JP2009220612A - Small planing boat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small planing boat allowing improvement of turning performance and obtaining of riding comfort by a driver and a fellow passenger without increasing water contact resistance during linear planing. <P>SOLUTION: A hull 11 of the small planing boat 10 is constituted of a bottom face part 11a and a side face part 11b extending upward from an edge part of the bottom face part 11a. In a part located on an upper side of a draft line when the small planing boat linearly planes in both side parts of a front part side of the side face part 11b, stabilizers 20a and 20b are provided. Lower faces 22 of the stabilizers 20a and 20b are made inclined faces inclined upward from the side face part 11b toward the outside. An inclined angle in a part close to the side face part 11b of the bottom face part 11a and inclined angles of the lower faces 22 of the stabilizers 20a and 20b are made substantially the same. The stabilizers 20a and 20b are arranged along parts displaced upward from a rear part side to a front part side in a chine 11c. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a small planing boat provided with a structure for improving turning performance in a hull constituting a lower part of a hull.

  Conventionally, there are small planing boats that slide by rotating the impeller with the driving force of the engine and injecting water, and in these small planing boats, sponsons are attached to both sides of the hull to stabilize There is one that can run (for example, Patent Document 1). In this small planing boat (water jet propulsion boat), rear sponsons that are long in the front-rear direction are provided on both sides on the rear side of the hull, and fin-shaped front fins are provided on both sides on the front side of the hull. . When the hull is tilted due to a sudden turn, the rearponson grips the water by immersing it in the water so that the hull is difficult to flow backward, and also suppresses the tilt of the hull.

Further, the front fin is submerged in water during a sudden turn so that the hull is less likely to flow forward and can be turned quickly and rapidly. The front fin is formed of a plate-like member that is bent in a substantially L shape when viewed from the front and is triangular when viewed from above, and is inclined so that the front side is positioned upward and the rear side is positioned downward. In this state, it is fixed to the hull through bolts and nuts.
JP 2001-233288 A

  In recent years, so-called cruiser-type ones with two or three people have become mainstream among small planing boats. In this cruiser-type small planing boat, it is required that the driver and the passenger can get a comfortable ride while ensuring turning performance. However, with the conventional small planing boat described above, it is possible to make a sharp turn, but as soon as the front fins are submerged in water, the resistance of the water increases and the behavior of the hull changes, so that There is a risk of discomfort. In order to solve this problem, it is conceivable to increase the resistance of water by increasing the width of the hull, but according to this, the resistance to water contact increases even during straight running, and the speed of the small planing boat This causes a problem of lowering.

  The present invention has been made to cope with the above-described problems, and its object is to improve turning performance without increasing the water contact resistance during straight running and to provide a comfortable ride for the driver and passengers. It is to provide a small planing boat that can provide comfort.

  In order to achieve the above object, a structural feature of the personal watercraft according to the present invention is a personal watercraft including a hull that forms a lower part of a hull and a deck that forms an upper part of the hull, The hull is composed of a bottom surface portion and a side surface portion extending upward from the edge of the bottom surface portion, and the small planing boat is arranged from the bottom surface side in a portion located above the draft line when the small planing boat runs straight on the side surface portion. When viewed, a pair of bulges extending in the front-rear direction in a state of projecting outward from both sides of the side surface are provided symmetrically, and the lower surfaces of the pair of bulges are directed upward from the hull side to the outside. The reason is that the surface is inclined.

  Even in the small planing boat according to the present invention configured as described above, when the hull is tilted at the time of turning, the bulging portion located inside the turning direction comes into contact with water and the water contact resistance increases. However, in the personal watercraft according to the present invention, since the lower surface of the bulging portion is configured by an inclined surface provided with a predetermined angle so as to be positioned above the horizontal direction, water is caused by the bulging portion. It is guided to flow along the lower surface of the bulging portion without being grasped. For this reason, even when the bulging portion is submerged in water during turning, it is possible to prevent the water contact resistance from abruptly increasing and the behavior of the hull from being suddenly changed. In addition, a so-called suction effect can be obtained in which the bulging portion sucks fluid water during turning. As a result, the driver and the passenger can obtain a comfortable ride while improving the turning performance.

