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The Monitor was a highly modified version of the LCM-6 developed by the United States Navy for use as a mobile riverine assault boat in the Vietnam War. Another version served as a Command and Control Boat (CCB or Charlie Boat).
River monitors were used on inland waterways such as rivers, estuaries, deltas and lakes. Usually they had a shallow draft which was necessary for them to be able to operate in enclosed waters; but their displacement, size and draft varied depending on where they were used.
A pair of fluid-filled tanks mounted on opposite sides of a ship below the waterline. The tanks are cross-linked by piping or ducts to allow water to flow between them and at the top by vents or air pipes. The piping is sized so that as the fluid flows from side to side it damps the amount of roll. anti-submarine net. Also anti-submarine boom.
The more obvious external appearance clue to distinguish a JF from an early J2F is the deletion of the inter-aileron strut between the wings on the J2F; less noticeable perhaps is the J2F's slightly longer rear fuselage/float joining fillet beneath the tail.
A centreboard (often called a lifting foil in a modern racing dinghy) is used to provide lift to counter the lateral force from the sails. This is required for sailboats to move in directions other than downwind, since the force of the sail is never closer than 45 degrees to the apparent wind.
The Mechanical Galleon is an elaborate nef or table ornament in the form of a ship, which is also an automaton and clock. It was constructed in about 1585 by Hans Schlottheim in southern Germany. It was in the possession of Augustus, Elector of Saxony (who would have been one of the model courtiers shown on the ship).
The gunwale of an undecked boat. The gunwale (/ ˈ ɡ ʌ n əl /) is the top edge of the hull of a ship or boat. Originally the structure was the "gun wale" on a sailing warship, a horizontal reinforcing band added at and above the level of a gun deck to offset the stresses created by firing artillery.
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A leeboard is a form of pivoting keel used by a sailboat largely and very often in lieu of a fixed keel. Typically mounted in pairs on each side of a hull, leeboards function much like a centreboard, allowing shallow-draft craft to ply waters fixed keel boats cannot.
A floatplane is a type of seaplane with one or more slender floats mounted under the fuselage to provide buoyancy. By contrast, a flying boat uses its fuselage for buoyancy. Either type of seaplane may also have landing gear suitable for land, making the vehicle an amphibious aircraft.