| 摘要 |
PROBLEM TO BE SOLVED: To reduce frictional resistance between a hull and water by setting exhaust linear density of gas in the hull width direction so that saved part of propulsion power provided by reducing the frictional resistance exceeds a power required for exhaust of gas into water. SOLUTION: When a frictional resistance reduced ship A is in a navigation state, a gas supply portion 3 is operated, air is exhausted into water from each gas exhaust hole 2a of a gas exhaust portion 2 provided near a bow la. Micro bubbles generated by this air diffuse and move toward a stern along water flow line flowing around the bottom 1b, and cover the bottom 1b of the frictional resistance reduced ship A in a large range. This generation of the micro bubbles reduces the frictional resistance of a hull external plate 1 to water, and saves propulsion power of the frictional resistance reduced ship A. A control device 3b of the gas supply portion 3 sets air flow of compressed air using exhaust linear density in the hull width direction F as a control parameter.
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