Chambered anti-Coanda jet marine propulsion device with gaseous boundary layer for a thrust jet flow stream exhibiting staged controlled boundary layer separation properties, vessel trim adjustment, and movable thrust vector application points(s)

摘要

A marine propulsion system for use as a driving means and a progressive hull resistance characteristic changing means is herein described. The drive can develop a separation of the jet water stream flow field from the vessel hull, as well as separate the supporting ocean water flow field from the hull. The jet system air cavity doors also act as trim planes and hull planing (hydrodynamic) surface structures, and as thrust vector application control valves (in this capacity, they have the capacity to reduce drag . . . and make a vessel go faster, as well as increase it . . . by varying Coanda effect and hull plate fluid friction). The unit can be used in conjunction with an automated controlling device (such as a computerized control linked to servo motors, feedback potentiometers, and linkages) wherein a specific power-up and power-down sequence can be followed in response to sensor information. It can allow the placement of a jet pump lower in the vessel, thus reducing suction lift and wasted hydraulic head pressure losses to the nozzle point.