apparent wind
Steve Colgate
Apparent wind is a very simple concept that continues to mystify many people who have been sailing for years.
Apparent wind- The direction of the wind as it appears when the boat is moving. This varies with speed and direction of the boat.
Astern- To the rear of a boat.
Athwart- Across a boat; at right angles to the fore-and aft line.
Apparent Wind: The perceived wind direction of a moving yacht. When the yacht goes faster, the perceived wind direction moves forward, just as the wind always seems to hit a car only from head-on as it drives at high speeds.
Apparent wind
The combination of the true wind and the wind caused by the boat's own speed. This is the wind felt on the boat, as well as the one shown by the telltales.
Ashore ...
Apparent wind The wind felt aboard the boat underway.
Athwart From side to side.
Avast To stop, to hold fast, e.g. avast heaving.
Apparent Wind - the direction of the wind as is relative to the speed and direction of the boat
Astern - behind the boat
Bail - to remove water from the boat ...
apparent wind
The direction and velocity of wind as felt in a moving boat.
astern
The direction toward or beyond the stern.
Apparent Wind: The wind one feels when moving. A combination of true wind speed and that created by the moving yacht.
Aspect Ratio: The height of a sail or keel divided by its width.
apparent wind - The force and direction of the wind relative to a moving vessel, differing from the true wind. The motion, of an underway vessel, makes an effective wind.
Apparent Wind:
The direction and speed of the wind as it appears to those on board, relative to the speed and direction of the boat; combination of the true wind and the wind caused by the boat's movement through the water.
Apparent Wind
The apparent direction of the wind, which is affected by a boat's motion. The apparent wind is only the same as the true wind if the boat is stopped.
Astern ...
apparent wind
The strength and direction of the wind as felt in a moving boat. It is the true wind modified by the boat's movement. An apparent wind indicator (AWI) shows the direction of the apparent wind. Compare with true wind.
appendage ...
Anchor Buoy - A buoy attached to, or marking the position of, an anchor.
Apparent wind - The direction of the wind as is relative to the direction and speed of the boat
Astern - At or near or toward the stern of a ship. behind the boat ...
Angle of Attack - The angle between the sail and the apparent wind or the rudder or centerline and the water flow.
Angle of Cut - In navigation, the smaller angle at which two position lines on a chart intersect.
Beam reach - a point of sail where the boat is sailing at a right angle to the apparent wind.
Bear Away/Bear Off: See Head Down.
Bearing - a compass direction from one point to another ...
telltales: short pieces of yarn, ribbon, thread, or tape attached to the sail which are used to show the air flow over the sail; or when attached to the shroud indicate apparent wind direction.
Apparent Wind - (see Relative Wind).
AIS - Universal Shipborne Automatic Identification System (AIS). AIS operate primarily on VHF radio frequencies, with a coverage range of 20 to 30 nautical miles.
On board a moving boat you feel the apparent wind, which is different than the true wind that acts on stationary objects. When running with light winds, the apparent wind may be close to zero.
Code 1 The code 1 is a light air reaching sail, where the apparent wind angles at low speeds has a significant effect to create angles of less than 90 degrees.
This reduces the force of the apparent wind and may allow you to navigate the boat away from the path of the storm or into safer waters. If large waves are present, the boat may begin to surf down the waves.
Sailing nearly as fast as the wind, we kept bending the apparent wind forward, creating ideal reaching conditions. We executed a series of jibes and the boat, and all its 25 feet and 7 inches of beam, came through the wind with alacrity.
Anemometer: Navigational instrument that measures the speed of the apparent wind
Anticyclone: High-pressure area, a meteorology term ...
Sailing on a point of sail such that the apparent wind is coming from the beam (side) of the boat at about a 90° angle. A beam reach is usually the fastest point of sail. A beam reach is a point of sail between a broad reach and a close reach.
GHOST-To make headway when there is no apparent wind.
GRAB RAIL-Railing, usually on cabin top, used as handhold.
Page 251 ...
true wind
Direction and velocity of wind as measured on land, distinct from apparent wind.
T-top
Short, aluminum tower with overhead canvas to protect the helm.
Apparent wind: The difference between natural and movement generated wind.
Aspect Ratio: The relationship between the sails height (luff ) and length along the foot.
A mast head fitting with a wind vane arrow and two aft-facing legs that approximately coincide with the close-hauled apparent wind angle.
WINDLASS: A power winch on the bow of the vessel to pull the anchor up, usually electric.
knot used to bend a line to a ring, also called an fisherman's bend anchor lights Lights displayed according to the Rules of the Road when a boat is at anchor anemometer An instrument used to measure the velocity of the wind apparent wind ...
 See also: Boat, Forward, Sailing, Wind, Light
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