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  2. Fillet (heraldry) - Wikipedia

    en.wikipedia.org/wiki/Fillet_(heraldry)

    Fillet (heraldry) In English-language heraldry, the fillet is considered a diminutive of the chief. It is defined as occupying one fourth the width of the chief and typically positioned at its bottom edge. [1] When so positioned the chief is blazoned as supported by the fillet; but, when the chief is charged by the fillet, as when the fillet ...

  3. Type 093 submarine - Wikipedia

    en.wikipedia.org/wiki/Type_093_submarine

    These boats have a streamlined sail lengthened by 2.5 meters to reach the Type 093's design speed of 30 knots, a stern towed array sonar deployment tube, and a hump behind the sail; the hump is likely for the towed array handling gear and is not a vertical launching system (VLS). The hump was box-like on the first boat, tall and streamlined on ...

  4. Glossary of nautical terms (A–L) - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_nautical_terms...

    A AAW An acronym for anti-aircraft warfare. aback (of a sail) Filled by the wind on the opposite side to the one normally used to move the vessel forward.On a square-rigged ship, any of the square sails can be braced round to be aback, the purpose of which may be to reduce speed (such as when a ship-of-the-line is keeping station with others), to heave to, or to assist moving the ship's head ...

  5. Stitch and glue - Wikipedia

    en.wikipedia.org/wiki/Stitch_and_glue

    Stitch and glue is a simple boat building method which uses plywood panels temporarily stitched together, typically with wire or zip-ties, and glued together permanently with epoxy resin. This type of construction can eliminate much of the need for frames or ribs. [1] Plywood panels are cut to shape and stitched together to form an accurate ...

  6. Factory ship - Wikipedia

    en.wikipedia.org/wiki/Factory_ship

    The basic idea of a mother ship is that it can carry small fishing boats that return to the mother ship with their catch. But the idea extends to include factory trawlers supporting a fleet of smaller catching vessels that are not carried on board. They serve as the main ship in a fleet operating in waters a great distance from their home ports.

  7. Propeller theory - Wikipedia

    en.wikipedia.org/wiki/Propeller_theory

    A propeller imparts momentum to a fluid which causes a force to act on the ship. The ideal efficiency of any propulsor is that of an actuator disc in an ideal fluid. This is called the Froude efficiency and is a natural limit which cannot be exceeded by any device, no matter how good it is.