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A hull is the watertight body of a ship, boat, submarine, or flying boat. The hull may open at the top (such as a dinghy), or it may be fully or partially covered with a deck. Atop the deck may be a deckhouse and other superstructures, such as a funnel, derrick, or mast. The line where the hull meets the water surface is called the waterline.
Sea surface temperature can vary from a minimum of −2 °C (28 °F) to a maximum of about 32 °C (90 °F). Higher surface temperatures decrease rapidly with depth, and generally reach a steady-state of about 2 °C (36 °F) by about 1,000 metres (3,300 ft), though on Australia's Northwest Shelf, water and seabed temperature may exceed 30 °C ...
Most submarine deck guns were open, with or without a shield; however, a few larger submarines placed these guns in a turret. [citation needed] The main deck gun was a dual-purpose weapon used to sink merchant shipping or shell shore targets, or defend the submarine on the surface from enemy aircraft and warships.
The 1960s Soviet Project 1231 was a concept for a missile boat that would travel with hydrofoils on the surface and then dive to avoid observation, which was never built. [ 16 ] The 2010 French SMX-25 was a submarine design concept by defence company, DCNS , with surface ship characteristics, which would allow high surface speed for more rapid ...
A fishing vessel is a boat or ship used to catch fish and other valuable nektonic aquatic animals (e.g. shrimps/prawns, krills, coleoids, etc.) in the sea, lake or river. Humans have used different kinds of surface vessels in commercial, artisanal and recreational fishing.
The 100-ton SES 100B was built for the US Navy as a 1/10 scale model to test the feasibility of using hovercraft and other Surface Effect Ships in combat situations. The top-secret specifications called for a ship capable of entering a combat zone at a speed of over 80 knots (150 km/h; 92 mph) and disgorging a tank and 100 soldiers onto a beach ...
When this happens wetted surface area drops radically and the boats accelerate up to 1.2 to 1.5 times the speed of the prevailing wind. These boats are very light (all up weight is less than 40 kg) and very fast, They hydrofoil in as little as 8 knots (15 km/h) of breeze ("sit on the deck breeze" for most dinghy classes).
A bridge (also known as a command deck), or wheelhouse (also known as a pilothouse), is a room or platform of a ship, submarine, airship, or spaceship from which the ship can be commanded. When a ship is under way, the bridge is manned by an officer of the watch aided usually by an able seaman acting as a lookout .