EP2851279A1 - Kite powered vessel having a movable keel - Google Patents
Kite powered vessel having a movable keel Download PDFInfo
- Publication number
- EP2851279A1 EP2851279A1 EP14185936.3A EP14185936A EP2851279A1 EP 2851279 A1 EP2851279 A1 EP 2851279A1 EP 14185936 A EP14185936 A EP 14185936A EP 2851279 A1 EP2851279 A1 EP 2851279A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- keel
- vessel
- rotary
- rotary mechanism
- kite
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B41/00—Drop keels, e.g. centre boards or side boards ; Collapsible keels, or the like, e.g. telescopically; Longitudinally split hinged keels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
- B63B1/02—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
- B63B1/04—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with single hull
- B63B1/042—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with single hull the underpart of which being partly provided with channels or the like, e.g. catamaran shaped
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B32/00—Water sports boards; Accessories therefor
- B63B32/60—Board appendages, e.g. fins, hydrofoils or centre boards
- B63B32/64—Adjustable, e.g. by adding sections, by removing sections or by changing orientation or profile
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H8/00—Sail or rigging arrangements specially adapted for water sports boards, e.g. for windsurfing or kitesurfing
- B63H8/10—Kite-sails; Kite-wings; Control thereof; Safety means therefor
- B63H8/16—Control arrangements, e.g. control bars or control lines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H9/00—Marine propulsion provided directly by wind power
- B63H9/04—Marine propulsion provided directly by wind power using sails or like wind-catching surfaces
- B63H9/06—Types of sail; Constructional features of sails; Arrangements thereof on vessels
- B63H9/069—Kite-sails for vessels
- B63H9/072—Control arrangements, e.g. for launching or recovery
Definitions
- the present invention relates to a kite powered vessel.
- Kite powered vessels are known.
- a kite powered vessel is disclosed in WO2005/100149 .
- kite powered vessels have a poor performance when going to windward. Also, it was recognized that kite-powered vessels are light and can easily be (partly) pulled out of the water when the force on the kite increases.
- kite-powered vessel comprising:
- the present invention allows the keel to be positioned directly opposite to the pulling force of the kite. In other words, the force of the water on the keel opposes the forces of the kite on the vessel.
- the keel when the vessel is in a horizontal orientation, the keel is inclined in both the left and right position when seen in front view of the vessel, wherein the first primary surface faces upwards in both the left and right position, and wherein the second primary surface faces downwards in both the left and right position.
- the first primary surface is concave and the opposite second primary surface is convex, and the concave surface of the keel faces the center.
- the concave side of the keel faces the center of the circle of which the path forms a part.
- a body of water (a volume) is wedged between the primary surface which faces the center and a hull of the vessel.
- the volume may be defined between the concave side and the hull of the vessel.
- the body of water which is present in said volume stabilizes the vessel.
- the volume of water prevents the vessel from being lifted upwards.
- the vessel according to the invention allows the vessel according to the invention to have a stable behaviour. It also allows a high power to weight ratio. In other words, a rather large kite can be used relative to the vessel, because said body of water stabilizes the vessel.
- the high power to weight ratio allows the vessel to be used as a tug boat to tow other vessels or other objects.
- the vessel may also be used to tow fishing nets or other materials which are under water.
- ballast which is outside the vessel.
- ballast tanks are provided inside the vessel, which leads to a large and heavy vessel.
- ballast is created which is outside the vessel. This obviates the need for a large vessel.
- the vessel itself can stay relatively small. Or in other words, a relatively large kite can be used.
- the vessel in particular has good upwind behaviour.
- going upwind is difficult, because the large lateral force of the wind pulls the vessel out of the water.
- the water force on the keel counteracts the lateral force of the wind and keeps the boat in the water.
- the keel exerts a force on the vessel comprising a lateral component and a downward component.
- the keel when seen in front view, is not straight, and is preferably substantially arc-shaped.
- At least a part of said keel when seen in front view, at least a part of said keel extends along said arc-shaped path. In particular substantially the entire keel may extend along said arc-shaped path, when seen in front view.
- the center of the circle is located at a distance from the keel.
- the keel is connected to the hull via at least one rotary mechanism
- the keel is constructed and arranged to be in rotational equilibrium about the longitudinal axis.
- the rotary mechanism comprises a stationary part and a rotary part, wherein the keel is fixed to the rotary part.
- the rotary mechanism comprises:
- the arc-shaped element may be a wheel.