  In addition, since the bulge is located above the draft line during straight run, there is no need to increase unnecessary water contact resistance during straight run and the bulge is provided in a small planing boat. The speed does not decrease. For this reason, a driver | operator and a passenger | crew can obtain comfortable riding comfort also at the time of a straight run. In addition, straight running is a state where a small planing boat slides straight on the water, and in a stopped state or in a trolling state before transition to sliding, the bulge is usually located below the water line. Yes. Moreover, the bulging part which concerns on this invention may be formed integrally with a hull, may be comprised by another member, and may be fixed to a hull with fixing tools, such as a volt | bolt.

  Further, another structural feature of the personal watercraft according to the present invention is that the center part in the longitudinal direction of the pair of bulge parts is positioned in front of the center part in the longitudinal direction of the hull or the center of gravity of the hull. That is. The small planing boat gradually moves forward when it starts sailing. Therefore, by arranging the bulging portion closer to the front of the hull or forward of the center of gravity of the hull, it is possible to more reliably prevent the bulging portion from contacting the water surface during straight running.

  As a result, when the small planing boat runs straight, the bulging portion does not affect the sliding of the small planing boat, and the driver and passengers can obtain a comfortable ride during the straight running. In addition, when a personal watercraft starts to sail, it first proceeds in a trolling state. At this low speed, the bulging part is located below the normal water line and is submerged. Then, as the speed increases, the hull displaces upward while taking a forwardly rising posture due to the resistance of water, and the waterline goes down. When the speed exceeds a predetermined speed, the boat moves to a sliding state. For this reason, by arranging the bulging part closer to the front of the hull, it is possible to shorten the time until the bulging part comes out above the water line, and minimizes the resistance of water by the bulging part when going straight ahead. To the limit. This improves the ride comfort when traveling straight.

  Still another structural feature of the personal watercraft according to the present invention is that the lower ends of the pair of bulges are positioned in the vicinity of the boundary line between the bottom surface and the side surface. According to this, since a step that affects the flow of water does not occur between the bottom surface portion and the bulging portion, turbulence or the like does not occur in the water flow from the bottom surface portion to the lower portion of the bulging portion during turning, Water flows smoothly against a small planing boat. As a result, the small planing boat does not generate vibrations and behaviors that are unpleasant for the driver and passengers, and the riding comfort is further improved.

  Still another structural feature of the personal watercraft according to the present invention is that the angle of inclination of both side portions near the side surface portion of the bottom surface portion in the vertical cross-sectional shape of the hull portion of the portion where the pair of bulge portions are provided, and The inclination angle of the lower surface of the bulging portion disposed in the vicinity of both side portions of the bottom surface portion near the side surface portion is made substantially the same. According to this, since the bottom surface portion and the lower surface of the bulging portion are positioned substantially on the same plane, the flow of water from the bottom surface portion to the lower surface of the bulging portion during turning makes the flow direction halfway. It flows smoothly without changing. As a result, the water contact resistance increases moderately, and the small planing boat does not generate vibrations or behaviors that are unpleasant for the driver or passengers, thereby improving the riding comfort.

  Still another structural feature of the personal watercraft according to the present invention is that a portion that is displaced upward from the rear side to the front side of the hull is formed at the boundary line between the bottom surface and the side surface. The pair of bulging portions is located in the vicinity of the portion of the boundary line that is displaced upward from the rear side of the hull toward the front side. According to this, since the bulging part is arranged in line with the boundary line between the bottom part and the side part that are rising upward, when the small planing boat makes a transition from straight running to turning, the bulging part is in water. It begins to touch in a state of being inclined with respect to it. As a result, as the inclination of the small planing boat increases due to turning, the water contact resistance due to the bulging portion gradually increases. That is, the water contact resistance due to the bulging portion is smoothly increased, and the riding comfort is improved.

