Water: The Aquajet Jetbike.

Via: really cool toys

"The aquajet Jetbike is the only personal watercraft offering both a front and rear steering mechanism. All other personal watercraft are steered only through the side to side movement of a steering nozzle located at the rear of the craft that does not give the operator any steering "feel" or "feedback" from the water.

Except when jumping waves or at rest, the Jetbike's front and rear body hull surfaces plane on the surface of the water, maintaining two contact points at all times. The Jetbike lets the rider "customize" steering with its combination of a steerable front ski and a steerable rear nozzle. This provides better directional control at high speeds and makes for very aggressive turns with exceptional handling. Where other watercraft run flat on the water's surface, the Jetbike skims and dives, playing above and below the surface.


The Jetbike's unique ballast system actually causes the craft to "sink" under the rider as he applies his weight to the craft, making it easier to remount the craft. When the Jetbike is at rest in the water, it is partially submerged, making it easier for the rider to mount, compared to all other personal watercraft, which force riders to completely climb up and out of the water to get back on the craft, as in the case of all other sit down watercraft.

Also, the engine, pump and other systems are positioned to be at the lowest center of gravity in the craft. This, along with the ballast system, acts like a keel in a sail boat, helping to keep the craft from rocking from side to side with a rider on board. Additionally, this system will not allow the craft to capsize, or roll upside-down, unlike all other personal watercraft which are nearly impossible to roll back to an upright position without help. The Jetbike is self righting at all times. Additional Braking Safety. The Jetbike is designed to slow down and stop more rapidly than other personal watercraft.


The substantial increase in total draft area and drag causes the craft to slow -- thus creating a natural water brake -- as the Jetbike sinks faster in the water. Because of the Jetbike's narrow plan view, releasing the twist throttle results in an action similar to that of a braking system. Integrated Headlight and Tail Light Safety System. The Jetbike is the only a personal watercraft to offer a headlight (patent pending) to enhance rider safety during the daylight. When on, this headlight makes the Jetbike more visible to other boating traffic, thereby enhancing safety. A rider-controlled tail light (or break light) tells those traveling behind of the Jetbike rider's intention to down.

Other Features. The Jetbike features lightweight unibody construction, a twist-grip motorcycle throttle and a power source currently configured as an in-board, low center of gravity, mid-mounted two-cylinder 90 horsepower (or optionally 12 horsepower) water-cooled engine and accompanying axle flow jet pump. The Jetbike is designed to offer on-demand acceleration and speed capability of 45 to 60 mph without sacrificing maneuverability. The rear under section of the Jetbike incorporates an inlet opening through which water flows for the jet pump. The engine is located at the lowest point in the hull of the craft, and is cooled by water supplied by the pump.

Both the exhaust and cooling systems of the Jetbike are designed to eliminate back flow or flooding of the engine compartment. Additional safety features include an automatic throttle release that immediately stops the engine if a rider falls off, and a secondary ignition cut off switch, connected to the rider by a tether, that serves as a backup device to shut off the engine in the event of the loss of a rider due to a spill or fall. The Jetbike features a removable, replaceable planing surface on the hull for racing purposes, the use of either 2 or 3 cylinder engines and other performance enhancing features."