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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 ...
It provided shade from the sun for up to one third of the arena. The velarium also created a ventilation updraft, creating circulation and a cool breeze. [2] It is believed that sailors from the Misenum fleet, with their background in sailmaking and rigging were employed to build, maintain and operate the velarium.
Awnings were first used by the ancient Egyptian and Syrian civilizations. They are described as "woven mats" that shaded market stalls and homes. A Roman poet Lucretius, in 50 BC, said "Linen-awning, stretched, over mighty theatres, gives forth at times, a cracking roar, when much 'tis beaten about, betwixt the poles and cross-beams".
Proposed shade designs include a single-piece shade and a shade made by a great number of small objects. Most such proposals contemplate a blocking element at the Sun-Earth L1 Lagrangian point . Modern proposals are based on some form of distributed sunshade composed of lightweight transparent elements or inflatable "space bubbles" manufactured ...
Direct drive, in which an actuator is attached to the steering quadrant, at the top of the rudder stock inside the boat. This is the least intrusive method of installation. Wheel mounting, in which a motor is mounted near the steering wheel, and can be engaged with it when in use. This typically involves either a belt drive or a toothed gear ...
For a given sail area a gaff rig has a shorter mast than a Bermudan rig.In short-ended craft with full body, heavy displacement and moderate ballast ratio, it is difficult to set enough sail area in the Bermudan rig without a mast of excessive height and a centre of effort (CE) too high for the limited stability of the hull. [8]
The foot of a Bermuda sail may be attached to the boom along its length, or in some modern rigs the sail is attached to the boom only at its ends. This modern variation of a Bermuda mainsail is known as a loose-footed main. In some early Bermudian vessels, the mainsails were attached only to the mast and deck, lacking booms.
The Keying was a Chinese ship that employed a junk sailing rig. Scale model of a Tagalog outrigger ship with junk sails from Manila, 19th century. The junk rig, also known as the Chinese lugsail, Chinese balanced lug sail, or sampan rig, is a type of sail rig in which rigid members, called battens, span the full width of the sail and extend the sail forward of the mast.