  Still another structural feature of the personal watercraft according to the present invention is that the front surfaces of the pair of bulging portions are inclined from the portion in contact with the side surface portions to the outside rear side at an acute angle with respect to the side surface portions. This is because it is composed of an extended inclined surface. According to this, since the angle of the front surface of the bulging portion with respect to the side surface portion of the hull is an acute angle, the water hitting the bulging portion from the front can flow smoothly backward. Thereby, when the bulging part is submerged at low speed, the resistance of water by the bulging part can be minimized. In addition, when turning, it is possible to reduce unnecessary water resistance from the front while ensuring necessary water contact resistance, and ride comfort is improved. In this case, the angle is preferably 45 degrees or less.

  Still another structural feature of the personal watercraft according to the present invention is that at least the front side portion of the upper surface of the pair of bulging portions is externally exposed at an acute angle from the portion in contact with the side surface portion to the side surface portion. That is, it is constituted by an inclined surface extending inclinedly downward. According to this, when the bulging part is submerged at low speed, the water flowing over the upper surface of the bulging part can be smoothly flowed backwards, and splashes occur and can be applied to the driver and passengers. This can be prevented. In this case, the angle is preferably 45 degrees or less.

  Still another structural feature of the personal watercraft according to the present invention is that a seating portion on which a passenger sits is provided on the hull, and a pair of bulging portions are provided in front of the seating portion. According to this, when the driver or the passenger gets into the small planing boat from the side, the bulging portion does not get in the way, and the boarding becomes easy.

  Still another structural feature of the personal watercraft according to the present invention is that when a hull and a deck are provided with a gunnel portion that protrudes to the outside of the hull, and the small personal watercraft is viewed from the bottom side. In addition, the bulging portion is located inside the gunnel portion. According to this, at the time of berthing, it can prevent that a bulging part collides with a berthing surface and is damaged. In addition, the gunnel part is usually made of rubber and other materials that are durable and resistant to damage assuming berthing, so the hull can be brought into contact with the berthing surface, making it easy for operators and passengers to get on and off. become. Furthermore, even if water is splashed up by the bulging portion while the small planing boat is running, it is splashed downward by the gunnel portion, so that it is possible to prevent splashing of water on the deck.

  Further, another structural feature of the small planing boat according to the present invention is that the rear side of the rear portion of the side surface portion is provided with the bulging portion, and when the small planing boat runs straight ahead of the waterline, When the small planing boat is turned upward, the rear sponson that increases the water contact resistance is provided symmetrically at a position where the small planing boat is submerged when located inside the turn. According to this, a rear sponson is provided at the rear part of the hull, and the swivel performance of the small planing boat is further improved by providing the bulge part ahead of it. In particular, a more preferable turning performance can be obtained by making the shape of the rear sponsons easy to grasp water.

  Still another structural feature of the personal watercraft according to the present invention is that the bulging portion is formed of a separate member from the hull and is detachably attached to the hull. By forming the bulging portion with a member different from the hull, the hull can be easily formed. Moreover, when a bulging part is unnecessary, it can also remove from a hull.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 and 2 show a personal watercraft 10 according to the embodiment. In this personal watercraft 10, the hull 10a is composed of a hull 11 and a deck 12, and the periphery of the hull 11 and the deck 12 are joined in a watertight manner to form a gunnel portion 12a around the hull 10a. Has been. The hull 11 includes a bottom surface portion 11a (see FIG. 4) whose outer shape is substantially V-shaped when viewed from the front-rear direction, and a side surface portion extending obliquely upward to the outside from the edge of the bottom surface portion 11a. 11b. And the chine 11c which comprises the boundary line which concerns on this invention is formed in the boundary part of the bottom face part 11a and the side part 11b.

  The chine 11c extends from the rear end side of the hull 11 toward the center side so as to be parallel to the gunnel portion 12a, and after passing the center portion of the hull 11, it gradually displaces upward toward the front side. It is formed to do. For this reason, the width in the height direction of the side surface portion 11 b gradually decreases from the vicinity of the center portion of the hull 11 toward the front side. Further, as shown in FIG. 2, a plurality of stripes 11d having different lengths extend along the front-rear direction of the hull 10a on the bottom surface portion 11a. The stripes 11d are formed of ridges having a substantially triangular cross-sectional shape, and are arranged at intervals in the width direction of the bottom surface portion 11a.

