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In contrast to a simple light switch, which is a single pole, single throw (SPST) switch, multiway switching uses switches with one or more additional contacts and two or more wires are run between the switches. When the load is controlled from only two points, single pole, double throw (SPDT) switches are used.
The spinnaker pole is rigged to run from the base of the mast, [1] where there is a special fitting for attaching one end of the pole, out to windward over the side of the boat. There, one of the control lines of whichever sail it is to be used with is run through a fitting on the other end of the spinnaker pole. This allows for more precise ...
For example, a "2-pole" switch has two separate, parallel sets of contacts that open and close in unison via the same mechanism. The number of "throws" is the number of separate wiring path choices other than "open" that the switch can adopt for each pole. A single-throw switch has one pair of contacts that can either be closed or open.
When attached to a long bowsprit or "prod", an asymmetrical spinnaker can be larger than a conventional spinnaker, since it can be carried further forward of the boat than is possible with a conventional spinnaker pole and the foot of the sail can extend to deck level. [1] Many modern sailboats have retractable bowsprits to enable this expansion.
"To stay" is also a verb: to bring the ship's head up to the wind (to point the bow upwind). [2] This is done in order to go about (to tack ; tacking is sometimes also called staying the vessel [ 3 ] ); the bow of the ship turns upwind, then continues turning until the wind comes over the other side.
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In sailing, a boom is a spar (pole), along the foot of a fore and aft rigged sail, that greatly improves control of the angle and shape of the sail. The primary action of the boom is to keep the foot flatter when the sail angle is away from the centerline of the boat. The boom also serves as an attachment point for more sophisticated control lines.