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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.
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.
By either hauling or easing the line, the tension in the luff can be changed, thereby shifting the point of maximum draft of the sail forward or aft respectively, optimizing sail shape and thus performance. It is a fine control which is used more frequently on racing sailboats than on cruising or day-sailing boats. [2]
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.
Leading lights, also known as range lights in the United States, are a pair of light beacons used in navigation [2] to indicate a safe passage for vessels entering a shallow or dangerous channel; they may also be used for position fixing. At night, the lights are a form of leading line that can be used for safe navigation. The beacons consist ...
The ring was attached to a long, thin pole (the whipstaff proper) and this pole connected the tiller to the helmsman one or more decks above it through a pivot point, roll, or rowle, described as "that round piece of wood or iron wherein the whip doth go and is made turn about that it may carry over the whip from side to side with more ease."
At roughly the same moment the wind will fill the mainsail and a shock load will transfer into the mast and rigging and a dismasting might occur. To help prevent accidental jibes, sailors will frequently tie a line to the end of the boom to secure the boom to one side of the vessel. This line is typically called the jibe preventer.
Leech line with jam cleat to control the tension on the leach of a sail Modern sails may come with a standard leech line ( leech control ) that runs under the back edge of the mainsail . This line is usually fixed at the head of the sail, and the other end can be cleated near the clew of the sail.