NationMaster - Encyclopedia: Preventer

A Preventer is a mechanical device on a sailing vessel which limits the boom's ability to swing dangerously across the boat during an accidental gybe. There are several meanings of the word boom: a sound such as a sonic boom - onomatopoeia the sound of an explosion. ... Gybe (also spelled jibe) is when a sailing boat (yacht) turns its stern through the wind, such that the wind changes from one side of the boat to the other. ...

The uncontrolled gybe is feared by all sensible yachtsmen. The heavy boom can potentially inflict severe head injuries or dispatch crew members over board while the mainsheet or traveller can also inflict serious injury. Quite apart from that uncontrolled gybes can also lead to serious gear failure. Gybe (also spelled jibe) is when a sailing boat (yacht) turns its stern through the wind, such that the wind changes from one side of the boat to the other. ... There are several meanings of the word boom: a sound such as a sonic boom - onomatopoeia the sound of an explosion. ... In sailing, a sheet is a line (or rope) used to control how much wind a sail (or part of a sail) gathers. ...

Rigging a preventer on a yacht's mainsail is often performed when the wind is behind the beam (i.e. when it's coming from more than 90° off the bow). It can also be useful at other times when there is more swell than wind, so the wind may not have the strength to keep the boom in place as the boat dips and rolls. A mainsail is the most important sail raised from the main (or only) mast of a sailing vessel. ... Wind is the quasi-horizontal movement of air (as opposed to an air current) caused by uneven heating of the Earths surface. ... Wind is the quasi-horizontal movement of air (as opposed to an air current) caused by uneven heating of the Earths surface. ... There are several meanings of the word boom: a sound such as a sonic boom - onomatopoeia the sound of an explosion. ...

On any boat that is sailing downwind without a preventer, strict 'heads-down' procedures must be enforced anywhere within the boom's arc. Certain areas of the side-decks and maybe the cockpit also have to be strictly 'no-go' to all crew depending on what the boom and mainsheet could do there in unchecked full swing.

Commercial products are available that operate in various ways, but the simplest and strongest preventer is a line, from the end of the boom, led outside of the shrouds and a long way forward - perhaps right up to the bow - through a block, back to the cockpit and secured within reach of the mainsheet. Care should be taken when selecting the line which is used - some rope available on board will stretch under strain rendering the preventer useless. On a sailboat, the shrouds are pieces of standing rigging which hold the mast up from side to side. ... In sailing, a block is a pulley or a number of pulleys enclosed in sheaves so as to be fixed to the end of a line or to a spar or surface. ... Cockpit of a light aircraft, showing instrumentation dials and dual control yokes. ... In sailing, a sheet is a line (or rope) used to control how much wind a sail (or part of a sail) gathers. ...

Gybing

If the boat is to be gybed, then a second identical preventer line must have been rigged on the other, windward, side. Carefully, using the steering, the stern of the boat is brought up into the wind. Then the leeward, active preventer is released little by little, while the mainsheet is shortened to bring in the boom. It is important to maintain at least a turn or two around the preventer's cleat the whole time ready to catch an early gybe during this stage of the manoeuvre. Make the mainsheet pull the preventer around its cleat, do not offer it any slack. All the while it is also necessary to take in slack on the other, lazy preventer to keep it under control (i.e. prevent it getting tangled around something) until it is needed. Windward is the side of a boat into which the wind is blowing. ... For other meanings of the term, see Stern (disambiguation). ... Leeward is the side of a boat away from the direction where the wind is coming (i. ... This page is a candidate to be moved to Wiktionary. ...

As the boom gets as near as you can get it to midships (near to running fore-and-aft along the boat's centreline), slacken the active preventer, tighten the lazy one, make sure the mainsheet is very secure, check that all crew are safe from where the boom may swing, call "Gybe-ho" if you're feeling nautical, then make the slight steering adjustment that will actually gybe the sail. The course of the boat may slew further than you expect: That's good, ignore it, it gives you time to do the next three things.

Run out the mainsheet as fast as you can without burning your hand, check that the newly lazy preventer runs free, tighten in and secure the newly active one.