- the rail may be fixed to the deck directly or indirectly.
- the keel is connected to the hull via at least one rotary mechanism which comprises a rail and a slider, and wherein when seen in front view the rail forms an arc.
- the vessel comprises at least one line mount for connecting a kite line to the vessel, wherein the at least one line mount is fixed to the rotary part of the rotary mechanism
- the line mount may be connected to the slider or to a rotary element connecting the keel with the spokes.
- the vessel comprises two rotary mechanisms, one rotary mechanism being positioned relatively forward and one rotary mechanism being positioned relatively to the rear of the vessel, wherein the keel is connected to both rotary mechanisms.
- the vessel comprises a circular rotary mechanism, wherein the rail defines a full circle, and in particular comprising a circular rotary mechanism at the front of the vessel and a circular rotary mechanism at the rear of the vessel.
- the at least one rotary mechanism defines an opening below the deck, wherein the opening is configured to allow a flow of water through said opening when the vessel moves forward.
- the vessel comprises two rotary mechanisms, and wherein each rotary mechanism comprises a left water piercing part and a right water piercing part which pierce the water surface and provide stability to the vessel.
- each rotary mechanism comprises two arc-shaped rails, one left rail which is positioned on the left side of the vessel and one right rail which is positioned on the right side of the vessel.
- the vessel comprises a single rotary mechanism.
- the vessel comprises two parallel hulls and an interconnecting deck.
- the at least one rotary mechanism is connected to the deck via a tilting mechanism configured for tilting the rotary mechanism relative to the deck, thereby adjusting a pitch angle of the keel.
- the keel extends over a horizontal distance and over a vertical distance and wherein the horizontal distance is more than twice the vertical distance.
- the keel is symmetrical about a longitudinal plane extending through the center of the circular path and through a center of the keel.
- the present invention further relates to a method of sailing, comprising:
- the method comprises:
- One of the advantages of the present vessel may be that the overturning moments are lower than in other kite powered vessels.
- the force of the kite is counteracted by the force of the keel (or rather the force of the water on the keel).
- the keel therefore provides a stabilizing force.
- the water which is located above the keel has a certain mass, i.e. inertia.
- inertia In case of a wind gust, the force of the kite may increase quite dramatically.
- the water above the keel prevents the vessel from being lifted by the wind force. This provides improved dynamic behaviour to the vessel.
- the vessel 10 comprises a deck 12 and a keel 14.
- the water line is indicated with reference numeral 90.
- the vessel comprises buoyancy compartments 42 which form two hulls 46, a left hull 46 and a right hull 46.
- the buoyancy compartments 42 are positioned below the deck.
- the buoyancy compartments extend lengthwise of the vessel.
- the keel 14 is connected to the hull via at least one rotary mechanism 30.
- the rotary mechanism comprises a stationary part 6 and a rotary part 7.
- the stationary part is stationary relative to the deck.
- the keel is fixed to the rotary part 7.
- the vessel comprises two rotary mechanisms 30A, 30B.
- One rotary mechanism 30A is positioned relatively forward on the vessel.
- One rotary mechanism 30B is positioned relatively to the rear of the vessel.
- the keel is connected to both rotary mechanisms. The keel extends longitudinally between both rotary mechanisms 30A, 30B.
- Each rotary mechanism 30 comprises two fixed rails 32.
- the fixed rails 32 are provided at the forward ends of hulls 46.
- One rail 32 is provided at the forward end of the left hull and one rail 32 is provided at the forward end of the right hull 46.
- the rails 32 form an arc, more particular a circle.
- the slider slides along the rail.
- the slider 34 is also circular.
- the rotary part 7 of the rotary mechanism has a circular shape and forms a circular slider 34 which slides along both rails 32.
- the keel is fixed to the rotary part 7.
- a same construction is present at the rear of the vessel, where a rotary part 7 forms a slider 34 which slides along rails 32 to make a rotary movement.
- the rails 32 are also arc-shaped but do not form a full circle.
- the rails substantially 32 have the form of a half-circle.
- the keel 14 When seen in front view, the keel 14 is rotatable relative to the hull along a path 16.
- the path 16 has a shape of an arc 27 of a circle 29.
- the keel is rotatable between a left position and a right position.
- the arc-shaped path along which the keel travels may not be a full circle, but only a part of the circle 29.
- the arc shaped path 16 follows the circumference of the circle 29.
- the keel 14 When seen in front view, at least a part of said keel is curved and may extend along said arc-shaped path 16.
