Dolphin striker

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Schematic view of the bow of a ship, showing: A the martingale stay, B the dolphin striker and C the bobstay. Martingale dolphinStiker bobstay.png
Schematic view of the bow of a ship, showing: A the martingale stay, B the dolphin striker and C the bobstay .

A dolphin striker (an older term for a martingale boom or simply a martingale; sometimes called a striker) is a small vertical or near vertical ancillary spar spanning between the bowsprit and martingale thereby redirecting the tension in the forward end of the martingale slightly more vertically. This vertical component is necessary to more effectively oppose the forestays' mostly upward tension on the forward end of the bowsprit than would be the case in the absence of the dolphin striker. [1]

Around 1813 some large sailing vessels experimented with double strikers: these had two downward-pointing spars forming an inverted V in the middle of the bowsprit. However, the practice was short-lived as it did not seem to provide any additional benefit. The dolphin striker's length was typically half the length of the spritsail yard or, when spreaders were used, the same length as one spreader. [2]

On a catamaran such as the Hobie 16 and the Tornado where the mast is stepped on a beam between the hulls the dolphin striker provides support for the beam in order to support the mast load. [3]

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Sail plan Diagram of the masts, spars, rigging, and sails of a sailing vessel

A sail plan is a description of the specific ways that a sailing craft is rigged. Also, the term "sail plan" is a graphic depiction of the arrangement of the sails for a given sailing craft.

Boat building Design and construction of floating vessels

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Cutter (boat) Type of boat

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Running rigging Lines that control sails

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This is a glossary of nautical terms; some remain current, while many date from the 17th to 19th centuries. See also Wiktionary's nautical terms, Category:Nautical terms, and Nautical metaphors in English. See the Further reading section for additional words and references.

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Stays (nautical)

Stays are ropes, wires, or rods on sailing vessels that run fore-and-aft along the centerline from the masts to the hull, deck, bowsprit, or to other masts which serve to stabilize the masts.

Boom (sailing) In sailing, a spar along the bottom edge of a fore and aft rigged sail

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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.

A mast-aft rig is a sailboat sail-plan that uses a single mast set in the aft half of the hull. The mast supports fore-sails that may consist of a single jib, multiple staysails, or a crab claw sail. The mainsail is either small or completely absent. Mast-aft rigs are uncommon, but are found on a few custom, and production sailboats.

Spritsail (square-rigged)

On large sailing ships a spritsail is a square-rigged sail carried on a yard below the bowsprit. One of the earliest depictions of a spritsail is carved on Borobudur ship carving in Borobudur temple, Indonesia.

Jibboom

A jibboom is a spar used to extend the length of a bowsprit on sailing ships. It can itself be extended further by a flying jib-boom. The heel end of the flying jib-boom is attached to the jib-boom, and the heel of the jib-boom to the bowsprit. The point of the flying jib-boom is generally the fore-most extent of a ship. The jib- and flying jib- booms carry the tacks of the jib and flying jib sails, respectively, and the stay for the fore topgallant mast and the royal stay.

Sail Fabric or other surface supported by a mast to allow wind propulsion

A sail is a tensile structure—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.

Bobstay

A bobstay is a part of the rigging of a sailing boat or ship. Its purpose is to counteract the upward tension on the bowsprit from the jibs and forestay. A bobstay may run directly from the stem to the bowsprit, or it may run to a dolphin striker, a spar projecting downward, which is then held to the bowsprit or jibboom by a martingale stay.

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

References

  1. "Dictionary of Wisconsin History – Term: dolphin striker (maritime)". Wisconsin Historical Society . Retrieved 10 January 2010. A short spar perpendicular the bowsprit, used with martingales for holding down the jib-boom. The position is such that a dolphin leaping at the bow of a vessel could possibly be struck by this spar.
  2. Lees, James (1984). The Masting and Rigging of English Ships of War, 1625–1860 (Second ed.). Naval Institute. p. 32. ISBN   9780870219481.
  3. "Rules and Restrictions Imposed on Cobra 5 Metre Catamarans as amended to January 1996" (PDF). Australian Cobra Catamaran Association. January 1996. p. 3. Retrieved 10 January 2010.

Further reading