STERN DUCT, STERN ATTACHMENT, METHOD OF DESIGNING STERN DUCT, AND SHIP EQUIPPED WITH STERN DUCT

摘要

In the present invention, in the stern duct 10 attached to the front of the propeller 3 attached to the stern 2 of the hull 1, the duct body 11 has an arc shape in an angular range of 90 degrees to 140 degrees. And the radius Rr of the rear arc portion 11r formed at the rear end of the duct body 11 is 50% or less and 20% or more of the radius of the propeller 3, and the hull 1 is forward from the rear. In the state viewed, the duct body 11 so that the duct center line Yd of the duct body 11 has an inclination in the rotational direction of the propeller 3 with respect to the propeller center line Xv in the vertical direction of the propeller 3. A duct for the stern that is attached to the stern 2 with the support means 12, and can improve the hull efficiency without increasing the resistance of the hull 1 even when the duct body 11 is added to the hull 1 , A stern attachment, a method of designing a stern duct, and a ship equipped with a stern duct.