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  2. Propeller theory - Wikipedia

    en.wikipedia.org/wiki/Propeller_theory

    The momentum theory or disk actuator theory – a theory describing a mathematical model of an ideal propeller – was developed by W.J.M. Rankine (1865), Alfred George Greenhill (1888) and Robert Edmund Froude (1889). The propeller is modelled as an infinitely thin disc, inducing a constant velocity along the axis of rotation.

  3. Chine (boating) - Wikipedia

    en.wikipedia.org/wiki/Chine_(boating)

    A chine in boat design is a sharp change in angle in the cross section of a hull. The chine typically arises from the use of sheet materials (such as sheet metal or marine ply) as the mode of construction.

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

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

    Glossary of nautical terms (A–L) This glossary of nautical terms is an alphabetical listing of terms and expressions connected with ships, shipping, seamanship and navigation on water (mostly though not necessarily on the sea). Some remain current, while many date from the 17th to 19th centuries.

  5. Displacement (ship) - Wikipedia

    en.wikipedia.org/wiki/Displacement_(ship)

    The ship's hydrostatic tables show the corresponding volume displaced. To calculate the weight of the displaced water, it is necessary to know its density. Seawater (1,025 kg/m 3 ) is more dense than fresh water (1,000 kg/m 3 ); [5] so a ship will ride higher in salt water than in fresh.

  6. Boat building - Wikipedia

    en.wikipedia.org/wiki/Boat_building

    Boat building is the design and construction of boats (instead of the larger ships) — and their on-board systems. This includes at minimum the construction of a hull, with any necessary propulsion, mechanical, navigation, safety and other service systems as the craft requires.

  7. 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 ...