Final answer:
Personal watercraft, such as jet skis, use a jet propulsion system that expels water forcefully through a nozzle to create forward thrust.
Step-by-step explanation:
Unique Propulsion System on a Personal Watercraft
Personal watercraft, such as jet skis, typically use a jet propulsion system. Instead of propellers, they have a water jet pump that sucks in water and then expels it forcefully through a nozzle at the back of the watercraft. The reaction of the water being expelled creates a forward thrust, propelling the watercraft forward.
This type of propulsion system is unique because it doesn't rely on moving parts like propellers or paddles. It offers advantages such as high maneuverability, shallow water operation, and reduced risk of damage from debris in the water. However, it is also associated with higher fuel consumption and noise levels compared to other propulsion systems.