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Roller ship
The roller ship, or roller steamer, was an unconventional – and unsuccessful – ship design of the late nineteenth century, which attempted to propel itself by means of large wheels. Only one such vessel was constructed – the ''Ernest-Bazin'', named for its inventor – which was found to be impractical.
==Design==
The principle behind the design was similar to that of the slightly later hydrofoil; by avoiding as much hull contact with the water as possible, the amount of drag could be reduced and – in theory – the vessel could be made to move much faster for a given amount of power. As envisaged by Bazin, the main hull was lifted out of the water, with large hollow discs attached to each side. These discs would provide the buoyancy of the ship, as well as part of its propulsive power. These wheels were independently driven, with a separate screw lowered into the water from the hull to propel the boat.〔"The "Bazin" Roller Boat. ''Nature'' 55, 379 – 380 (18 Feb 1897). 〕
The discs were lenticular: they tapered to a point, like the hulls of ships. Indeed, when pushed forwards through the water, without any rotational movement, they behaved exactly like a conventional hull. When rotated, however, they proved in testing to be much more efficient, due to the propulsive force being expended both vertically and horizontally. It was found that the overall speed ought to be roughly two-thirds the speed of rotation of the wheels.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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