Other Definitions
spinnaker (dict)
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SpinnakerA spinnaker is a special sail that is designed specifically for sailing downwind (with the wind behind the boat). A spinnaker resembles a parachute somewhat in both construction and appearance. It is constructed of very lightweight nylon fabric, often of a bright color. When deployed, it fills with wind and balloons out in front of the boat. A spinnaker operates by filling with air and pulling the boat along behind it. This is in contrast to a mainsail and jib, which power the boat using the principles of aerodynamics, by providing lift much as the wing of an aircraft does. Types of spinnakers There are mainly two categories of spinnakers, symmetric and asymmetric. The symmetric one is the most classic type, running symmetrical alongside the boat with a guy running from each corner of the sail, the windward one stabilized with a spinnaker pole. The spinnaker pole must be moved in each jibe, and is therefore quite difficult for beginners to use. However, it can be sailed in all downwind wind directions. The asymmetrical spinnaker is a new approach to the spinnaker, introduced in the 1993 America's Cup. It is an asymmetric sail, fastened like a genoa but much larger. It is very easy to gybe with, since it only requires loosing the windward guy and hauling in on the other one. Often is the lower corner extended from the boat to give the sail more wind. A big advantage with this asymmetrical spinnaker is the much reduced chance of broaching. Broaching usually occurs with symmetric spinnaker when a large blow makes the sail collapse and fill from the wrong side. This results in an extreme sideways force, the boat turns quickly towards the wind while heeling very, very much to the lee. A broach is very uncomfortable and dangerous, and sometimes leads to a complete capsize. The symmetric spinnaker also requires care when packing, since the three corners must be available on the top of the packing. Objects with Spinnaker Shape In Portsmouth the construction of the Spinnaker Tower is due to be complete in the Summer of 2005. External links
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