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A higher freeboard will give more room in the cabin, but will increase weight and drag, compromising speed. A higher freeboard, such as used on ocean liners, also helps weather waves and so reduce the likelihood of being washed over by full water waves. A low-freeboard vessel is susceptible to taking in water in rough seas.
They were low-freeboard, steam-powered ironclad vessels, with one or two rotating armored turrets, rather than the traditional broadside of guns. The low freeboard meant that these ships were unsuitable for ocean-going duties and were always at risk of swamping and possible loss, but it reduced the amount of armor required for protection.
Those that were directly modelled on Monitor were low-freeboard, mastless, steam-powered vessels with one or two rotating, armoured turrets. The low freeboard meant that these ships were unsuitable for ocean-going duties and were always at risk of swamping, flooding and possible loss.
The specifications for the Casco class originally called for a vessel with a light draft, not exceeding six feet, and a low freeboard to present the smallest possible target to Confederate guns. For the design of the new class, the Navy turned once again to John Ericsson , designer of USS Monitor .
Its low-freeboard deck—only 18 inches (46 cm) above the water—with a single gun turret gave it the appearance of a "cheesebox on a raft", according to observers of the time. [2] The designer, John Ericsson , had deliberately minimized the observable surface of the vessel and the area that it presented as a target.
The design called for the ship to have a low freeboard, and Coles' figures estimated it at 8 feet (2.4 m). Both the Controller and the Chief Constructor Edward James Reed raised serious concerns. Robinson noted that the low freeboard could cause flooding issues on the gun deck , and Reed criticised the design in 1866 both for being too heavy ...
A second design, even more abnormal, was John Ericsson's single-turreted, low-freeboard vessel. Ericsson's design had the shallowest draft and shortest estimated construction time, but against it were its extremely low freeboard, turret-mounted guns, and total reliance on steam power.
The Kearsarge-class was a group of two pre-dreadnought battleships built for the United States Navy in the 1890s. The two ships—USS Kearsarge and USS Kentucky—represented a compromise between two preceding battleship designs, the low-freeboard Indiana class and the high-freeboard USS Iowa, though their design also incorporated several improvements.