  The stripe 11d located on the center side of the bottom surface portion 11a is shorter than the stripe 11d located on the outside side of the bottom surface portion 11a. The two stripes 11d located on the outermost side are connected on the front side of the bottom surface portion 11a. Further, a steering handle 13 is provided at a substantially center in the front-rear direction of the upper portion of the hull 10a, and a seat 14 as a seating portion according to the present invention is provided behind the steering handle 13. As shown in FIG. 3, an engine 15 is provided at the center of the bottom of the hull 10a, and air for guiding outside air into the hull 10a is provided at a front side portion of the hull 10a. A duct 16 is provided.

  The air duct 16 is formed so as to extend vertically from the upper part of the hull 10a to the bottom of the hull 10a, and sucks external air from the upper end through a waterproof structure (not shown) provided on the deck 12. The configuration is such that the lower end is led to the bottom side in the hull 10a. And the fuel tank 17 for accommodating a fuel is installed in the front part side in the hull 10a. A propulsion unit 18 is installed at the rear end of the hull 10a. The propulsion unit 18 is connected to the engine 15 via an impeller shaft (not shown). A steering nozzle 18a is attached to the rear end of the propulsion unit 18 to change the traveling direction of the personal watercraft 10 to the left and right by moving the rear side to the left and right according to the operation of the steering handle 13. Yes.

  Although not shown, an intake box is installed between the engine 15 and the fuel tank 17 in the hull 10a. The intake box is taken into the hull 10a via the air duct 16. The air is supplied to the engine 15. Further, fuel is supplied to the engine 15 from the fuel tank 17. The fuel supplied from the fuel tank 17 is atomized by a fuel injection device (not shown) and injected into the cylinder of the engine 15. At this time, the fuel is mixed with the air supplied from the intake box and sent to the engine 15 as an air-fuel mixture, and the air-fuel mixture explodes by ignition of an ignition device provided in the engine 15.

  Further, a crankshaft (not shown) extends rearward from the rear portion of the engine 15. The crankshaft changes the vertical movement of a piston (not shown) due to the explosion of the air-fuel mixture into a rotational motion. An impeller shaft is connected to the crankshaft, and the impeller shaft is connected to a propulsion unit 18 provided at the stern of the hull 10a. The impeller shaft is connected to an impeller (not shown) attached to the inside of the propulsion unit 18 and transmits the rotational force of the crankshaft driven by the engine 15 to the impeller to rotate the impeller.

  The propulsion unit 18 includes a water introduction port 18b that opens to the bottom of the hull 10a and an injection nozzle (not shown) that opens to the stern. The water introduced from the water introduction port 18b is injected by rotation of the impeller. A propulsive force is generated in the hull 10a by spraying from the nozzle. The propulsion unit 18 is attached to the bottom of the stern of the hull 10a in a state separated from the main body side of the hull 10a by a casing (not shown), and the impeller shaft passes through the casing, The propulsion unit 18 extends from the engine 15 side.

  Further, an exhaust device is connected to the engine 15, and this exhaust device is connected to an exhaust pipe (not shown) connected to the engine 15, a water lock 19 connected to the exhaust pipe, and a water lock 19. It is comprised by the other exhaust pipe (not shown) etc. which were made. An upstream exhaust pipe connected to the engine 15 sends combustion gas discharged from the engine 15 to the water lock 19. The water lock 19 communicates with an opening provided in a casing that isolates the propulsion unit 18 from the main body side of the hull 10a through another exhaust pipe positioned on the downstream side, and is fed from the upstream exhaust pipe. The generated combustion gas is discharged to the outside through the downstream exhaust pipe. The water lock 19 prevents external water from flowing back and entering the engine 15 side.

  Further, on both sides of the front side portion of the side surface portion 11b of the hull 11 of the hull 10a, as shown in FIGS. 2 and 4, a pair of stabilizers 20a and 20b as bulging portions according to the present invention are provided. It is mounted symmetrically. FIG. 4 shows a longitudinal section of a portion of the hull 10a to which the stabilizers 20a, 20b are attached, and illustration of each device installed in the hull 10a is omitted. The stabilizers 20a and 20b are formed of a member that is elongated so as to extend in the front-rear direction of the hull 10a, and is curved so that the central portion protrudes slightly downward and outward.

