ACTIVE FORE BULB OF SHIP Russian patent published in 2004 - IPC

FIELD: shipbuilding; units for change of hydrodynamic characteristics of ship's hull through reduction of her resistance to water; control units at reactive thrust. SUBSTANCE: proposed active fore bulb of ship is made in form of water-jet propeller located symmetrically relative to ship's CL and provided with side fairings. Working member is mounted in duct between fairings. Said duct is branched in two symmetrical water ducts directed towards ship's stern extending between sides and side fairings. Duct is made in form of slots with vertical walls where cylindrical symmetrical recesses are found. Working member is received by recesses of duct; working member consists of rotor for rotation at reversal. Upper edge at duct outlet is located above ship's draft over DWL. Fore fairing provided with intake gate valves may be mounted before duct inlet. Drive outlet gate valve may be fitted at outlet of each duct. EFFECT: improved service characteristics due to reduction of wave resistance; enhanced handling of ship at any speed under any weather conditions. 3 cl, 2 dwg