Gaff rig

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Reliance, a competitor in the 1903 America's Cup and the largest gaff rigged cutter ever built Reliance Crossing Finish Line.jpg
Reliance, a competitor in the 1903 America's Cup and the largest gaff rigged cutter ever built
A gaff rigged sail and its surrounding spars Gaff rig spars.jpg
A gaff rigged sail and its surrounding spars
Gaff sail - 1Mast 2Gaff 3Peak 4Throat 5Boom 6Clew 7Tack 8Saddle 9Parrel 10Sall 11Bridle 12Peak Halyard 13Throat Halyard Gaff-sail-rigging-parts-nr.svg
Gaff sail - ①Mast ②Gaff ③Peak ④Throat ⑤Boom ⑥Clew ⑦Tack ⑧Saddle ⑨Parrel ⑩Sall ⑪Bridle ⑫Peak Halyard ⑬Throat Halyard

Gaff rig [1] is a sailing rig (configuration of sails, mast and stays) in which the sail is four-cornered, fore-and-aft rigged, controlled at its peak and, usually, its entire head by a spar (pole) called the gaff. Because of the size and shape of the sail, a gaff rig will have running backstays rather than permanent backstays.

Contents

The gaff enables a fore-and-aft sail to be four sided, rather than triangular. A gaff rig typically carries 25 percent more sail than an equivalent Bermuda rig for a given hull design. [2]

A sail hoisted from a gaff is called a gaff-rigged (or, less commonly, gaff rigged or gaffrigged) sail. [3]

Description

Gaff rig remains the most popular fore-aft rig for schooner and barquentine mainsails[ citation needed ] and other course sails, and spanker sails on a square rigged vessel are always gaff rigged. On other rigs, particularly the sloop, ketch and yawl, gaff rigged sails were once common but have now been largely replaced by the Bermuda rig sail, [4] which, in addition to being simpler than the gaff rig, usually allows vessels to sail closer to the direction from which the wind is blowing (i.e. "closer to the wind").[ citation needed ]

The gaff is hoisted by two halyards:

Halyards (and edges) on a gaff rigged sail Mainsail-edges.png
Halyards (and edges) on a gaff rigged sail
The gaff-rigged schooner Rose Dorothea won the 1907 Lipton's Cup, despite a broken foretopmast (pictured) Rose Dorothea-1907-broke topmast racing-won Lipton Cup.jpg
The gaff-rigged schooner Rose Dorothea won the 1907 Lipton's Cup, despite a broken foretopmast (pictured)

Additionally, a gaff vang may be fitted. It is a line attached to the end of the gaff which prevents the gaff from sagging downwind. Gaff vangs are difficult to rig on the aft-most sail, so are typically only found on schooners or ketches, and then only on the foresail or mainsail.[ citation needed ]

A triangular fore-and-aft sail called a jib-headed topsail may be carried between the gaff and the mast. [7]

Gunter-rigged boats are similar, smaller vessels on which a spar (commonly, but incorrectly called the gaff) is raised until it is nearly vertical, parallel to the mast and close adjacent to it. Topsails are never carried on gunter rigs.

The spritsail is another rig with a four-sided fore-aft sail. Unlike the gaff rig where the head hangs from a spar along its edge, this rig supports the leech of the sail by means of a spar named a sprit. The forward end of the sprit is attached to the mast but bisects the face of the sail, with the after end of the sprit attaching to the peak and/or the clew of the sail.

Sailing characteristics (small craft)

For a given sail area a gaff rig has a shorter mast than a Bermudan rig. In short-ended craft with full body, heavy displacement and moderate ballast ratio, it is difficult to set enough sail area in the Bermudan rig without a mast of excessive height and a centre of effort (CE) too high for the limited stability of the hull. [8] Because of its low aspect ratio, the gaff rig is less prone to stalling if oversheeted than something taller and narrower. [9]

Reaching with gaff sails

Whilst reaching, the CE being set further back, will encourage a small craft to bear up into the wind, i.e. strong weather helm. The boat builder can compensate for this at design stage, e.g. by shifting the keel slightly aft, or having two jibs to counter the effect. The gaff-cutter is in fact a very popular sailplan for small craft.[ citation needed ] The helmsman can reduce weather helm significantly, simply by sheeting out the mainsail. Sheeting out may appear to create an inefficient belly in the sail, but it is often a pragmatic alternative to having a heavy helm. A swing keel lifted halfway is the perfect treatment for weather helm on a gaffer.[ citation needed ] The usual adjustments to mast rake, or even bowsprit length may be made to a gaffer with persistent heavy weather (or lee) helm.

Running with gaff sails

On a gaff-rigged vessel, any heading where the wind is within 20 degrees of dead aft is considered a run. [10] When running with a gaff rig, the CE of the mainsail may actually be overboard of the hull, in a stiff wind the craft may want to broach. Running goose winged with a balloon staysail poled out to windward will balance the CE; Nick Skeates circumnavigated Wylo II with this configuration. [11] In light winds, or when racing, a watersail may also be set.