  Further, a step is formed between the front side portion and the rear side portion in the upper part of the stabilizers 20a and 20b so that the rear side portion is lower than the front side portion, whereby the stabilizer 20a, The width in the height direction of the front portion of 20b is slightly larger than the width in the height direction of the rear portion. As shown in FIGS. 1 and 5, the stabilizers 20a and 20b are fixed to the side surface portion 11b via a plurality of bolts 21a and nuts 21b. The lower ends of the stabilizers 20a and 20b are positioned along a curved portion that is displaced upward from the rear side to the front side in the chine 11c of the hull 11. Further, the lower surfaces 22 of the stabilizers 20 a and 20 b are formed on inclined surfaces having substantially the same angle as the inclination of the portion near the side surface portion 11 b in the bottom surface portion 11 a of the hull 11.

  For this reason, the portion of the bottom surface portion 11a near the side surface portion 11b and the lower surfaces 22 of the stabilizers 20a and 20b are arranged so as to be located on substantially the same surface. That is, the portion of the hull 11 to which the stabilizers 20a and 20b are attached is substantially the same as increasing the width of the hull 11. Further, as shown in FIG. 6, the front surfaces 23 of the stabilizers 20 a and 20 b are inclined so as to incline backward and outward at an acute angle with respect to the side surface portion 11 b and are curved so as to protrude slightly outward (forward). It is formed on an inclined surface. The angle between the side surface portion 11b and the front surfaces 23 of the stabilizers 20a, 20b (the angle of the portion indicated by reference symbol a in FIG. 6) is set to 40 degrees.

  As a result, a large water resistance is generated in the stabilizers 20a and 20b when the small planing boat 10 travels at a low speed, or a rapid water resistance is generated in the stabilizer 20a or the stabilizer 20b when the small planing boat 10 turns. The occurrence of splash due to the collision with 20a or stabilizer 20b is prevented. Moreover, the front part side part in the upper surface 24 of the stabilizers 20a and 20b is formed in the inclined surface which inclined below and the acute angle with respect to the side part 11b. The angle between the side surface portion 11b and the upper surface 24 of the stabilizers 20a and 20b (the angle of the portion indicated by the symbol b in FIG. 5, FIG. 5 shows the stabilizer 20a) is set to 40 degrees.

  Further, the rear side portions of the rear surfaces 25 and the upper surface 24 of the stabilizers 20a and 20b are formed as inclined surfaces having an angle close to a right angle with respect to the side surface portion 11b. A gap having a slight width is provided between the upper portions of the front ends of the stabilizers 20a and 20b and the gunnel portion 12a, and the width of the gap gradually increases toward the rear side. The stabilizers 20a and 20b are attached to the front side of the seat 14 and the installation position of the engine 15 which is the center of gravity of the hull 10a, and are installed so that the rear ends thereof are the positions of the seat 14 and the engine 15. ing. Furthermore, the outer side edge portions of the stabilizers 20a and 20b are located outside the side surface portion 11b, and are located inside the outer side edge portion of the gunnel portion 12a.

  Further, a pair of rear sponsons 26a and 26b are mounted symmetrically on both sides of the rear portion of the side surface portion 11b of the hull 11 of the hull 10a as shown in FIG. The rear ponsons 26a and 26b are formed of elongated members whose length in the front-rear direction and the width in the vertical direction are slightly smaller than those of the stabilizers 20a and 20b, and are attached with the longitudinal direction along the front-rear direction of the hull 10a. Yes. The rear sponsons 26a and 26b have a width in the height direction of the rear side portion slightly smaller than the width in the height direction of the front side portion, and gradually become narrower from the front side to the rear side. ing. And the front end part is comprised by the inclination part extended diagonally back toward the downward direction from the upper part, and, thereby, the upper part of the front end part is formed in the pointed shape.

