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An asymmetric spinnaker is particularly effective on fast planing dinghies and ultra-light displacement boats as their speed generates an apparent wind on the bow allowing them to sail more directly downwind. An asymmetric spinnaker can also be a simpler sail for a cruiser or short-handed sailer than a symmetric one. [7]
Like the symmetric, the asymmetrical spinnaker is often stored in a turtle, with the corners on top for easy access. 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.
Sail components include the features that define a sail's shape and function, plus its constituent parts from which it is manufactured. A sail may be classified in a variety of ways, including by its orientation to the vessel (e.g. fore-and-aft) and its shape, (e.g. (a)symmetrical, triangular, quadrilateral, etc.).
It was the first production boat featuring a retractable bowsprit, which allows for an unusually large asymmetrical spinnaker. [2] It was introduced in 1991 by J/Boats and designed by Rod Johnstone. [3] J/105s are a common sight in one design racing [4] and to date, J/Boats has built 685 J/105s. [5]
Guy (red arrow), controlling the spinnaker pole. A guy (probably from Dutch gei, "brail") is a line attached to and intended to control the end of a spar on a sailboat. [1] On a modern sloop-rigged sailboat with a symmetric spinnaker, the spinnaker pole is the spar most commonly controlled by one or more guys.
49er with a gennaker (yellow). A gennaker is a sail that was developed around 1990. Used when sailing downwind, it is a cross between a genoa and a spinnaker.It is not symmetric like a true spinnaker but is asymmetric like a genoa, but the gennaker is not attached to the forestay like a jib or genoa.
A spinnaker pole is a spar used in sailboats (both dinghies and yachts) to help support and control a variety of headsails, particularly the spinnaker. It is also used with other sails, such as genoas and jibs , when sailing downwind with no spinnaker hoisted, sometimes using a special light spinnaker pole called a whisker pole , possible since ...
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.