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(12) Patent Application Publication (10) Pub. No.: US 2011/0053441 A1 Sakamoto (43) Pub

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(12) Patent Application Publication (10) Pub. No.: US 2011/0053441 A1 Sakamoto (43) Pub US 2011 0053441A1 (19) United States (12) Patent Application Publication (10) Pub. No.: US 2011/0053441 A1 Sakamoto (43) Pub. Date: Mar. 3, 2011 (54) TWIN-SKEGSHIP (52) U.S. Cl. .......................................................... 440/66 (76) Inventor: Toshinobu Sakamoto, Nagasaki (JP) (21) Appl. No.: 12/990,009 (57) ABSTRACT Provided is a twin-skeg ship that allows for a further improve (22) PCT Filed: Oct. 20, 2008 ment in propulsion performance (propulsion efficiency). A twin-skeg ship (10) having a pair of left and right skegs (3) on (86). PCT No.: PCT/UP2008/068987 the bottom (2) of a stern has reaction fins 5, each comprising a plurality of fins 5a extending radially from a bossing (6) S371 (c)(1), fixed to a stern frame (7) provided at a rear end of the skeg (3), (2), (4) Date: Nov. 12, 2010 or from a fin boss provided on the bossing (6), in a range O O where a flow immediately in front of a propeller (4) attached Publication Classification to the skeg (3) with a propeller shaft (4a) therebetween has a (51) Int. Cl. component in the same direction as a rotational direction of B63H I/28 (2006.01) the propeller (4). SKEG HULL SKEG CENTERLINE CENTERLINE CENTERLINE Patent Application Publication Mar. 3, 2011 Sheet 1 of 8 US 2011/0053441 A1 - O s as e rs CO - d - CD s to v ? ? CY se Patent Application Publication Mar. 3, 2011 Sheet 2 of 8 US 2011/0053441 A1 N LL 2. C9 d - Salt CMO H. 2 CD CN 2 -- CD E----- a caaaad m H t Lal CP : : Patent Application Publication Mar. 3, 2011 Sheet 3 of 8 US 2011/0053441 A1 FIG 3 SKEG SKEG CENTERLINE | CENTERLINE 5a 6 6 5a 5-(5a 5a)-5 4a 4a 5a HULL CENTERLINE FIG. 4 CENTERLINESKEG SEPN 65 0° OF PROPELLER - N M , Patent Application Publication Mar. 3, 2011 Sheet 4 of 8 US 2011/0053441 A1 FIG. 5 ROTATIONAL SKEG DIRECTION CENERLINE OF PROPELLER G = 0 1, 1. Patent Application Publication Mar. 3, 2011 Sheet 5 of 8 US 2011/0053441 A1 FIG. 6 WITHOUT REACTION FN 2 HORSEPOWER REDUCTION OF ABOUT 4% SHP SPEED FIG. 7 - FLOW DIRECTION ANGLE was a war AVERAGE FLOW WELOCITY O 5 O O 0° 45° 90° 135° 180° 225 270 315 360° 6 (deg) Patent Application Publication Mar. 3, 2011 Sheet 6 of 8 US 2011/0053441 A1 FIG. 8 s PLANE PERPENDICULAR TO PROPELLER SHAFT WX o m m --- o w - - - - -- w c Ya. FIG. 9 PLANE PERPEND CULAR TO PROPELLER SHAFT Patent Application Publication Mar. 3, 2011 Sheet 7 of 8 US 2011/0053441 A1 FIG 10 HULL CENTERLINE FIG. 12 5a 5a 5a 5a 4a 4a HULL CENTERLINE Patent Application Publication Mar. 3, 2011 Sheet 8 of 8 US 2011/0053441 A1 FIG. 14 5a 5a 5a 6 6 5a 5K 5a 4a 4a 5a 5 5a 5a 5a HULL CENTERLINE 5a FIG. 15 5 5a 5a 5 5a 5a 5a 6 6 5a 4 a 4a HULL CENTERLINE US 2011/0053441 A1 Mar. 3, 2011 TWIN-SKEGSHIP reaction fins, each including a plurality of fins extending radially from a bossing fixed to a stern frame provided at a TECHNICAL FIELD rear end of the skeg, or from a fin boss provided on the bossing, in a range where a flow direction angle immediately 0001. The present invention relates to twin-skeg ships hav in front of a propeller attached to the skeg with a propeller ing a pair of left and right skegs provided on the bottom of the shaft therebetween is -10° or more. Stern so as to Support propeller shafts. 0013 More preferably, in the above twin-skeg ships, the reaction fins are each provided in a range where a value BACKGROUND ART calculated by dividing a flow velocity immediately in front of 0002. A twin-skeg ship having a pair of left and right the propeller attached to the skeg with the propeller shaft propeller shafts Supported by skegs integrated with the hull so therebetween by the speed of the ship is 0.7 or less. as to form a tunnel-like bottom recess between the left and 0014. A third aspect of a twin-skeg ship according to the right skegs is known in the related art (see, for example, present invention is a twin-skeg ship having a pair of left and Patent Citation 1). right skegs on the bottom of a stern, and the twin-skeg ship has 0003. On the other hand, a reaction fin has been devised as reaction fins, each including a plurality of fins extending a propulsion-performance improving unit installed in a ship radially from a bossing fixed to a stern frame provided at a to improve the propulsion performance of the ship (unit for rear end of the skeg, or from a fin boss provided on the improving the speed of the ship with the same horsepower) bossing, in a range where a value calculated by dividing a flow (see, for example, Patent Citation 2). velocity immediately in front of a propeller attached to the skeg with a propeller shaft therebetween by the speed of the Patent Citation 1: ship is 0.7 or less. 0004 Japanese Unexamined Patent Application, Publica 0015. A fourth aspect of a twin-skeg ship according to the tion No. HEI-8-133172 present invention is a twin-skeg ship having a pair of left and right skegs on the bottom of a stern, and fins are installed only Patent Citation 2: on outer sides of the port and starboard skegs. 