Abstract: The present invention provides a watercraft having steering components (steering tabs or stabilizers) for maintaining steering capability even while amount of water ejected from a propulsion pump is decreased. The steering components are movably disposed on a hull of the watercraft at or below the water level on both right and left sides to be in an “Operating State” in which resistance of water is larger or to be in a “Non-operating State” in which the resistance of water is smaller in accordance with steering operation. Furthermore, a mechanism for absorbing an external force acting on the steering components in the “Operating State” is located in a system for operating the steering components. The mechanism reacts to the external force to allow the steering components to be transformed into the “Non-operating State.

Abstract: Provided is a hull shape of a personal watercraft which can enhance speed performance, and still more, can also reduce rolling of a body. A bulging face 12 is formed on an outside part of a rear portion of a hull bottom 20 having a substantially V-shaped cross section and protrudes downward from an outside front face 20a positioned in front of the outside part. The bulging face 12 includes a fore part 13 inclined downward in the rearward direction, and a rear part 14 positioned above a virtual face A extended rearwardly from the fore part 13.

Abstract: The present invention provides a watercraft having steering components (steering tabs or stabilizers) for maintaining steering capability even while amount of water ejected from a propulsion pump is decreased. The steering components are movably disposed on a hull of the watercraft at or below the water level on both right and left sides to be in an “Operating State” in which resistance of water is larger or to be in a “Non-operating State” in which the resistance of water is smaller in accordance with steering operation. Furthermore, a mechanism for absorbing an external force acting on the steering components in the “Operating State” is located in a system for operating the steering components. The mechanism reacts to the external force to allow the steering components to be transformed into the “Non-operating State.

Abstract: A bottom structure of a personal watercraft enhances the running performance of a personal watercraft. A concavo-convex face (21) having very small concave or convex portions for drawing air from an outside of a watercraft is formed on a water contact face (S) in a bottom surface (20) of the personal watercraft during planing. The air is drawn by the concavo-convex face (21), thereby separating a water flow from the bottom surface (20). Consequently, frictional resistance to the water in the bottom surface (20) can be reduced.

Abstract: A small watercraft hull is shaped to prevent spray from being splashed on occupants of a watercraft, to enhance the course stability of the craft during turning, and to reduce the resistance of the craft body 3 to the water. A longitudinal chine, extending in a longitudinal direction, and rearwardly curved transverse chines extending in transverse directions and located in the fore part of the craft body, are provided on a V-shaped hull bottom of the craft body, the transverse chines being so formed as to cross the forward part of the longitudinal chine or an imaginary line extended forwardly from the longitudinal chine.

Abstract: This invention relates to improvements in an air-cleaner for internal combustion engines, more particularly, to an improved air-cleaner having such sound-silencing construction that an air-cleaner element is removably fixed in a vibration-isolating cover which is provided in the housing of the air-cleaner.