Rigging (from Anglo-Saxon wrigan or wringing, "to clothe") is, on sailboats and sailing ships, the collection of apparatuses through which the force of the wind is transferred to the ship in order to propel it forward. This includes masts, yardarms, sails, and cordage.
Certain sail-plans are used for certain purposes according to their aerodynamic properties. All sailing vessels are classified according to their hull design and rigging.
Standing rigging is cordage which is fixed in position. Standing rigging is almost always between a mast and the deck, using tension to hold the mast firmly in place. Due to its role, standing rigging is now most commonly made of steel cable. It was historically made of the same materials as running rigging, only coated in tar for added strength and protection from the elements.
Running rigging is the cordage used to control the shape and position of the sails. Running rigging must be flexible in order to allow smooth movement of the spars and sails, but strong enough for the role it plays. For instance, a halyard, used to hoist heavy yards up and down, must be very strong and durable. On the other hand, a sheet, used to control the orientation of a triangular sail, must be very flexible and smooth, and need only be strong enough to support the tension caused by the wind.
Sails are fabric aerofoils designed to catch the wind and manipulate the air currents surrounding the vessel. They are attached to spars and rigging in various ways, such as metal clips, rope hoops, or in a luff-groove. Sails are usually rectangular or triangular in shape, which determines their use and placement. Rectangular sails attached to yards, and hanging perpendicular to the keel line are referred to as square sails, because they are "square" to the keel line (not because of their shape); and this type of sailplan is known as square-rigged. Sails hanging along the keel line at rest are known as "fore-and-aft" sails, and the sailplan as fore-and-aft rig; although when under way both square and fore-and-aft sails can fly at a variety of angles relative to the vessel. Fore-and-aft sails may be triangular (see Bermuda rig), or quadrilateral (see Gaff rig).
Sails are classified according to their shape and location. The name of a sail on a square-rigged vessel with multiple masts consists of the mast name and the sail's vertical position. On a three-masted vessel the masts are, from bow to stern, Fore, Main and Mizzen; the "plain" square sails are, bottom to top, Course, Topsail, Topgallant, Royal and Sky. Thus the sail second up the mizzen-mast is the "mizzen topsail", and the third sail up the fore-mast is the "fore topgallant sail". Sails set in other positions, or only in special circumstances, have a variety of other names, for instance: a triangular sail set on a stay might be called a staysail, or jib if the stay in question runs to the prow or bowsprit; sails set either side of square sails to increase sail area in light winds are called studding-sails, qualified by the side and the plain sail name (such as "port topgallant studding-sail", but more likely to be pronounced "port t'gallant stun'sl"); a gaff sail set aft of the mizzen mast may be called a Spanker or Driver.
On a modern fore-and-aft rigged boat the largest sail set on the main-mast is known as the mainsail, rather than main course. Sails set forward of the foremost mast are known generically as headsails, and might include jibs, genoas and spinnakers. Fore-and-aft rigged boats setting both a jib and staysail are known as Cutter rigged.
Masts are spars firmly attached to the deck of the ship. They are the main support for most sails, and all but the most speculative sailboats have at least one, generally set along the keel line. The classification of a mast is determined by its position, size and use.
Masts carrying rectangular or square sails have horizontal yards to stabilize the top and bottom edges of the sails. These yards can rotate around the mast, allowing the sails to be oriented horizontally, usually up to 45 degrees from perpendicular to the keel line. Some yards can be tilted vertically. Cordage associated with yards includes clew lines, bunt lines, the halyard, and lifts.
Masts carrying triangular sails have a horizontal boom to stabilize the foot of the sail. It is connected to the base of the mast at the gooseneck, a device designed to allow the boom to pivot about the mast. Cordage associated with booms includes the outhaul, the sheet, the boomvang, and the traveller.
Gaffs and battens are spars attached to the mast in a similar manner to the boom, but hinge vertically. Gaffs "joint" sails, allowing for two smaller sails (one above the gaff and one below) rather than one large, triangular sail. Battens are flexible gaffs included within the sail, and are found most notably in Chinese junks. Cordage associated with gaffs and battens includes halyards and the gunter line.
On large ships baggywrinkles protect the sail from chafing against the rigging.