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A secondary machine, system or service that supports a vessel’s primary operation. On a sailing vessel, “the auxiliary” commonly means an engine providing propulsion when sails are unsuitable or additional control is needed. On other vessels, auxiliary machinery includes generators, pumps, compressors, thrusters and systems serving functions other than the main propulsion plant. Auxiliary does…
A short inner forestay that supports the forward part of a sailing vessel’s mast. A baby stay normally runs from a point on the forward face of the mast to a fitting on the foredeck, aft of the main forestay. It helps control mast bend and supports the lower or middle section of the mast…
Standing rigging leading aft from a mast to support it against forward loads. A permanent backstay commonly leads from or near the masthead to the stern area. On some rigs its tension can be adjusted to control forestay tension and mast bend, affecting headsail shape and mainsail trim. Not every sailing rig has a fixed…
To remove water from inside a boat using a bucket, scoop or similar container. Bailing is common in dinghies, tenders and open boats after rain, spray, a capsize or water shipped over the side. A hand bailer may also supplement a pump or self-bailer when water accumulates faster than the installed system removes it. Removing…
A container or fitted device used to remove water from a boat. A hand bailer may be a purpose-made scoop, bucket or other suitable container. Some small craft also have self-bailers that use the boat’s movement through the water to drain water from the hull. A manual bailer remains useful when pumps or automatic drainage…
Weight carried or built into a vessel to improve stability, trim or draught. Ballast may be fixed, as in a sailing yacht’s keel, or variable, such as water held in ballast tanks. Its position is as important as its mass: low ballast generally increases resistance to heeling, while poorly positioned or shifting weight can adversely…
A platform at or near the stern that provides access between a vessel and the water. It may be moulded into the hull, fixed externally, folded or lowered hydraulically. A ladder, handhold, non-slip surface or tender-handling fittings may be incorporated, but the precise arrangement and permissible loads depend on the vessel. People using the platform…
A thin, stiff strip fitted to a sail to support its shape and control the leech. Battens slide into pockets in the sail and resist unwanted folding and flutter. Short battens support the leech, while full-length battens extend from leech towards or to the luff and distribute loads across a larger part of the sail….
A reinforced sleeve or enclosure in a sail that retains a sail batten. The pocket positions the batten so it supports the sail’s designed shape, controls the leech and reduces flutter. Pockets may hold short or full-length battens and can include adjustable end fittings that set batten compression. The pocket end, stitching and closure carry…
The maximum width of a vessel, measured across the hull at the stated reference level. Beam is a principal dimension, but published figures may refer to moulded beam, extreme beam or another defined measurement and can include or exclude projections. The widest point is not necessarily at the vessel’s longitudinal midpoint. Beam influences space, resistance…
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