Boat building is the design and construction of boats and their systems. This includes at a minimum a hull, with propulsion, mechanical, navigation, safety and other systems as a craft requires.
A deck is a permanent covering over a compartment or a hull of a ship. On a boat or ship, the primary or upper deck is the horizontal structure that forms the "roof" of the hull, strengthening it and serving as the primary working surface. Vessels often have more than one level both within the hull and in the superstructure above the primary deck, similar to the floors of a multi-storey building, that are also referred to as decks, as are certain compartments and decks built over specific areas of the superstructure. Decks for some purposes have specific names.
Military vehicles are commonly armoured to withstand the impact of shrapnel, bullets, shells, rockets, and missiles, protecting the personnel inside from enemy fire. Such vehicles include armoured fighting vehicles like tanks, aircraft, and ships.
A double hull is a ship hull design and construction method where the bottom and sides of the ship have two complete layers of watertight hull surface: one outer layer forming the normal hull of the ship, and a second inner hull which is some distance inboard, typically by a few feet, which forms a redundant barrier to seawater in case the outer hull is damaged and leaks.
Armour with two or more plates spaced a distance apart falls under the category of spaced armour. Spaced armour can be sloped or unsloped. When sloped, it reduces the penetrating power of bullets and solid shot, as after penetrating each plate projectiles tend to tumble, deflect, deform, or disintegrate; spaced armour that is not sloped is generally designed to provide protection from explosive projectiles, which detonate before reaching the primary armour. Spaced armour is used on military vehicles such as tanks and combat bulldozers. In a less common application, it is used in some spacecraft that use Whipple shields.
Belt armor is a layer of heavy metal armor plated onto or within the outer hulls of warships, typically on battleships, battlecruisers and cruisers, and aircraft carriers.
A submarine hull has two major components, the light hull and the pressure hull. The light hull of a submarine is the outer non-watertight hull which provides a hydrodynamically efficient shape. The pressure hull is the inner hull of a submarine that maintains structural integrity with the difference between outside and inside pressure at depth.
The Normandie class consisted of five dreadnought battleships ordered for the French Navy in 1912–1913. It comprised Normandie, the lead ship, Flandre, Gascogne, Languedoc, and Béarn. The design incorporated a radical arrangement for the twelve 340 mm (13.4 in) main battery guns: three quadruple-gun turrets, the first of their kind, as opposed to the twin-gun turrets used by most other navies. The first four ships were also equipped with an unusual hybrid propulsion system that used both steam turbines and triple-expansion steam engines to increase fuel efficiency.
The anti-torpedo bulge is a form of defence against naval torpedoes occasionally employed in warship construction in the period between the First and Second World Wars. It involved fitting partially water-filled compartmentalized sponsons on either side of a ship's hull, intended to detonate torpedoes, absorb their explosions, and contain flooding to damaged areas within the bulges.
The Myōkō-class cruisers were a series of four heavy cruisers built for the Imperial Japanese Navy in the late 1920s. Three were lost during World War II.
Avenger-class mine countermeasures ships are a class of 14 ships constructed for the United States Navy from 1987 to 1994, designed to clear mines from vital waterways. The ships have the hull designator MCM.
Yaeyama may refer to one of several naval ships of Japan:
Naval armor refers to the various protections schemes employed by warships. The first ironclad warship was created in 1859, and the pace of armour advancement accelerated quickly thereafter. The emergence of battleships around the turn of the 20th century saw ships become increasingly large and well armoured. Vast quantities of heavily armoured ships were used during the World Wars, and were crucial in the outcome. The emergence of guided missiles in the last part of the 20th century has greatly reduced the utility of armor, and most modern warships are now only lightly armored.
The Uragaclass was a series of 2 mine countermeasure vessels for the Japan Maritime Self-Defense Force. They were both built and commissioned in the 1990s.
JDS Hayase (MST-462) was a minesweeper for the Japan Maritime Self-Defense Force.
OPS-9 is a two-dimensional radar manufactured by Fujitsu. It is installed as an anti-water search radar on the Maritime Self-Defense Force's escort ship. Variations include OPS-9B and OPS-9C.
The Awaji class is a class of minesweepers of the Japan Maritime Self-Defense Force.
The Uwajimaclass is a class of coastal minesweepers of the Japan Maritime Self-Defense Force.
The Umitaka-class submarine chaser was a class of submarine chasers of the Japan Maritime Self-Defense Force after the Second World War, in the late 1950s.
Japan Maritime Self-Defense Force 