Gaffers Day

Since 1972, the Sydney Amateur Sailing Club has regularly hosted a Gaffers Day for any classic sailing boat that can "hoist a spar". Up to 90 vessels from around Australia take part in sailing on Sydney Harbour in a practical demonstration of the skills and technology used in the nautical past. [12]

See also

Related Research Articles

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<span class="mw-page-title-main">Schooner</span> Sailing vessel

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<span class="mw-page-title-main">Rig (sailing)</span> Arrangement of a ships masts, sails, and ropes

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<span class="mw-page-title-main">Jibe</span> Basic sailing maneuver, where ship turns its stern through the wind

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A topsail ("tops'l") is a sail set above another sail; on square-rigged vessels further sails may be set above topsails.

<span class="mw-page-title-main">Mainsail</span> Sail rigged to the main mast of a sailing vessel

A mainsail is a sail rigged on the main mast of a sailing vessel.

<span class="mw-page-title-main">Cutter (boat)</span> Type of boat

A cutter is a name for various types of watercraft. It can apply to the rig of a sailing vessel, to a governmental enforcement agency vessel, to a type of ship's boat which can be used under sail or oars, or, historically, to a type of fast-sailing vessel introduced in the 18th century, some of which were used as small warships.

<span class="mw-page-title-main">Running rigging</span> Lines that control sails

Running rigging is the rigging of a sailing vessel that is used for raising, lowering, shaping and controlling the sails on a sailing vessel—as opposed to the standing rigging, which supports the mast and bowsprit. Running rigging varies between vessels that are rigged fore and aft and those that are square-rigged.

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<span class="mw-page-title-main">Bermuda rig</span> Configuration of mast and rigging for a type of sailboat

A Bermuda rig, Bermudian rig, or Marconi rig is a configuration of mast and rigging for a type of sailboat and is the typical configuration for most modern sailboats. This configuration was developed in Bermuda in the 17th century; the term Marconi, a reference to the inventor of the radio, Guglielmo Marconi, became associated with this configuration in the early 20th century, because the wires that stabilize the mast of a Bermuda rig reminded observers of the wires on early radio masts.

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<span class="mw-page-title-main">Gunter rig</span> Fore and aft sailing rig with nearly vertical upper spar

Gunter rig is a configuration of sail and spars used in sailing. It is a fore and aft sail set abaft (behind) the mast. The lower half of the luff (front) of the sail is attached to the mast, and the upper half is fastened to a spar which is approximately vertical and reaches above the top of the mast. This spar is called a "yard", but it is common for some to confuse it with a "gaff". The overall shape of a gunter sail is roughly triangular, so having a superficial resemblance to Bermuda rig.

<span class="mw-page-title-main">Spritsail</span>

The spritsail is a four-sided, fore-and-aft sail that is supported at its highest points by the mast and a diagonally running spar known as the sprit. The foot of the sail can be stretched by a boom or held loose-footed just by its sheets. A spritsail has four corners: the throat, peak, clew, and tack. The Spritsail can also be used to describe a rig that uses a spritsail.

<span class="mw-page-title-main">Pinisi</span> Type of rigging of Indonesian sailing vessels

Literally, the word pinisi refers to a type of rigging of Indonesian sailing vessels. A pinisi carries seven to eight sails on two masts, arranged like a gaff-ketch with what is called 'standing gaffs' — i.e., unlike most Western ships using such a rig, the two main sails are not opened by raising the spars they are attached to, but the sails are 'pulled out' like curtains along the gaffs which are fixed at around the centre of the masts.

<i>Pinas</i> (ship) Pinis

The pinas, sometimes called "pinis" as well, is a type of schooner of the east coast of the Malay peninsula, built in the Terengganu area. This kind of vessel was built of Chengal wood by the Malays since the 19th century and roamed the South China Sea and adjacent oceans as one of the two types of traditional sailing vessels the late Malay maritime culture has developed: The bedar and the pinas.

<span class="mw-page-title-main">Sail</span> Fabric or other surface supported by a mast to allow wind propulsion

A sail is a tensile structure, which is made from fabric or other membrane materials, that uses wind power to propel sailing craft, including sailing ships, sailboats, windsurfers, ice boats, and even sail-powered land vehicles. Sails may be made from a combination of woven materials—including canvas or polyester cloth, laminated membranes or bonded filaments, usually in a three- or four-sided shape.

The following outline is provided as an overview of and topical guide to sailing:

<span class="mw-page-title-main">Sail plan</span> Technical drawing of a sailing craft

A sail plan is a drawing of a sailing craft, 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 craft. A sailing craft may be waterborne, an iceboat, or a sail-powered land vehicle.

References

  1. "The Gaff Rig Page". Archived from the original on December 3, 2008. Retrieved 2008-10-05.
  2. Philips-Birt, Douglas (1954). Rigs and Rigging of Yachts. W&J Mackay & Co. Ltd. p. 176.
  3. "N-gram comparison of 'gaff-rigged', 'gaff rigged', 'gaffrigged', 1900–2008". Google books Ngram Viewer. Google Inc. Retrieved 17 February 2013.
  4. Cunliffe, Tom (1992). Hand, Reef and Steer. London: Adlard Coles Nautical. p. 12.
  5. Leather, John (2001). The Gaff Rig Handbook: History, Design, Techniques, Developments (2nd ed.). WoodenBoat Books. p. 32. ISBN   978-0-937822-67-8.
  6. Leather (2001), p. 33.
  7. Leather (2001), p. 54.
  8. Philips-Birt (1954), pp. 47–48.
  9. Cunliffe (1992), p. 15.
  10. Cunliffe (1992), p. 118.
  11. Cunliffe (1992), p. 120.
  12. "Gaffers Day".

Further reading