DEVICE FOR INCREASING SHIP'S SPEED Russian patent published in 2002 - IPC

FIELD: shipbuilding; devices for increasing ship's speed (or saving fuel) due to use of energy of water admitted to ship's tunnels through fore openings. SUBSTANCE: device includes at least one passage with fore inlet opening and side or aft outlet opening; propulsors are mounted in tunnel which has several turns; behind said turns aft wall is made in form of wing, mainly of segment type; opposite side is provided with artificial roughness; some propulsors are located behind turn before wing surface. EFFECT: possibility of obtaining additional thrust both with and without propulsors in tunnels. 4 dwg