A jibboom (also spelt jib-boom) is a

spar SPAR, originally DESPAR, styled as DE SPAR, is a Dutch multinational that provides branding, supplies and support services for independently owned and operated food retail stores. It was founded in the Netherlands in 1932, by Adriaan van Well, ...

used to extend the length of a

bowsprit The bowsprit of a sailing vessel is a spar extending forward from the vessel's prow. The bowsprit is typically held down by a bobstay A bobstay is a part of the rigging of a sailing boat or ship. Its purpose is to counteract the upward tensio ...

sailing ship A sailing ship is a sea-going vessel that uses sails mounted on masts to harness the power of wind and propel the vessel. There is a variety of sail plans that propel sailing ships, employing square-rigged or fore-and-aft sails. Some ships ...

s. It can itself be extended further by a flying jib-boom. The heel (i.e. rear and lower) end of the flying jib-boom is attached to the jib-boom, and the heel of the jib-boom to the bowsprit. The point (i.e. higher and fore end) of the flying jib-boom is generally the fore-most extent of a ship. The jib- and flying jib- booms carry the

tack TACK is a group of archaea acronym for Thaumarchaeota (now Nitrososphaerota), Aigarchaeota, Crenarchaeota (now Thermoproteota), and Korarchaeota, the first groups discovered. They are found in different environments ranging from acidophilic ...

s of the jib and

flying jib A jib is a triangular sail that sets ahead of the foremast of a sailing vessel. Its tack is fixed to the bowsprit, to the bows, or to the deck between the bowsprit and the foremost mast. Jibs and spinnakers are the two main types of headsail ...

sails, respectively, and the

stay Stay may refer to: Places * Stay, Kentucky, an unincorporated community in the US Law * Stay of execution, a ruling to temporarily suspend the enforcement of a court judgment * Stay of proceedings, a ruling halting further legal process in a tri ...

for the fore topgallant mast and the royal stay.

Jib-boom

The jib-boom is—as the name suggests—the

boom Boom may refer to: Objects * Boom (containment), a temporary floating barrier used to contain an oil spill * Boom (navigational barrier), an obstacle used to control or block marine navigation * Boom (sailing), a sailboat part * Boom (windsurfin ...

for the jib, extending its foot. On smaller, merchant, sailing ships, it is commonly attached to the bowsprit by a cap and a saddle, either lashed down or secured with a crupper chain. Alternatively, it can be attached by a boom iron and a cap, or even by two boom irons. The cap and saddle allow it to be withdrawn aft along the bowsprit as a ship enters harbour, reducing the opportunity for passing ships to glance against it and snap it off from the bowsprit. It is octagonal in cross-section at its heel end. If secured by a chain to the bowsprit, it is iron-scored at the heel. At its point it is also (partly) octagonal in cross-section, the same as is the boom iron that secures the flying jib-boom to it. The flying jib-boom lies against the upper starboard side of the octagon. The stay of the fore topgallant mast is attached to the jib-boom at the extremity of its point. The stay for the jib sail is attached to the shouldering at its heel. Just as the bowsprit has

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,martingale hangs down from the point of the jib-boom to a

dolphin striker 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 forw ...

, pulling downwards on the jib-boom.

Flying jib-boom

The flying jib-boom is secured, at its heel end, to the jib-boom by a boom iron and lashing. At its point, it has a

sheave A sheave () or pulley wheel is a grooved wheel often used for holding a belt, wire rope, or rope and incorporated into a pulley A pulley is a wheel on an axle or shaft that is designed to support movement and change of direction of a ...

for the royal stay. Another sheave at the heel is for a heel rope. It is to the point that the tack of the flying jib sail is drawn out.

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Jib-boom

Flying jib-boom

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Further reading