A jibboom (also spelled jib-boom) is a spar used to extend the length of a

bowsprit The bowsprit of a sailing vessel is a spar (sailing), spar extending forward from the vessel's prow. The bowsprit is typically held down by a bobstay that counteracts the forces from the forestay, forestays. The bowsprit’s purpose is to create ...

sailing ship A sailing ship is a sea-going vessel that uses sails mounted on Mast (sailing), masts to harness the power of wind and propel the vessel. There is a variety of sail plans that propel sailing ships, employing Square rig, square-rigged or Fore-an ...

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 Thermoproteati is a kingdom of archaea. Its synonym, "TACK", is an acronym for Thaumarchaeota (now Nitrososphaerota), Aigarchaeota, Crenarchaeota (now Thermoproteota), and Korarchaeota (now Thermoproteota), the first groups discovered. They ...

s of the

jib A jib is a triangular sail that sets ahead of the foremast of a sailing vessel. Its forward corner (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 ty ...

and

flying jib A jib is a triangular sail that sets ahead of the foremast of a sailing vessel. Its forward corner ( 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 mai ...

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 tr ...

for the fore topgallant mast and the royal stay. In yachts it is a boom attached to the foot of the jib, to keep the shape of the sail in different wind angles and to allow self tacking.

Jib-boom

The jib-boom is—as the name suggests—the boom 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 bobstays, in order to counteract the upward force from the jib and fore topgallant stays a 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 for ...

, 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 Sheave without a rope A pulley is a wheel on an axle or shaft enabling a taut cable or belt passing over the wheel to move and change direction, or transfer power between itself and a shaft. A pulley may have a groove or grooves between flan ...

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