Abstract: An operation device includes an operation knob that is operable by a pull-up operation and a push-down operation about a shaft and includes a front-end operation region on a front-end side far from the shaft and a rear-end operation region on a rear end side close to the shaft, a contact detection unit to detect contact of a user with the front-end operation region and the rear-end operation region, an operation detection unit to detect the pull-up operation and the push-down operation performed on the operation knob, and a determination unit that determines an operation performed by combining contact with the front-end operation region and the rear-end operation region detected by the contact detection unit and the pull-up operation and the push-down operation detected by the operation detection unit, and also determines that at least an operation performed on the rear-end operation region is invalid when the contact is detected.

Abstract: A seat cushion includes an edge portion and a three-dimensional fiber structure including core-sheath fusible fibers and skeletal fibers thermally fused at intersections thereof. The sheaths of the core-sheath fusible fibers are made of a thermoplastic elastomer to fuse the intersections and form a bulging portion at each of the fused intersections. The skeletal fibers and the cores of the core-sheath fusible fibers are made of a non-elastomer resin. The skeletal fibers are crimp-processed bulky fibers, and a fineness of the skeletal fibers and a fineness of the core-sheath fusible fibers are in a range of 1 to 200 dtex. The seat cushion has a layered structure including a plurality of layers fused together, each of the layers has the three-dimensional fiber structure, and the seat cushion has a density distribution based on regional variations of the layered structure and a stiffness distribution that depends on the density distribution.

Abstract: A seat cushion includes an edge portion and a three-dimensional fiber structure including core-sheath fusible fibers and skeletal fibers thermally fused at intersections thereof. The sheaths of the core-sheath fusible fibers are made of a thermoplastic elastomer to fuse the intersections and form a bulging portion at each of the fused intersections. The skeletal fibers and the cores of the core-sheath fusible fibers are made of a non-elastomer resin. The skeletal fibers are crimp-processed bulky fibers, and a fineness of the skeletal fibers and a fineness of the core-sheath fusible fibers are in a range of 1 to 200 dtex. The seat cushion has a layered structure including a plurality of layers fused together, each of the layers has the three-dimensional fiber structure, and the seat cushion has a density distribution based on regional variations of the layered structure and a stiffness distribution that depends on the density distribution.

Abstract: A water jet propulsion boat has a water jet propulsion device in a body, and is propelled by the water jet propulsion device. An electric unit having a waterproof structure and being separate from the body can be removably disposed in a storage section without using any tools. The storage section is defined by a recess provided in the body and being open upward.

Abstract: A water jet propulsion boat has a water jet propulsion device in a body, and is propelled by the water jet propulsion device. An electric unit having a waterproof structure and being separate from the body can be removably disposed in a storage section without using any tools. The storage section is defined by a recess provided in the body and being open upward.

Abstract: A water jet propulsion boat has a water jet propulsion device in a body, and is propelled by the water jet propulsion device. An electric unit having a waterproof structure and being separate from the body can be removably disposed in a storage section without using any tools. The storage section is defined by a recess provided in the body and being open upward.

Abstract: A watercraft includes moveable sponsons that are moved in response to movements of the handlebars and the accelerator lever. The watercraft can include a number of different kinds of actuators for moving these sponsons relative to the hull of the watercraft. In preferred embodiments, the sponsons are moved outwardly and/or downwardly relative to the hull.

Abstract: A watercraft includes moveable sponsons that are moved in response to movements of the handlebars and the accelerator lever. The watercraft can include a number of different kinds of actuators for moving these sponsons relative to the hull of the watercraft. In preferred embodiments, the sponsons are moved outwardly and/or downwardly relative to the hull.

Abstract: A jet propulsion unit for a small watercraft including a secondary thrust arrangement. The secondary thrust arrangement includes a primary valve and a secondary valve arrangement. At least one discharge port is disposed on a hull of the watercraft. A jet propulsion unit is configured to discharge pressurized water from the steering nozzle in a substantially rearward direction from the watercraft or to discharge pressurized water through at least one discharge port disposed in the outer surface of the hull to achieve enhanced steering control of the watercraft.

Abstract: A jet propulsion unit for a small watercraft including a secondary thrust arrangement. The secondary thrust arrangement includes a primary valve and a secondary valve arrangement. At least one discharge port is disposed on a hull of the watercraft. A jet propulsion unit is configured to discharge pressurized water from the steering nozzle in a substantially rearward direction from the watercraft or to discharge pressurized water through at least one discharge port disposed in the outer surface of the hull to achieve enhanced steering control of the watercraft.