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

摘要

A duct body 11 is formed into an arc shape of an angle range from 90° to 140°, a radius of a rear end arc portion formed on a rear end of the duct body 11 is set to 50% or less and 20% or more of a radius of the propeller 3, and the duct body 11 is mounted on the stern 2 by support means 12 such that a duct center line Yd of the duct body 11 inclines in a rotation direction of the propeller 3 with respect to a propeller 3 center line in a vertical direction of the propeller 3 in a state where the ship' s hull 1 is forwardly viewed from backward, thus, the hull efficiency can be enhanced without increasing the resistance of the ship's hull 1 even if the duct body 11 is added to the ship's hull 1.