0016. In the twin-skeg ships according to the present 0005 Japanese Unexamined Patent Application, Publica invention, the reaction fins in front of the propellers are tion No. HEI-5-185986 installed only at sites where the fins are effective so that flows in the directions opposite to the rotational directions of the DISCLOSURE OF INVENTION propellers can be effectively created at those sites, thus 0006. A twin-skeg ship (particularly, a twin-skeg ship hav increasing the wake gain and therefore improving the propul ing a pair of left and right propellers that rotate inward as sion performance (propulsion efficiency). viewed from the stern) has the central axes of propeller shafts 0017. The present invention has the advantage of further extending off the centerline of the hull, and the stern shape improving the propulsion performance (propulsion effi and the propeller shape can be modified so as to increase the ciency). rotating flow component in the opposite direction to the rota tion of the propellers, thus providing the same effect as a BRIEF DESCRIPTION OF DRAWINGS reaction fin. 0018 FIG. 1 is a left side view of the stern of a twin-skeg 0007 Accordingly, in the related art, a reaction fin has not ship according to a first embodiment of the present invention been applied to a twin-skeg ship because the fin creates resis as viewed from the port side. tance underwater while improving the propulsion perfor (0019 FIG. 2 is a diagram of a hull shown in FIG. 1, mance of the ship. showing cross sections taken in the breadth direction along 0008. However, a further improvement in propulsion per arrows A-A, B-B, and C-C. formance during sailing has been demanded for more energy 0020 FIG. 3 is a sectional view of the hull shown in FIG. saving sailing. 1 taken in the breadth direction along arrow D-D. 0009. An object of the present invention, which has been 0021 FIG. 4 is a diagram showing the results of a detailed made in light of the above circumstances, is to provide a analysis of a flow field immediately in front of a propeller twin-skeg ship that allows for a further improvement in pro attached to a portskeg with a propeller shaft therebetween for pulsion performance (propulsion efficiency). a certain twin-skeg ship having a pair of left and right propel 0010. To solve the above problem, the present invention lers that rotate inward as viewed from the stern. employs the following Solutions. 0022 FIG. 5 is a diagram showing the results of a detailed 0011. A first aspect of a twin-skeg ship according to the analysis of a flow field immediately in front of a propeller present invention is a twin-skeg ship having a pair of left and attached to a starboard skeg with a propeller shaft therebe right skegs on the bottom of a stern, and the twin-skeg ship has tween for a certain twin-skeg ship having a pair of left and reaction fins, each including a plurality of fins extending right propellers that rotate inward as viewed from the stern. radially from a bossing fixed to a stern frame provided at a 0023 FIG. 6 is a graph showing experimental results rear end of the skeg, or from a fin boss provided on the obtained by sailing the twin-skeg ship according to the first bossing, in a range where a flow immediately in front of a embodiment of the present invention. propeller attached to the skeg with a propeller shaft therebe 0024 FIG. 7 is a graph showing the results of calculation tween has a component in the same direction as a rotational of flow angle (flow direction angle) and average flow velocity direction of the propeller. immediately in front of a propeller attached to a port skeg 0012. A second aspect of a twin-skeg ship according to the with a propeller shaft therebetween for a certain twin-skeg present invention is a twin-skeg ship having a pair of left and ship having a pair of left and right propellers that rotate right skegs on the bottom of a stern, and the twin-skeg ship has inward as viewed from the stern.
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