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In sailing and boating, a vessel's freeboard is the distance from the waterline to the upper deck level, measured at the lowest point of sheer where water can enter the boat or ship. [1] In commercial vessels, the latter criterion measured relative to the ship's load line , regardless of deck arrangements, is the mandated and regulated meaning.
The Royal Sovereigns had reverted to a higher freeboard after several classes of low-freeboard vessel had been constructed, the last being the Trafalgar class. Low freeboard had been popular for around ten years since it required less armour and made a smaller target for gunfire to hit, although it had the disadvantage that it reduced ...
The low freeboard of the galley meant that in close action with a sailing vessel, the sailing vessel would usually maintain a height advantage. The sailing vessel could also fight more effectively farther out at sea and in rougher wind conditions because of the height of their freeboard.
These were low-freeboard vessels intended for local, coastal defense. They were badly overweight when completed, and as a result suffered from serious problems, including belt armor that was fully submerged when the ships were fully loaded, a tendency to ship excessive amounts of water, and poor handling characteristics.
Plan of HMS Alexandra 24 cm gun model 1884 in an ironclad. The central battery ship, also known as a centre battery ship in the United Kingdom and as a casemate ship in European continental navies, was a development of the (high-freeboard) broadside ironclad of the 1860s, given a substantial boost due to the inspiration gained from the Battle of Hampton Roads, the first battle between ...
Further, to reduce the interference with the main guns, no masts or sails were needed. The ships would need two steam engines for security and a minimum 12-knot speed. The trans-Atlantic concept was changed to a coastal defence ship, so a very low freeboard of 4 feet 6 inches (1.37 metres) was specified.
USS Monitor had had very little freeboard so as to bring the mass of the gun turret down, thereby increasing stability and making the boat a smaller and therefore harder target for gunfire. At the end of the American Civil War, the U.S. Navy Casco-class monitors had large ballast tanks that allowed the vessels to partially submerge during ...
Freeboard is also reduced for ships that have large openings in the hull and open cargo spaces such as Roll-on/roll-off car carriers. [6] According to the Annexes to the convention, also taken into account are the potential hazards present in different zones and different seasons and additional safety measures concerning doors, hatchways, etc.