Yamaha Hatsudoki Kabushiki Kaisha

Yamaha Hatsoduki Kabushiki Kaisha

Hirofumi Imaeda

Noboru Kobayashi

Hideaki Fukamura

Yoshiki Futaki

Hideki Kishi

A watercraft having a bow rider-type configuration wherein the forwardmost riders' seats are canted slightly inwardly toward the longitudinal centerline of the watercraft so as to permit adequate leg room without overly extending the length of the hull. A pass-through connects the bow riders' portion to a main seating portion in which a bench-type seat that is adapted to accommodate three riders is provided. The pass-through between the seating portions is not significantly wider than one of the seats. Various arrangements for a storage compartment and engine and jet pump clean-out and flushing access are also provided.

Seat arrangement for a watercraft

Seat arrangement for watercraft

A small jet propelled watercraft having a hull undersurface provided with a plurality of stripes and a step at the rear end thereof to reduce porpoising without increasing drag. The watercraft is propelled by a jet propulsion unit having a discharge nozzle which is capable of trim adjustment and which is controlled by a twist grip control mounted on its steering handlebar.

Trim adjusting system for jet propulsion boat

A jet propelled watercraft having a discharge nozzle that can be adjusted for trim and an electrically operated trim condition indicator is provided for giving the rider the indication of the actual trim condition of the watercraft. In addition, an automatic trim control mechanism is provided that permits the operator to set the desired trim at varying watercraft speeds and the trim will be automatically set when those speeds are reached.

Trim adjust system for a watercraft

A watercraft having a jet propulsion unit that is supported at least in part within a tunnel on the under side of the hull and which is movable between a driving position and a service position. The control for operating the jet propulsion unit to move it between its positions is disposed within the tunnel and accessible through a service opening so that it cannot be accidentally actuated.

Control for jet propulsion unit of watercraft

Several embodiments of water jet propulsion units that are manually moveable between a downwardly facing in-the-water position and a raised, out-of-the water position. The movement includes pivotal movement about a transversely extending horizontal pivot axis and rotation about a longitudinally extending rotational axis. Latching apparatus are disclosed for holding the jet propulsion unit in at least one of its positions and in one embodiment the latching apparatus is effective to hold the jet propulsion unit in each position.

Water jet propulsion unit

A jet propulsion unit for powering a watercraft that is contained within a tunnel on the underside of the hull of the watercraft. The jet propulsion unit is rotatable about a longitudinally extending axis to rotate its water inlet opening from a downwardly facing position to a raised, out of the water storage and service position The drive for rotating the jet propulsion unit is positioned forwardly of the tunnel and out of the body of water in which the watercraft is operating.

Rotatable jet propulsion unit for watercraft

Several embodiments of jet propelled watercraft that incorporate an arrangement for hydraulically pivoting the jet propulsion unit between a normal position and a raised position and for rotating the water inlet portion of the jet propulsion unit from a downwardly facing direction to an upwardly facing service position. Hydraulic motors are employed for achieving both motions and are actuated through a common circuit for achieving sequential movement. In one embodiment, the rotary hydraulic motor is formed integrally within portions of the housing of the jet propulsion unit to provide a compact assembly.

Water jet propulsion boat

A jet propelled boat having a tunnel at its rear end in which a jet propulsion unit is movably supported. The support for the jet propulsion unit is readily detachable so that the jet propulsion unit may be easily removed from the tunnel. The tunnel is closed at its rear end by a transom of the boat in which a small opening is formed through which the jet propulsion unit may be removed.

Removable jet propulsion unit for watercraft

A V bottom hull watercraft powered by a pair of jet propulsion units that are supported for pivotal movement about horizontally disposed pivot axes and rotary movement about a longitudinal pivot axis to rotate the water inlet openings and elevate them from a downwardly facing normal operating position and an upwardly facing service position. The water inlet openings are disposed so that they extend parallel to the sides of the V bottom. Steering nozzles are supported for pivotal movement at the discharge ends of the jet propulsion units and pivot about vertically extending axes that are not perpendicular to the water inlet openings so that no vertical thrust will be exerted on the watercraft hull when the steering nozzles are pivoted to effect steering.

Growing community of inventors

Iwata, Japan

Hirofumi Imaeda