External links

Broaching is a sudden change in heading angle of a sailboat, caused by a number of wind/sail interactions. ... Capsizing refers to when a boat is inverted such that the bottom of the boat is on top. ... Points of sail is the term used to describe a sailing boats course in relation to the wind direction. ... Death roll is a term used by dinghy racing sailors to describe a capsize where the mast hits the water first with the boom and sail pointing outward, still catching the wind, causing the craft to rotate nose-first into the water. ... Gybe (also spelled jibe) is when a sailing boat (yacht) turns its stern through the wind, such that the wind changes from one side of the boat to the other. ... Heeling is the angular rotation or lean caused by the winds force on the sails of a sailing boat or a sailing ship. ... In sailing, hiking is the action of moving the sailors body weight as far to windward (upwind) as possible, in order to counteract the force of the wind pushing sideways against the boats sails. ... Points of sail is the term used to describe a sailing boats course in relation to the wind direction. ... A jibe (also spelled gybe) is when a sailing boat (yacht) turns its stern through the wind, such that the direction of the wind changes from one side of the boat to the other. ... A Musto Skiff, planing on a fast reach A planing boats hull skims across the surface of the water rather than pushing through the water in the way a traditional displacement hull works. ... Points of sail is the term used to describe a sailing boats course in relation to the wind direction. ... Points of sail is the term used to describe a sailing boats course in relation to the wind direction. ... To reef the main sail means to reduce its sail area. ... Tack is a term, that depending on its application has several different meanings. ... A jibe (also spelled gybe) is when a sailing boat (yacht) turns its stern through the wind, such that the direction of the wind changes from one side of the boat to the other. ...

