A waterjet propulsion system designed for mounting externally on a boat transom, similar to a propeller-driven outboard motor, differs fundamentally from traditional propeller-driven systems. Instead of a propeller, these units use an impeller housed within a duct to draw water in and expel it at high velocity, creating thrust. This configuration offers distinct advantages in specific boating environments.
These specialized propulsion systems excel in shallow water navigation where submerged debris or ground contact poses a risk to propellers. Their enhanced maneuverability in tight spaces also makes them popular choices for specific applications. The absence of an exposed propeller further enhances safety for swimmers and divers. While initially developed for specialized commercial purposes, the technology has become increasingly accessible for recreational boating, expanding its market and application.