What is the characteristic feature of a PWC's propulsion system?

The propulsion system of a Personal Watercraft (PWC) is characterized by the use of an inboard jet drive. This system draws water from beneath the craft, pumps it out through a nozzle at the rear, and this action propels the PWC forward. The inboard jet drive design contributes to the PWC’s agility and speed, enhancing maneuverability.

Using an inboard system allows for a compact design that typically offers better stability and performance in various water conditions. It also reduces the risk of propeller-related injuries, as there is no exposed propeller on the bottom of the watercraft, making it safer for riders and those in the vicinity.

In contrast to PWCs, other propulsion methods mentioned are not applicable. For example, paddle systems and sails are associated with traditional forms of watercraft, and external motors are characteristic of outboard engine systems, which are different from the integrated and streamlined nature of a jet drive. The specific mechanics and safety features of the inboard jet drive make it essential for the operation and design of a PWC.