  As shown in FIG. 1 and FIG. 7, the rear sponsons 26 a and 26 b are also fixed to the side surface portion 11 b via a plurality of bolts 21 a and nuts 21 b, and the lower end edge portion is in the vicinity of the chine 11 c of the hull 11. Is located. The lower surfaces 27 of the rear sponsons 26a and 26b are formed in a substantially horizontal plane extending from the side surface portion 11b toward the outside, and a protrusion 27a protruding downward is formed on the outer side edge. For this reason, the lower surfaces 27 of the rear sponsons 26a and 26b can easily grasp water. Further, the front, upper and rear surfaces of the rear sponsons 26a and 26b are each formed as an inclined surface having an angle close to a right angle with respect to the side surface portion 11b. The rear sponsons 26a and 26b are located above the water line when the personal watercraft 10 slides. Submerge.

  In the above configuration, when the driver drives the personal watercraft 10, while gripping the grip of the steering handle 13 with the switch (not shown) installed in the vicinity of the steering handle 13 turned on, A throttle lever (not shown) provided near the grip is moved to the grip side. As a result, the engine 15 is driven according to the operation amount of the throttle lever. In this case, as the throttle lever is moved closer to the grip side, the engine 15 rotates at a higher speed and the small planing boat 10 runs at a higher speed, and as the throttle lever is moved away from the grip, the engine 15 rotates at a lower speed and the small planing boat 10 runs at a lower speed. During this travel, the propulsion device 18 is driven to eject a jet from the injection nozzle.

  In this case, when the personal watercraft 10 starts traveling and is in a trolling state, the stabilizers 20a and 20b and the rear sponsons 26a and 26b are in a state of being immersed in water. As the speed increases and the small planing boat 10 shifts to the sliding state, the front side of the small planing boat 10 is displaced upward so that the stabilizers 20a and 20b are positioned above the water surface. Become. In this state, the stabilizers 20a and 20b do not affect the sliding of the personal watercraft 10. Therefore, the provision of the stabilizers 20a and 20b increases the width of the hull 11 and decreases the speed of the personal watercraft 10. Does not occur. In addition, the rear sponsons 26a and 26b are also positioned above the water surface and do not resist water, so that the vehicle can reliably perform straight running and the driver can perform comfortable driving.

In addition, when turning while sliding, the personal watercraft 10 is tilted so that the one located inside the turning is downward. For example, when the personal watercraft 10 turns left, as shown in FIG. 8, the left side portion of the personal watercraft 10 (the left side portion viewed from the driver, the right side portion in FIG. 8) sinks in water. The right part floats upward. For this reason, since the rear sponson 26a firmly captures water, the small planing boat 10 can maintain a reliable turning state without flowing backward. Also,
The stabilizer 20a also enters water and receives resistance from water. At this time, water below the stabilizer 20a flows as shown by an arrow c in FIG. Further, the water colliding with the front surface 23 of the stabilizer 20a flows from the front surface 23 of the stabilizer 20a toward the lower surface 22 or the rear side of the side surface as indicated by an arrow d in FIG.

  Then, the stabilizer 20a catches the water, so that the small planing boat 10 is improved in turning performance without flowing forward, and the angle of inclination of the front surface 23 of the stabilizer 20a is gentle, so that it is prevented from turning sharply. The Moreover, since the water which flows toward the upper surface 24 side from the front surface 23 of the stabilizer 20a hits the gunnel part 12a and is bounced back, it is prevented from splashing and being applied to the driver. Furthermore, since a suction effect (suction effect) is obtained between the fluid water and the side surface or the lower surface 22 of the stabilizer 20a, the stabilizer 20a can effectively catch water. For this reason, the driver can perform a driving operation with a comfortable ride.

  Thus, in the personal watercraft 10 according to the present embodiment, the stabilizers 20a and 20b and the rear sponson 26a are located in the portion of the side surface portion 11b of the hull 11 that is positioned above the draft line when the personal watercraft 10 slides straight. , 26b. And the lower surface 22 of stabilizer 20a, 20b is formed in the inclined surface which inclines upward toward the outer side from the side part 11b. By this inclined surface, at the time of turning, water is guided so as to flow rearward and obliquely upward on the lower surface 22 of the stabilizer 20a, 20b without being grasped by the lower surface 22 of the stabilizer 20a, 20b. For this reason, even when the stabilizer 20a or the stabilizer 20b is immersed in water at the time of turning, it is possible to prevent the water contact resistance from rapidly increasing and the behavior of the personal watercraft 10 from changing suddenly. As a result, the driver and passengers can obtain a comfortable ride while improving the turning performance of the personal watercraft 10.

