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While a symmetric spinnaker is flown with a "guy" and a "sheet", an asymmetric spinnaker is flown with a tackline and a "sheet." The tack attaches to the bow or (often retractable) bowsprit, and the two sheets attach to the clew. The head of the sail is attached to the spinnaker halyard, which is used to raise the sail.
Since there is no spinnaker pole, there is no longer need for a pole topping lift or a pole downhaul. Like a jib, the asymmetric has two sheets and no "guy". The asymmetric is simpler to gybe than a conventional spinnaker since it only requires releasing a sheet and pulling in the other one, passing the sail in front of the forestay. An ...
The jib sheet attaches to the clew of the jib, and controls it. The jib has a sheet on each side, only one of which (the leeward one) will be in use at one time. The spinnaker sheet attaches to the clew(s) of the spinnaker, if carried. A symmetrical spinnaker has two sheets, an "active" one and a "lazy" one, in the same way as a jib, but they ...
Because a spinnaker has two clews, there is always a second line identical to the afterguy attached to the leeward clew of the spinnaker. This is called the sheet and serves a slightly different function. When the boat jibes, the spinnaker pole will be moved from one side of the boat to the other, causing the sheet to become the guy and vice versa.
A jib, left, compared to a roughly 110% genoa, right. The foretriangle is outlined in red. The term jib is the generic term for any of an assortment of headsails.The term genoa (or genny) refers to a type of jib that is larger than 100% of the foretriangle, which is the triangular area formed by the point at which the stay intersects the mast, and deck or bowsprit, and the line where the mast ...
Its similarity with a spinnaker is that it is not attached to a stay along its luff, and typically has a slightly larger curvature than a genoa. Luff shape and tension is maintained by the halyard and a bolt rope which is woven into the sail itself, and it is this stiff tensioned rope which allows the sail to be furled on itself.
When Pauling and Corey first proposed the alpha sheet, they suggested that it agreed well with fiber diffraction results from beta-keratin fibers. [2] However, since the alpha sheet did not appear to be energetically favorable, they argued that beta sheets would occur more commonly among normal proteins, [3] and subsequent demonstration that beta-keratin is made of beta sheets consigned the ...
14 – spinnaker pole 15 – backstay 16 – forestay 17 – boom vang Stays are ropes, wires, or rods on sailing vessels that run fore-and-aft along the centerline from the masts to the hull , deck , bowsprit , or to other masts which serve to stabilize the masts .