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  2. Volmer VJ-22 Sportsman - Wikipedia

    en.wikipedia.org/wiki/Volmer_VJ-22_Sportsman

    The VJ-22 is a high-winged monoplane, using the wings from an Aeronca Champion or Chief, with a new flying boat hull of mahogany plywood, waterproofed with fiberglass cloth. [3] The aircraft's single engine, normally a pusher of between 85 hp (63 kW) and 100 hp (75 kW), is mounted on pylons above the wing centre section.

  3. Solutions for cavitation in marine propellers - Wikipedia

    en.wikipedia.org/wiki/Solutions_for_Cavitation...

    In order to reduce the possibility of cavitation happening in marine propellers, a set of nozzles are placed on the hull of the ship directly in front of the propeller. These nozzles spray out compressed air over the propeller that creates "a macro bubble". [ 1] This bubble completely encompasses the propeller that is in operation.

  4. Copper sheathing - Wikipedia

    en.wikipedia.org/wiki/Copper_sheathing

    The metal sheathing of Cutty Sark, made from the copper alloy Muntz metal. Copper sheathing is a method for protecting the hull of a wooden vessel from attack by shipworm, barnacles and other marine growth through the use of copper plates affixed to the surface of the hull, below the waterline. It was pioneered and developed by the Royal Navy ...

  5. Ship stability - Wikipedia

    en.wikipedia.org/wiki/Ship_stability

    Ship stability. Ship stability is an area of naval architecture and ship design that deals with how a ship behaves at sea, both in still water and in waves, whether intact or damaged. Stability calculations focus on centers of gravity, centers of buoyancy, the metacenters of vessels, and on how these interact.

  6. Sponson - Wikipedia

    en.wikipedia.org/wiki/Sponson

    Watercraft. On watercraft, a sponson is a projection that extends outward (usually from the hull, but sometimes other parts of the vessel) to improve stability while floating, or to act as a securing point for other equipment. Vessels with unstable body shapes or unevenly distributed weight are likely to feature sponsons to help prevent ...

  7. Hogging and sagging - Wikipedia

    en.wikipedia.org/wiki/Hogging_and_sagging

    Hogging is the stress a ship's hull or keel experiences that causes the center or the keel to bend upward. Sagging is the stress a ship's hull or keel is placed under when a wave is the same length as the ship and the ship is in the trough of two waves. This causes the middle of the ship to bend down slightly, and depending on the level of bend ...

  8. Ship ballast - Wikipedia

    en.wikipedia.org/wiki/Ship_ballast

    Ship ballast. Ballast is extra weight placed low in ships to lower their centre of gravity, which increases stability (more technically, to provide moment to resist the lateral forces on the hull). Insufficiently ballasted boats tend to tip or heel excessively in high winds. Too much heel may result in the vessel capsizing.

  9. Marinette Yacht - Wikipedia

    en.wikipedia.org/wiki/Marinette_Yacht

    The yachts varied in length from 26 to 44 feet, [ 2] and included express, sport fisherman, sedan and dual cabin models on a semi- planing hull. The series was made of welded aluminum . Most Marinettes today are used on inland rivers and lakes, although some are found in saltwater locations. They are, due to their light weight, relatively ...

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