RECTIFYING DEVICE IN SHIP

PURPOSE:To enhance the propelling efficiency of a ship, by fitting a ring-like structure in a hull in such a way that a space is defined between the rear end edge of the ring-like structure and a propeller, and as well by providing grate- like structures to the stern bilge section of the hull front of the ring-like structure. CONSTITUTION:A ring-like structure 1 is attached to a hull 5 in such a way that a space (d) is defined between the rear end edge of the ring-like structure 1 and a propeller 4, and the ring-like structure 1 is fitted in the hull, more than 20% of the length L of the upper section of the ring-like structure. Further, grate- like structures 8 are secured to the stern bilge section 5' of the hull 5 in a horizontal plane substantially same as the rear part of the ring-like structure 1, front of the latter. Further, these grate-like structure 8 are formed in an E-letter like shape, the projection plates 10 through 12 thereof being inclined along the potential stream, and as well, a side plate 9 connecting the front end parts of the projection plates 10 through 12 is arranged in substantial parallel with the side of the hull 5. With the projection plates and the side plate, the generation of bilge vortices may be prevented.