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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 ...
Keep your patio cool with these elegant solutions that make your back patio feel like a luxury resort.
A wingsail, twin-skin sail [1] or double skin sail [2] is a variable-camber aerodynamic structure that is fitted to a marine vessel in place of conventional sails. Wingsails are analogous to airplane wings , except that they are designed to provide lift on either side to accommodate being on either tack .
A tide pool in Porto Covo, west coast of Portugal. A tide pool or rock pool is a shallow pool of seawater that forms on the rocky intertidal shore. These pools typically range from a few inches to a few feet deep and a few feet across. [1] Many of these pools exist as separate bodies of water only at low tide, as seawater gets trapped when the ...
It is commonly known by the names sea raft, by-the-wind sailor, purple sail, little sail, or simply Velella. [3] This small cnidarian is part of a specialised ocean surface community that includes the better-known cnidarian siphonophore, the Portuguese man o' war. Specialized predatory gastropod molluscs prey on these cnidarians.
Sail operating temperatures are a function of solar distance, sail angle, reflectivity, and front and back emissivities. A sail can be used only where its temperature is kept within its material limits. Generally, a sail can be used rather close to the Sun, around 0.25 AU, or even closer if carefully designed for those conditions. [3]