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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.
A calm haven. - Boats on a calm lake.
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A calm haven.

Added 4 weeks ago by Zeta

95

Boat in Chałupy - A boat with a chimney at the pier
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Boat in Chałupy

Added month ago by ha ha

85

Malta. Lighthouse. - Malta. Lighthouse.
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Malta. Lighthouse.

Added 2 months ago by Zeta

50

Yachts 1 - Yachts at the marina by the water
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Yachts 1

Added 3 months ago by ella

15

Masurian lake. - Sailboat in Masuria.
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Masurian lake.

Added 3 months ago by Zeta

65

Landscape - colorful jigsaw puzzle
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Landscape

Added 4 months ago by andi

140

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

Added 4 months ago by Zeta

100

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

Added 4 months ago by Zeta

42

SAILING SAIL - SAILING SAIL IN MIKOŁAJKI
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SAILING SAIL

Added 4 months ago by kasia

24

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

Added 4 months ago by Zeta

85

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

Added 4 months ago by Grażyna

98

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

Added year ago by Zeta

104

Marina. - Yacht port at the lake.
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Marina.

Added year ago by Zeta

37

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

Added year ago by Zeta

78

Marina. - Yacht port in the fog.
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Marina.

Added year ago by Zeta

36

Colorful sailing ships - colorful jigsaw puzzle
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Colorful sailing ships

Added year ago by andi

324 1

White sails - sailing trip with a sailing ship
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White sails

Added year ago by andi

42

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

138

Landscape - complicated puzzle
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Landscape

Added year ago by andi

107

Landscape - complicated puzzle
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Landscape

Added year ago by andi

280 1

Landscape - beautiful landscapes
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Landscape

Added year ago by andi

219

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

Added year ago by ewunia x

355 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

170

Canary Islands - such a great sport on the water
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Canary Islands

Added over a year ago by bronisława

27

Candelaria Molfese - Candelaria Molfese (ur 3 stycznia 1991 w Buenos Aires , Argentyna ) jest argentyńska aktorka, piose
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Candelaria Molfese

Added over a year ago by Kamcia2

20

zachód na molo - Międzyzdroje bicz molo
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zachód na molo

Added over a year ago by robin

4

Candelaria Molfese - W 2010 Molfese miał rolę w musicalu argentyńskiej dzieci, Juntas r Revueltas. Przedstawienia odby
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Candelaria Molfese

Added over a year ago by ogórkowa

14

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

331

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

394

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

531

Varun Dhawan - Przystojny Varun na sesji zdjęciowej.
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Varun Dhawan

Added over a year ago by Kavya Pratap Singh

8