The central portion of a propeller to which the blades are attached and through which the shaft end passes.

A small compartment in which tools and small stuff for repairing cargo gear are kept.

Bottom ash is part of the non-combustible residue of combustion in a power plant, boiler, furnace or incinerator.

The shell envelope plating forming the predominantly flat bottom portion of the shell envelope including the keel plate.

A narrow layer of moving water adjacent to the hull of a ship as it moves through the water.

The structural arrangement and form of the forward end of the ship.

A device mounted on tanker forecastle deck for securing a chafe chain. Ships likely to trade to Single Point Moorings should be equipped with bow chain stoppers designed to accept 76 mm chafe chain.

Shuttle tanker can be provided with the bow control house, where all navigation and machinery controls are doubled. During all stages of the offshore loading operation a shuttle tanker is controlled from this position.

A watertight part of the ship forebody that can be opened to provide clear access to the bow ramp. Bow doors are used on ro-ro ferries to enable handling of freight on drive-through basis;

The spreading out of the forebody form from the central vertical plane with increasing rapidity as it rises from the waterline to the rail. Ships with an excessive bow flare are exposed to much higher sea loads than previously expected.

A guidance tool developed on the basis of seakeeping model test results. BFE at a station x = X/Lbp tan@, x = distance from midships, @ = the smallest angle of flare against waterplane at the station.

A system of loading used on shuttle tankers to transfer crude oil from FPSO.

Ships which are required to go astern for long distances are provided with flap rudder integrated into the bow. See also Rotary bow rudder system.

Heavy impact resulting from a vessel forward bottom making sudden contact with the sea surface after having risen on a wave.

The Bow Steering Module (BSM) is a pusher assistance boat driven by two Voith Schneider® Propellers. Its main function is to generate steering forces at various points on the group of vessels being pushed, preferably at the bow...

A lateral thruster fitted in an athwartships tunnel near the bow to improve manoeuvrability. When the bow thruster is used while the vessel is moving forward the thrust is partially counteracted by a vacuum...

A solar bowl is a type of solar thermal collector that operates similarly to a parabolic dish, but instead of using a tracking parabolic mirror with a fixed receiver, it has a fixed spherical mirror with a tracking receiver.

A hollow girder or beam with a square or rectangular cross section.

Boxcooler is tube-type heat exchanger invented and built in the Netherlands. The first boxcoolers were used for river vessels.

Boyle's law, also referred to as the Boyle–Mariotte law, or Mariotte's law (especially in France), is an experimental gas law that describes how the pressure of a gas tends to increase as the volume of the container decreases.