live wallpaper 1.1

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sailboats are one of humankind's first and most revolutionary transportation inventions. live wallpaper boat. powered mainly by the wind, these simple but incredible machines opene­d up new pathways for international trade, exploration and cultural exchange, which shaped the modern world. although no one knows when the first sailboat was built, archeologists have found remains of primitive canoe-like vessels dating back to ancient egypt and mesopotamia. since then, boat design has developed steadily to enhance speed, ma­neuverability and cargo load, reflecting unique aesthetic and technological innovations.

sails work by “catching the wind” only when the boat is sailing downwind. live wallpaper boat. the rest of the time, a sail is essentially an airplane wing standing on end, and works the same way, when properly trimmed, the sail’s leading edge—the luff—points into the wind, creating higher pressure on the windward side and lower pressure on the leeward side. the sail “lifts,” or moves, toward the lower-pressure side causing the boat to move. this happens because the sail isn’t a flat sheet of cloth, it’s curved, like a wing and the air traveling over the topside of the curved portion travels faster than that traveling on the underside. live wallpaper boat. (the curvature, or “draft,” is built-in by the sailmaker, through careful cutting and sewing of the narrow panels that make up the sail.)

not all of the lift developed by a sail moves the boat ahead. since the direction of lift is roughly at right angles to the sail, live wallpaper boat, some of it tries to pull the boat sideways, too—but the shape of the hull and keel combined with the rudder creates a high resistance to the sideways force, "driving" the boat ahead. how much of the total lift acts to pull the boat forward and how much sideways depends on the “point of sail,” the angle between the boat and the wind: closer to the wind = more sideways component, because the sail is trimmed in closer to the centerline of the boat. because of this, when “beating” into the wind, most sailboats move a little bit sideways as well as ahead. sailors call this “making leeway,” and always take it into account when navigating or sailing in close quarters.

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