  Further, the stabilizers 20a and 20b are located above the water surface when the personal watercraft 10 is traveling straight, so that the water contact resistance is not increased and the speed of the personal watercraft 10 is not reduced. For this reason, a driver | operator and a passenger | crew can obtain comfortable riding comfort also at the time of a straight run. Furthermore, since the stabilizers 20a and 20b are arranged on the front side of the hull 10a, the stabilizers 20a and 20b can be more reliably prevented from coming into contact with the water surface during straight running where the front side of the small planing boat 10 is displaced upward. Can do. In addition, when the small planing boat 10 starts sailing and shifts to running, the time until the stabilizers 20a and 20b come out from the water to the surface of the water can be shortened, thereby stabilizing the stabilizer during low speed sailing. Water resistance due to 20a and 20b can be minimized.

  Further, a portion that is displaced upward from the rear side of the hull 11 toward the front side is formed in the front side portion of the hull 11 so that the lower ends of the stabilizers 20a and 20b are aligned with the portion. When the personal watercraft 10 turns, the stabilizer 20a or the stabilizer 20b starts to contact with the water inclined. As a result, as the inclination of the personal watercraft 10 increases due to turning, the water contact resistance by the stabilizer 20a or the stabilizer 20b gradually increases, and the water contact resistance increases smoothly. Will improve.

  In addition, since there is no step that affects the flow of water between the bottom surface portion 11a and the stabilizers 20a and 20b, turbulence occurs in the water flow from the bottom surface portion 11a toward the stabilizer 20a or the lower surface 22 of the stabilizer 20b during turning. Disappear. As a result, the small planing boat 10 does not generate vibration and behavior that are unpleasant for the driver and passengers, and the ride comfort is further improved. Furthermore, since the angle of the front surface 23 of the stabilizers 20a, 20b with respect to the side surface portion 11b of the hull 11 is set to 40 degrees, the water hitting the stabilizers 20a, 20b from the front can flow smoothly backward. Thereby, the resistance of the water by the stabilizers 20a and 20b when the stabilizers 20a and 20b are submerged at a low speed can be minimized.

  In addition, when turning, it is possible to reduce unnecessary water resistance from the front while ensuring necessary water contact resistance, and ride comfort is improved. Further, since the angle of the front side portion of the upper surface 24 of the stabilizers 20a, 20b with respect to the side surface portion 11b is 40 degrees, the upper surfaces 24 of the stabilizers 20a, 20b are moved when the stabilizers 20a, 20b are submerged at low speed. It is possible to smoothly flow the water flowing beyond the rearward direction, and it is possible to prevent splashing from occurring on the driver and passengers.

  In addition, since the stabilizers 20a and 20b are provided in front of the seat 14, the stabilizers 20a and 20b do not get in the way when a driver or a passenger gets into the small planing boat 10 from the side. become. Further, since the rear portions of the stabilizers 20a and 20b are made thinner, the material constituting the stabilizers 20a and 20b can be reduced correspondingly, and the cost can be reduced. Further, since the rear sponsons 26a and 26b are provided behind the portions of the side surface portion 11b where the stabilizers 20a and 20b are provided, the turning performance of the personal watercraft 10 can be further improved.

  Further, the personal watercraft according to the present invention is not limited to the embodiment described above, and can be implemented with appropriate modifications. For example, in the above-described embodiment, the stabilizers 20a and 20b are fixed to the side surface portion 11b of the hull 11 with bolts 21a and nuts 21b. However, the stabilizers 20a and 20b are formed by integral molding with the hull 11. May be. Further, the structures of the stabilizers 20a and 20b, the inclination angle of each surface, the mounting position, and the like can be appropriately changed and implemented within the technical scope of the present invention. Furthermore, the configuration of the parts other than the parts described above in the personal watercraft can be appropriately changed and implemented within the technical scope of the present invention.

