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Marine propeller, the method for repairing marine propeller
Marine propeller, the method for repairing marine propeller
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机译：船用螺旋桨，船用螺旋桨的修理方法
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摘要
PROBLEM TO BE SOLVED: To prevent the generation of resonance and resonance sound caused by the generation of a Karman vortex in a water stream flowing over the surface of a propeller blade.SOLUTION: An outer surface of at least a rear edge part 3a of a propeller blade 3 is covered with an attenuation covering material 5 which is made of a material having a higher attenuation capability than a material forming a propeller blade 3. Desirably, the propeller blade 3 is integrally formed of a metal material, and it is preferable that a surface roughness of an area that is covered with the attenuation covering material 5 is kept rough without applying surface finish. For a material of the attenuation covering material 5, a fiber-reinforced plastic containing reinforcing fibers or a dynamic viscoelastic material such as rubber can be used. When using the rubber, magnetic rubber which has been magnetized by mixing ferrite is more preferred.
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