sail

A sail is a tensile structure—made from fabric or other membrane materials—that uses wind power to propel sailing craft, including sailing ships, sailboats, windsurfers, ice boats, and even sail-powered land vehicles. Sails may be made from a combination of woven materials—including canvas or polyester cloth, laminated membranes or bonded filaments—usually in a three- or four-sided shape. A sail provides propulsive force via a combination of lift and drag, depending on its angle of attack—its angle with respect to the apparent wind. Apparent wind is the air velocity experienced on the moving craft and is the combined effect of the true wind velocity with the velocity of the sailing craft. Angle of attack is often constrained by the sailing craft's orientation to the wind or point of sail. On points of sail where it is possible to align the leading edge of the sail with the apparent wind, the sail may act as an airfoil, generating propulsive force as air passes along its surface—just as an airplane wing generates lift—which predominates over aerodynamic drag retarding forward motion. The more that the angle of attack diverges from the apparent wind as a sailing craft turns downwind, the more drag increases and lift decreases as propulsive forces, until a sail going downwind is predominated by drag forces. Sails are unable to generate propulsive force if they are aligned too closely to the wind. Sails may be attached to a mast, boom or other spar or may be attached to a wire that is suspended by a mast. They are typically raised by a line, called a halyard, and their angle with respect to the wind is usually controlled by a line, called a sheet.
Yachts 1 - Yachts at the marina by the water
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Yachts 1

Added yesterday by ella

1

Masurian lake. - Sailboat in Masuria.
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Masurian lake.

Added 2 days ago by Zeta

33

Landscape - colorful jigsaw puzzle
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Landscape

Added 2 weeks ago by andi

133

Sailboat on the lake. - Sailboat on the lake.
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Sailboat on the lake.

Added 3 weeks ago by Zeta

95

Sailboat on the lake. - Sailboat on the lake.
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Sailboat on the lake.

Added month ago by Zeta

37

SAILING SAIL - SAILING SAIL IN MIKOŁAJKI
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SAILING SAIL

Added month ago by kasia

17

Seals on the yacht. - Seals sleeping on a yacht.
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Seals on the yacht.

Added month ago by Zeta

77

Lake View. - One of the lakes in Switzerland.
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Lake View.

Added month ago by Grażyna

95

Fishing boat. - Fishing boat. Village.
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Fishing boat.

Added month ago by Zeta

102

Sailboat in the sea. - Sailboat on the turquoise sea.
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Sailboat in the sea.

Added 2 months ago by Zeta

20

Sailboats on Lake Geneva - Sailboats on the Geneva lake. Switzerland.
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Sailboats on Lake Geneva

Added 2 months ago by Zeta

33

Marina. - Yacht port at the lake.
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Marina.

Added 2 months ago by Zeta

36

Boats on the bay. - Boats on the bay at sunset.
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Boats on the bay.

Added 2 months ago by Zeta

67

Marina. - Yacht port in the fog.
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Marina.

Added 2 months ago by Zeta

33

Colorful sailing ships - colorful jigsaw puzzle
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Colorful sailing ships

Added year ago by andi

322 1

White sails - sailing trip with a sailing ship
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White sails

Added year ago by andi

34

Landscape - complicated puzzle
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Landscape

Added year ago by andi

87

Landscape - complicated puzzle
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Landscape

Added year ago by andi

136

Landscape - complicated puzzle
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Landscape

Added year ago by andi

105

Landscape - complicated puzzle
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Landscape

Added year ago by andi

273 1

Landscape - beautiful landscapes
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Landscape

Added year ago by andi

216

Under the sails - Tall ship on the high sea at sunset
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Under the sails

Added year ago by ewunia x

354 1

DOLCE NAVIGARE - IMAGINE OF SWEET SEE
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DOLCE NAVIGARE

Added year ago by paolo

56

ice cream let go - boat, sail, passengers, water, trees
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ice cream let go

Added year ago by wieslawa

169

zachód na molo - Międzyzdroje bicz molo
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zachód na molo

Added year ago by robin

4

Z serii krajobrazy - Mieszkać to na pewno bym nie chciała w tych drapaczach ale za to widok z nich niesamowity?!
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Z serii krajobrazy

Added over a year ago by Marysia

449

parada żaglowców - żaglowiec,emeryt,ludzie,żagle
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parada żaglowców

Added over a year ago by wieslawa

327

w Hong Kongu pod żaglami - woda,żagiel,łódz,domy
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w Hong Kongu pod żaglami

Added over a year ago by wieslawa

392

Italia - Jezioro Garda - Italia - Jezioro Garda
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Italia - Jezioro Garda

Added over a year ago by Anabell

304

Statek Wikingów. - Statek Wikingów.Statek Wikingów.
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Statek Wikingów.

Added over a year ago by Koliber

523

Varun Dhawan - Przystojny Varun na sesji zdjęciowej.
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Varun Dhawan

Added over a year ago by Kavya Pratap Singh

8

Łódź na morzu - Obraz przedstawia łódź - jacht na morzu. Na jachcie widać żeglarzy z pasją.
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Łódź na morzu

Added over a year ago by Mariola

179