Archive for May, 2012
spreaders extending laterally from the deck or from the base of a rotating wing mast. Deck spreaders increase the shroud angle, which allows for the use of lighter weight rigging and a lighter mast compared to a more conventional shroud arrangement. Deck spreaders also offer greater mast stability at the same rig tension as conventional set-ups, and have mostly been used on Open 60 class boats. Also called deck outriggers and shroud outriggers. See also: B & R rig.
an initialism for “velocity made good (toward the wind).” The upwind component of boat speed. Considered an information resource more for the trimmers than for the helm because changes in wind angle will immediately affect VMG, but boat speed lags in response to helm changes. See also: velocity header and velocity lift. Compare to: VMC.
a mark set 6 to 10 boat lengths from a primary mark in the same direction that the primary mark is to be rounded. An offset mark is set between 80 and 90 degrees to the wind direction and must be rounded in the same fashion as the primary mark. Most often used at weather marks, but may be used at leeward marks. For example, an offset mark is used to keep boats in the process of hoisting spinnakers and turning downwind away from those approaching the windward mark on a beat. Known as a hitch mark, spacer mark or spreader mark to British and Commonwealth sailors.
a wind vane mounted atop the masthead. Apparent wind angle is shown by the relationship of the wind vane’s head or tail to stationary tabs placed aft of the vane’s pivot point and at an approximately 30-degree angle to either side of the boat’s centerline. Some masthead flys are connected to the boat’s electronic instruments. British and Commonwealth sailors call it a wind hawk. See also: chicken, paddles, and Windex.
the current class of racing boats designed to the Volvo Ocean Race Box Rule. Anything is permitted in an open class unless the rules specifically prohibit it. Scored using a High Point System. For each leg, each boat receives points equal to the number of entries at the start of the leg less the number of boats that placed above her on that leg. Each boat can also earn points for passing through any defined scoring gates and for her in-port race finish position. The best cumulative score at the race’s end determines the winner. See also: box-rule and Equipment Rules of Sailing 2009-2012 rule C.2.3.
a line connected to and that controls an asymmetrical spinnaker’s tack. The line allows for positioning the a-sail’s tack to suit wind conditions and for adjusting the spinnaker’s luff tension. A tack line is led from an a-sail’s tack to a sheave at a bowsprit’s end or through a spinnaker pole’s jaw, and then back to the cockpit. On boats that use a pole for both a-sail and sym kites, a downhaul may serve double duty as a tackline. Also called a snout line or tack downhaul line, and occasionally a bobstay.
1) To sail towards the direction the wind blows from (i.e., windward) by making a series of tacks. A point of sail also known as close-hauled. Apparent wind speed is higher than true wind speed, because the boat is sailing into the wind. Boat speed and wind speed are cumulative. Also referred to as work. 2) A course’s upwind leg.