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|1. (WO2017038862) SHIP AND STERN SHAPE HAVING STERN DUCT|
|Applicants:||NATIONAL INSTITUTE OF MARITIME, PORT AND AVIATION TECHNOLOGY
|Title:||SHIP AND STERN SHAPE HAVING STERN DUCT|
This stern shape is equipped with a propeller 20 provided to a stern section 15 of a ship hull 10, and a stern duct 30 attached to the front of the propeller 20. The ship hull 10 has a stern in the shape of a V, a duct body 31 of the stern duct 30 has a semi-cylindrical shape, a rear edge 32 of the duct body 31 is shaped to have a parallel section 33 in the middle of an upper section of which a semicircle substantially centered around an axial center 21 of the propeller 20 is shifted to the left and right sides when viewed forward from behind the ship hull 10, the inside radius of the semicircle is set to a range of 40-80% of the radius R of the propeller 20, and the left-to-right horizontal width W of the parallel section 33 is set to 5-25% of the diameter Dp of the propeller 20, whereby maximum transport efficiency is achieved through the effect of interference between the ship hull shape and the propeller.