It is the side view which showed the personal watercraft based on one Embodiment of this invention. It is the bottom view which showed the small planing boat. It is the side view which showed each apparatus installed in the inside of a personal watercraft. It is the longitudinal cross-sectional view which showed the small planing boat. It is the fragmentary sectional view which showed the fixation state to the hull of a stabilizer. It is the fragmentary top view which showed the stabilizer attached to the hull. It is the fragmentary sectional view which showed the fixed state to the hull of a rear ponson. It is the longitudinal cross-sectional view which showed the small planing boat at the time of turning. It is explanatory drawing which showed the flow of the water with respect to a stabilizer.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Small planing boat, 10a ... Hull, 11 ... Hull, 11a ... Bottom part, 11b ... Side part, 11c ... Chine, 12 ... Deck, 12a ... Gunnel part, 14 ... Seat, 20a, 20b ... Stabilizer, 22 ... Lower surface, 23 ... front surface, 24 ... upper surface, rear sponsons ... 26a, 26b.

Claims (11)

A small planing boat comprising a hull constituting the lower part of the hull and a deck constituting the upper part of the hull,
The hull is composed of a bottom surface portion and a side surface portion extending upward from an edge of the bottom surface portion, and the small planing is provided on a portion of the side surface portion that is located above the water line when the small planing boat is going straight. When the boat is viewed from the bottom side, a pair of bulging portions extending in the front-rear direction in a state of projecting outward from both sides of the side surface portion are provided symmetrically, and the lower surfaces of the pair of bulging portions are A small planing boat characterized in that it has an inclined surface that inclines upward from the hull side toward the outside.   2. The personal watercraft according to claim 1, wherein a center portion in a longitudinal direction of the pair of bulge portions is positioned forward of a center portion in the front-rear direction of the hull or a center of gravity of the hull.   The personal watercraft according to claim 1 or 2, wherein lower ends of the pair of bulging portions are positioned in the vicinity of a boundary line between the bottom surface portion and the side surface portion.   The inclination angle of both side portions near the side surface portion of the bottom surface portion in the longitudinal cross-sectional shape of the hull of the portion provided with the pair of bulge portions, and the vicinity of both side portions of the bottom surface portion near the side surface portion. The personal watercraft according to any one of claims 1 to 3, wherein an inclination angle of a lower surface of each of the bulging portions arranged is substantially the same.   A portion that is displaced upward from the rear side to the front side of the hull is formed at a boundary line between the bottom surface portion and the side surface portion, and the pair of bulge portions are respectively connected to the hull at the boundary line. The personal watercraft according to any one of claims 1 to 4, wherein the personal watercraft is located in the vicinity of a portion that is displaced upward from the rear side toward the front side.   The front surface of the pair of bulging portions is configured by an inclined surface extending from the portion in contact with the side surface portion so as to incline toward the external rear side at an acute angle with respect to the side surface portion. A small planing boat as described in one.   The at least front side portion on the upper surface of the pair of bulging portions is configured by an inclined surface extending from the portion in contact with the side surface portion so as to incline outwardly downward at an acute angle with respect to the side surface portion. The small planing boat according to any one of 6.   The personal watercraft according to any one of claims 1 to 7, wherein a seating portion on which a passenger sits is provided on the hull, and the pair of bulging portions are provided in front of the seating portion.   A connecting portion between the hull and the deck is provided with a gunnel portion that protrudes outward from the hull, and when the small planing boat is viewed from the bottom side, the bulging portion is positioned inside the gunnel portion. A small planing boat according to any one of claims 1 to 8.   Behind the portion where the bulging portion is provided in the rear portion of the side surface portion, when the small planing boat is going straight ahead, it is positioned above the water line, and when the small planing boat turns, The personal watercraft according to any one of claims 1 to 9, wherein rear sponsons that increase the water contact resistance are provided symmetrically at a position where the inner side of the turn is submerged.   The personal watercraft according to any one of claims 1 to 10, wherein the bulging portion is formed of a member separate from the hull and is detachably attached to the hull.

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