Ships with a bow shape that reduces resistance in waves and a bow shape that increases resistance in waves

摘要

PROBLEM TO BE SOLVED: To provide an in-wave resistance increment alleviation bow shape that can alleviate an in-wave resistance increment even when a vessel remains ballasted by focusing on a wave or a static water-level elevated position and a vessel having an in-wave resistance increment alleviation bow shape.SOLUTION: A bow shape having a bow valve 20 at a bow part 10 of a vessel comprises the formation of stem lines 11 of the bow valve 20 in two upper and lower steps to project a lower stage valve 21 forward of an upper stage valve 22, and to keep a top face 21a of the lower stage valve 21 positioned above a ballast state static water-level elevated position Athat is a water-level swelling position generated when a vessel travels under flat water in a wave-free state at a navigation speed set when designed as a representative speed for every vessel on sailing in a vessel ballast state, and positioned such that the wave overcomes the top face 21a of the lower stage valve 21 when the vessel sails at the navigation speed.SELECTED DRAWING: Figure 1