Sailing rigs describe the arrangement of sailing vessels' rig components, including their spars, rigging, and sails. Examples include a schooner rig, cutter rig, junk rig, etc. Rigs may be broadly categorized as fore-and-aft and square-rigged. They may incorporate a mixture of both categories. Within the fore-and-aft category there is a variety of triangular and quadrilateral sail shapes. Spars or battens may be used to help shape a given kind of sail. Each rig may be described with a sail plan—formally, a drawing of a vessel, viewed from the side.
Modern examples of single-person sailing craft, such as windsurfers, iceboats, and land-sailing craft, typically have uncomplicated rigs with a single sail on a mast with a boom.
In the English language, ships were usually described, until the end of the eighteenth century, in terms of their type of hull design. Using the type of rig as the main type identifer for a vessel became common only in the nineteenth century.: 29 This is illustrated by the terminology for ships in the large fleet of colliers that traded to London from the coal ports of the Northeast of England (of which HMS Endeavour was a well-known example). Many of these full-rigged ships (square rigged on all of three masts) had the hull type "bark" – another common classification was "cat". In the second half of the eighteenth century, the square sails on the mizzen were often eliminated. The resulting rig acquired the name of the hull type: initially as "bark" and soon as "barque". This explains the Royal Navy's description of Endeavour as a "cat-built bark".: 51, 57-61
A well-designed sail plan should be balanced, requiring only light forces on the helm to keep the sailing craft on course. The fore-and-aft center of effort on a sail plan is usually slightly behind the center of resistance of the hull,[a] so that the sailing craft will tend to turn into the wind if the helm is unattended. The height of the sail plan's center of effort above the surface is limited by the sailing craft's ability to avoid capsize, which is a function of its hull shape, ballast, or hull spacing (in the case of catamarans and trimarans).
Each form of rig requires its own type of sails. Among them are:
Ships that sailed from Europe and the Americas could be categorized in a variety of ways, by number of masts and by sailing rig.
Single-masted sailing vessels include the catboat, cutter and sloop. Two-masted vessels include the bilander, brig, brigantine, ketch, schooner, snow, and yawl. Three-masted vessels include the barque, barquentine, polacre and full-rigged ship. Luggers could have one or two masts and schooners could have two or more masts.
A three-masted vessel has, from front to back, a foremast, mainmast and mizzenmast. A two-masted vessel has a mainmast, the other being a foremast or mizzen. Ships with more than three masts may simply number them or use another scheme, as with the five-masted Preussen.
On a square-sailed vessel, the sails of each mast are named by the mast and position on the mast. For instance, on the mainmast (from bottom to top):
On many ships, sails above the top (a platform just above the lowest sail on the fore, main and mizzens masts) were mounted on separate mast segments—"topmasts" or "topgallant masts"—held in wooden sockets called "trestletrees". These masts and their stays could be rigged or struck as the weather conditions required, or for maintenance and repair.
In light breezes, the working square sails would be supplemented by studding sails ("stuns'l") out on the ends of the yardarms. These were called as a regular sail, with the addition of "studding". For example, the main top studding sail.
Between the main mast and mizzen as well as between main mast and foremast, the staysails between the masts are named from the sail immediately below the highest attachment point of the stay holding up that staysail. Thus, the mizzen topgallant staysail can be found dangling from the stay leading from above the mizzen (third) mast's topgallant sail (i.e., from the mizzen topgallant yard) to at least one and usually two sails down from that on the main mast (the slope of the top edge of all staysail lines runs from a higher point nearer the stern to a lower point towards the bow).
The jibs (the staysails between the foremast and the bowsprit) are named (from inner to outer most) fore topmast staysail (or foretop stay), inner jib, outer jib and flying jib. Many of the jibs' stays meet the foremast just above the fore topgallant. A fore royal staysail may also be set.
See also: Austronesian vessels and Proa
Austronesian sailing rigs, include vessels with crab-claw and tanja sails. The seafaring Austronesian peoples independently developed various sail types during the Neolithic, beginning with the crab claw sail (also misleadingly called the "oceanic lateen" or the "oceanic sprit") at around 1500 BCE. They are used throughout the range of the Austronesian Expansion, from Maritime Southeast Asia, to Micronesia, Island Melanesia, Polynesia, and Madagascar. Crab claw sails are rigged fore-and-aft and can be tilted and rotated relative to the wind. They evolved from "V"-shaped perpendicular square sails in which the two spars converge at the base of the hull. The simplest form of the crab claw sail (also with the widest distribution) is composed of a triangular sail supported by two light spars (sometimes erroneously called "sprits") on each side. They were originally mastless, and the entire assembly was taken down when the sails were lowered.
The proa is a single-outrigger Austronesian boat with one sail. Both ends are alike, and the boat is sailed in either direction, but it has a fixed leeward side and a windward side. The boat is shunted from beam reach to beam reach to change direction, with the wind over the side, a low-force procedure. The bottom corner of the crabclaw sail is moved to the other end, which becomes the bow as the boat sets off back the way it came. The mast usually hinges, adjusting the rake or angle of the mast. The proa is a low-stress rig, which can be built with simple tools and low-tech materials, but it is extremely fast. On a beam reach, it may be the fastest simple rig.
Junk rigs were in use in China by around the 12th century. Iconographic remains show that Chinese ships before the 12th century used square sails.: 456–457, plate CDIII–CDVI
In its most traditional form the junk rig is carried on an unstayed mast (i.e. a mast without shrouds or stays, supported only on the step at the keelson and the partners); however, standing rigging of some kind is not uncommon. It is typical to run the halyards (lines used to raise and lower the sail) and sheets (lines used to trim the sail) to the companionway on a junk-rigged boat. This means that typical sailhandling can be performed from the relative safety of the cockpit, or even while the crew is below deck.
Junk sails are typically carried on a mast which rakes (slants) forward a few degrees from vertical. The forward rake of the sail encourages the sail to swing out, which makes the use of a preventer unnecessary. Another way to say this is that the sail is stable when swung out and doesn't return to the middle of the ship when the wind drops.
Presented alphabetically by section:
With square sails on every mast
With some masts having exclusively fore-and-aft sails
Each rig may be described with a sail plan—a drawing of a vessel, viewed from the side, depicting its sails, the spars that carry them and some of the rigging that supports the rig. By extension, "sail plan" describes the arrangement of sails on a vessel.