A personal watercraft includes: a watercraft body; a handlebar provided on an upper front part of the watercraft body; a seat provided on an upper part of the watercraft body and extending in a front-rear direction behind the handlebar; and a pair of floats provided so as to protrude outward in a watercraft width direction from left and right side surfaces of the watercraft body in order to additionally give buoyancy to the watercraft body. Each of the floats extends in the front-rear direction alongside the seat and is arranged limitedly in a region behind the handlebar.

A mobile, wave motion-isolated, waterborne device having a platform with a plurality of support members extending beneath the platform configured to receive an articulated joint. The device further includes a plurality of corresponding clusters of spar buoys, wherein each spar buoy has an articulated joint at a first end of the spar buoy and a ballast operably configured at the second end. The articulated joint of each spar buoy within the cluster corresponds to a swivel footing configured to receive an articulated joint. The swivel footing itself includes an articulating joint. Each articulated joint of the swivel footing corresponds to one of the support members of the platform. The cluster of spar buoys can optionally move between a vertical orientation and a horizontal orientation. An optional movable ballast may be used in place of a stationary ballast. The invention also includes optional thrust/propulsion, steering, and damping features.

A mobile, wave motion-isolated, waterborne device having a platform with a plurality of support members extending beneath the platform configured to receive an articulated joint. The device further includes a plurality of corresponding clusters of spar buoys, wherein each spar buoy has an articulated joint at a first end of the spar buoy and a ballast operably configured at the second end. The articulated joint of each spar buoy within the cluster corresponds to a swivel footing configured to receive an articulated joint. The swivel footing itself includes an articulating joint. Each articulated joint of the swivel footing corresponds to one of the support members of the platform. The cluster of spar buoys can optionally move between a vertical orientation and a horizontal orientation. An optional movable ballast may be used in place of a stationary ballast. The invention also includes optional thrust/propulsion, steering, and damping features.

A watercraft with a rigid outer hull having a substantially circular shape in plan view and a rounded bottom surface for contacting a body of liquid, and a rigid top surface disposed opposite said bottom surface and integrally formed with the outer hull, the top surface having an annular stability portion with convex walls in cross-section and a recessed flat-bottomed deck portion adapted to receive a person, and an edge of the recessed deck portion being disposed inwardly from an outermost edge of the top portion by a distance, and a method for using same.

A watercraft with a rigid outer hull having a substantially circular shape in plan view and a rounded bottom surface for contacting a body of liquid, and a rigid top surface disposed opposite said bottom surface and integrally formed with the outer hull, the top surface having an annular stability portion with convex walls in cross-section and a recessed flat-bottomed deck portion adapted to receive a person, and an edge of the recessed deck portion being disposed inwardly from an outermost edge of the top portion by a distance, and a method for using same.

A sponson attachment for an airboat allows the airboat to increase its safety and stability very quickly. A method for attaching a sponson to an airboat hull includes attaching first and second flexible tethers to a side of the sponson. The method also includes removably securing the first flexible tether to an exterior of the airboat hull adjacent a gunnel, and removably securing the second flexible tether below the first flexible tether on the exterior of the hull.

A mobile, wave motion-isolated, waterborne device having a platform with a plurality of support members extending beneath the platform configured to receive an articulated joint. The device further includes a plurality of corresponding clusters of spar buoys, wherein each spar buoy has an articulated joint at a first end of the spar buoy and a ballast operably configured at the second end. The articulated joint of each spar buoy within the cluster corresponds to a swivel footing configured to receive an articulated joint. The swivel footing itself includes an articulating joint. Each articulated joint of the swivel footing corresponds to one of the support members of the platform. The cluster of spar buoys can optionally move between a vertical orientation and a horizontal orientation. An optional movable ballast may be used in place of a stationary ballast. The invention also includes optional thrust/propulsion, steering, and damping features.

A mobile, wave motion-isolated, waterborne device having a platform with a plurality of support members extending beneath the platform configured to receive an articulated joint. The device further includes a plurality of corresponding clusters of spar buoys, wherein each spar buoy has an articulated joint at a first end of the spar buoy and a ballast operably configured at the second end. The articulated joint of each spar buoy within the cluster corresponds to a swivel footing configured to receive an articulated joint. The swivel footing itself includes an articulating joint. Each articulated joint of the swivel footing corresponds to one of the support members of the platform. The cluster of spar buoys can optionally move between a vertical orientation and a horizontal orientation. An optional movable ballast may be used in place of a stationary ballast. The invention also includes optional thrust/propulsion, steering, and damping features.

A watercraft with a rigid outer hull having a substantially circular shape in plan view and a rounded bottom surface for contacting a body of liquid, and a rigid top surface disposed opposite said bottom surface and integrally formed with the outer hull, the top surface having an annular stability portion with convex walls in cross -section and a recessed flat-bottomed deck portion adapted to receive a person, and an edge of the recessed deck portion being disposed inwardly from an outermost edge of the top portion by a distance, and a method for using same.

A mobile, wave motion-isolated, waterborne device having a platform with a plurality of support members extending beneath the platform configured to receive an articulated joint. The device further includes a plurality of corresponding clusters of spar buoys, wherein each spar buoy has an articulated joint at a first end of the spar buoy and a ballast operably configured at the second end. The articulated joint of each spar buoy within the cluster corresponds to a swivel footing configured to receive an articulated joint. The swivel footing itself includes an articulating joint. Each articulated joint of the swivel footing corresponds to one of the support members of the platform. The cluster of spar buoys can optionally move between a vertical orientation and a horizontal orientation. An optional movable ballast may be used in place of a stationary ballast. The invention also includes optional thrust/propulsion, steering, and damping features.