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This durable and easy-to-install shade sail comes in a slew of sizes — too many for us to even count — all the way down to 4 x 5 feet. The smaller sizes are particularly notable, since many ...
Shade sail over playground in Australia. A shade sail − or somewhat more precise a textile sunshade sail or a textile sun protection sail − is a device to create outdoor shade based on the textile basic technology that can be found in a ship's sail. [1] Shade sails use a flexible membrane tensioned between several anchor points. While ...
Shade screens utilize acrylic canvas or a mesh fabric, which allows some view-through while blocking the sun's rays. The roller at the top may be hand-cranked or motorized. [ 5 ] The fabric is gravity-fed, with a weighted bottom rail pulling the fabric down between guide rails [ broken anchor ] or guy wires .
To set the sail the clewlines and buntlines are let go, and the sheets (attached to the bottom corners, or clews, of the sail) are adjusted to shape the sail to best catch the wind. A device called a "tye", a "tye chain", or a "tye rope" is used for lifting a given yard to the top of its travel to set the sail.
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In sailing, a boom is a spar (pole), along the foot of a fore and aft rigged sail, that greatly improves control of the angle and shape of the sail. The primary action of the boom is to keep the foot flatter when the sail angle is away from the centerline of the boat. The boom also serves as an attachment point for more sophisticated control lines.
The temperature differences between the hot and cold sides of the James Webb Space Telescope five-layer sunshield. The sunshield acts as large parasol allowing the main mirror, optics, and instruments to passively cool to 40 kelvins (−233 °C; −388 °F) or cooler, [6] and is one of the enabling technologies that will allow the JWST to operate. [10]
Transpired solar collectors are usually wall-mounted to capture the lower sun angle in the winter heating months as well as sun reflection off the snow and achieve their optimum performance and return on investment when operating at flow rates of between 4 and 8 CFM per square foot (72 to 144 m3/h.m2) of collector area.
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