is determined that the more effluent invested in drag reduction the better either the balance will be tuned to leave the rear jets just barely enough effluent for reliable guidance or the rear jets can be left off entirely in favor of vent embedded directional controls described above in this latter case all of the effluent is used both for thrust and for drag reduction a similar system of concentric vents rear thrusting vents is also applicable to submarines to increase speed as a practical matter the engine would typically be placed fore with its effluent piped to concentric vents as far aft as is practical down the length of the sub however for nuclear submarines or any other nuclear device or craft water can be taken in and released as steam in place of conventional combustion effluents for all applications the passing of the effluent over a charged plate carrying a charge opposite the predominant charge of the surface area to be protected the passive charge typical of moving bodies through water and or a boosted charge via shipboard power source is optionally used to increase the amount of effluent closest to the protected surface level and to maximize its positional persistence the length of time that it remains there for surface craft applications the aircraft carrier in fig2 displays a sample embodiment this.