Categories: Sailing manoeuvres | Sailing vessels and rigging A sail is any type of surface intended to generate thrust by being placed in a wind â€”in essence a vertically-oriented wing. ... This article is about the convenience store. ... This article is about the rigging of ships, and is based on the detailed article in the 1911 Encyclopedia Britannica, now in the public domain. ... In sailing, a course sail is the principal sail on a mast. ... A driver is a kind of sail used on some sailboats. ... In sailing, an extra is a sail that is not part of the working sail plan. ... A genoa (pronounced like the city, or as jenny) is a type of large jib-sail used on bermuda rigged craft, commonly the single-masted sloop and twin-masted yawl, less frequently on a ketch. ... A gennaker is a downwind sail that can be described as a cross between a genoa and a spinnaker. ... A jib is a triangular staysail set ahead of the foremost mast of a sailing boat. ... A lateen (from Latin) is a triangular sail set on a long yard mounted at an angle on the mast, and running in a fore-and-aft direction. ... A mainsail is the most important sail raised from the main (or only) mast of a sailing vessel. ... Also known as a skysail or moonraker. ... A spanker is either of two kinds of sail. ... A spinnaker is a special type of sail that is designed specifically for sailing downwind (with the wind behind the boat). ... A staysail is a fore-and-aft rigged sail whose luff is affixed to a stay running forward (and most often but not always downwards) from a mast to the deck, the bowsprit or to another mast. ... USS Monongahela with a full set of studding sails set A studding sail or studsail is a sail used to increase the sail area of a square rigged vessel in light winds. ... A spanker is either of two kinds of sail. ... On a square rigged sailing vessel, a topgallant sail is the square-rigged sail or sails immediately above the topsail or topsails. ... A topsail is a sail set above another sail; on square-rigged vessels further sails may be set above topsails. ... A small fore-and-aft sail hoisted abaft the foremast and mainmast in a storm to keep a ships bow to the wind. ... diagram showing the names of the parts of a sail The lower edge of a triangular sail is called the foot of the sail, while the upper point is known as the head. ... diagram showing the names of the parts of a sail The lower edge of a triangular sail is called the foot of the sail, while the upper point is known as the head. ... The term plastics covers a range of synthetic or semi-synthetic organic condensation or polymerization products that can be molded or extruded into objects or films or fibers. ... diagram showing the names of the parts of a sail The lower edge of a triangular sail is called the foot of the sail, while the upper point is known as the head. ... diagram showing the names of the parts of a sail The lower edge of a triangular sail is called the foot of the sail, while the upper point is known as the head. ... Kevlar (poly-paraphenylene terephthalamide) is the DuPont Companyâ€™s brand name for a synthetic material constructed of para-aramid fibers that the company claims is five times stronger than the same weight of steel, while being lightweight, flexible and comfortable. ... diagram showing the names of the parts of a sail The lower edge of a triangular sail is called the foot of the sail, while the upper point is known as the head. ... diagram showing the names of the parts of a sail The lower edge of a triangular sail is called the foot of the sail, while the upper point is known as the head. ... diagram showing the names of the parts of a sail The lower edge of a triangular sail is called the foot of the sail, while the upper point is known as the head. ... diagram showing the names of the parts of a sail The lower edge of a triangular sail is called the foot of the sail, while the upper point is known as the head. ... In sailing, a boom is a spar (pole) usually made of aluminum or wood, is connected to the foot of the mainsail and allows the crew to control the angle of the sail to the wind. ... Bowsprit of the Falls of Clyde, showing the dolphin striker, the use of chain for the bobstays, and three furled jibs. ... mizzen mast, mainmast and foremast Grand Turk The mast of a sailing ship is a tall vertical pole which supports the sails. ... In sailing, a gaff is the upper spar used to control a fore-and-aft sail set aft of the mast, such as a mainsail. ... mizzen mast, mainmast and foremast Grand Turk The mast of a sailing ship is a tall vertical pole which supports the sails. ... On sailing ships, the jury rig is a replacement mast and yards improvised in case of loss of the original mast. ... mizzen mast, mainmast and foremast Grand Turk The mast of a sailing ship is a tall vertical pole which supports the sails. ... mizzen mast, mainmast and foremast Grand Turk The mast of a sailing ship is a tall vertical pole which supports the sails. ... mizzen mast, mainmast and foremast Grand Turk The mast of a sailing ship is a tall vertical pole which supports the sails. ... The word truck is used in various different ways in different varieties of English. ... A spinnaker pole is a spar used in sailboats (both dinghys and yachts) to help support and control a variety of headsails, particularly the spinnaker. ... The fore royal yard on the Prince William. ... On a sailing vessel, a backstay is a piece of standing rigging which keeps a mast from falling forewards. ... In sailing, a block is a pulley or a number of pulleys enclosed in sheaves so as to be fixed to the end of a line or to a spar or surface. ... A boom vang is an item of rigging in a sail-powered vessel (usually small ones, but it is sometimes found on larger ones as well). ... The starboard main-brace and main-topsail-braces are clearly visible over the sea in this photo of the Prince Williams bridge and stern deck from her masthead. ... Clewlines and buntlines are lines used to handle the sails of a square rigged ship. ... link titleA clevis pin is a type of fastener that will allow rotation of the connected parts about the axis of the pin. ... Clewlines and buntlines are lines used to handle the sails of a square rigged ship. ... This article is about the sailing term. ... The downhaul is a line (or rope) which is part of the rigging on a sailboat; it applies downward force on a spar or sail. ... On a sailing vessel, a forestay is a piece of standing rigging which keeps a mast from falling backwards. ... A gasket holding the main-royal on a modern square-rigged training ship. ... Categories: Move to Wiktionary | Stub ... A guy is a term for a line (rope) attached to and intended to control the end of a spar on a sailboat. ... In sailing, a halyard is a line (rope) that is used to hoist (pull up) a sail or a yard to which a sail has been attached (bent on). ... This page is a candidate for speedy deletion. ... Anatomy In anatomy, the throat is the part of the neck anterior to the vertebral column. ... Ratlines, pronounced rattlins, are lengths of thin line tied between the shrouds of a sailing ship to form a ladder. ... Running rigging is the term for the rigging of a sailing vessel that is used for raising, lowering and controlling the sails - as opposed to the standing rigging, which supports the mast and other spars. ... A shackle is a U-shaped piece of metal secured with a pin or bolt across the opening, or a hinged metal loop secured with a quick-release locking pin mechanism. ... On a sailing boat, the standing rigging is that collection of lines which are fixed. ... In sailing, a sheet is a line attached to the clew of a sail, and is the main control used in trimming the sail. ... On a sailboat, the shrouds are pieces of standing rigging which hold the mast up from side to side. ... On a sailing ship, stay mouse refers to the bulge in a part of the standing rigging called a stay. ... Stays are the heavy ropes on sailing vessels that run from the masts to the hull. ... Anatomy In anatomy, the throat is the part of the neck anterior to the vertebral column. ... An acrobat below a balloon Trapeze artists, in lithograph by Calvert Litho. ...

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