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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.).
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.
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]
The dinghy is sailed by two people and has a main, a jib and an asymmetric spinnaker. [2] It has a PY of 948 [3] and a D-PN of 82.3. [4] Performance and design.
The hull dimensions are 11 ft 11 in length and 4 ft 10 in beam. The boat has a draft of 3 ft 6 in with the centreboard down. The sail area (main and jib) is 75 sq. ft. [1] The class symbol is a stylised glass bubble; due to the original lightweight "cigar box cedar" construction of the prototypes, the name 'Bubble' was first used for the boat. [2]
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.