Abstract: Waterjet flow emerging from a jet propulsor body through a cross-sectionally circular duct is conducted through a cross-sectionally rectangular duct passage extending through transition and exhaust aft sections attached to and angularly adjusted relative thereto. Under selective maneuver controls within the propulsor body, the transition section is angularly adjusted relative to the body while pivotal vanes and flaps on the exhaust section are angularly adjusted to direct exit outflow through the exhaust section for steering and reversing purposes.

Abstract: An elongated fluid dynamic water jet type of propulsion body receives an inflow of fluid through inlet openings for entry into a jet propulsor from which an outlet jet emerges for passage through an internal transition passage to an exit end between two pairs of horizontal flaps hinged to the body at the exit end for angular displacement about parallel spaced horizontal axes from horizontal neutral positions. Four pair of flaps are pivotally mounted within the transition passage for angular displacement about parallel spaced vertical axes from neutral positions. Actuators inside of the propulsion body connected to the flaps are selectively controlled to impart in-phase angular displacement to all of the flaps about their horizontal and vertical axes from the neutral positions for directional steering by angular deflection of the jet exit outflow from the exit end of the body.