- the keel 14 itself therefore may be arc-shaped.
- the curved shape of the keel does not necessarily have the same curvature as the path 16, but for instance may be slightly less curved.
- a concave side of the keel faces a center 18 of the circle 29 of which the path 16 forms a part.
- the center 18 defines the longitudinal axis 5 about which the keel rotates.
- the keel 14 is mounted to rotate between a left position 20 and a right position 22, see figure 6 .
- the keel may also adopt any position in between the left and right position, such as a central position 21.
- a first section 24 of the keel forms an upper part of the keel and a second section 26 of the keel forms a lower part of the keel
- the first section 24 of the keel forms the lower part of the keel
- the second section 26 of the keel forms the upper part of the keel
- the center 18 of the circle is located at a distance 28 from the keel.
- the entire keel is positioned at a distance from the center 18.
- the keel 14 extends over a horizontal distance 100 and over a vertical distance 102.
- the horizontal distance is more than twice the vertical distance.
- the keel 14 is symmetrical about a longitudinal plane 17 which extends through the center 18 of the arc-shaped or circular path 16 and through a center 19 of the keel.
- the skilled person will understand that the longitudinal plane may not be vertical but may be inclined when the keel is positioned
- the keel comprises a first primary surface 35 and a second primary surface 36.
- the first primary surface 35 faces the center 18 in the left position and in the right position.
- the first primary surface is concave, and the second primary surface is convex.
- the surfaces may also be hooked when seen in front view.
- both surfaces 35 and 36 are inclined when seen in front view.
- the first primary surface 35 faces upward and the second primary surface 36 faces downward, at least when the vessel is horizontal.
- the keel 14 is constructed and arranged to be in rotational balance about the longitudinal axis 5. In other words, the resulting force on the keel travels though the center 18 or substantially through said center. In use, the keel 14 therefore does not have a tendency to rotate as a result of the water forces on the keel.
- the rotary mechanisms define an opening 40 below the deck 12.
- the opening is configured to allow a flow of water through said opening when the vessel moves forward.
- a body 41 of water is located between the keel and the hull 46 of the vessel. The body 41 of water provides the stability to the vessel.
- the hulls 46 are both shown with one continuous line 44 and one dashed line 45.
- the continuous lines 44 define the outer sides of the hulls 46, and the dashed lines define the inner sides.
- the keel 14 is also drawn in dashed lines as it is positioned under the deck when seen in top view.
- the hulls 46 may be integrated with the deck 12.
- the rotary part 7 or the keel 14 may comprise a left ballast tank 120A positioned on the left side and a right ballast tank 120B positioned on the right side of the vessel. By controllably ballasting the left and right ballast tank, the keel 14 can be rotated to its target position.
- the deck 12 is connected to two arc-shaped rotary mechanisms 30.
- FIG. 10 different embodiments of the rail 32 and the slider 34 are shown in cross-section.
- the rail 32 is connected to the hull 46 in a fixed manner.
- the rail 32 may be integral with the hull 46.
- the embodiment of figures 1-8 comprises four sets of rails 32 and slider 34 as shown in figure 21 .
- the embodiment of figure 11 is an alternative to the embodiment of figure 10 .
- the rail 32 may have the same height (or length) as the height of the hull 46.
- the rail 32 may be fully circular, so that the slider 34 and the rail 32 form two circles which are slideably arranged.
- the vessel 10 is pulled with a kite via lines 110 via mounts 78, while the keel exerts a force F1 on the vessel which is substantially opposite to a force F2 of the kite.
- the force F1 is created by the body of water 41.
- the force F1 counteracts the force F2.
- the force F2 is drawn separate from the lines 110, but the skilled person will understand that the force F2 is exerted by the lines 110 in concerto.
- the force F1 travels through the center 18.
- the force F2 also travels through the center 18.
- the kite is positioned on the starboard side 112 of the vessel and the keel is positioned on the port side 114.
- the kite is moved from the starboard side to the port side and the keel 14 is moved along the circular path 16 from the port side to the starboard side.
- the mounts 78 are positioned on the circle at 180 degrees from one another. In use, a kite line 110 may be partially submerged. In the embodiment of figure 8 , the mounts 78 are positioned at an angle ⁇ of about 30-70 degrees. In this embodiment, the kite lines do not submerge, or at least substantially less.
- the keel 14 including the rotary part 7 may be freely rotatable relative to the deck 12, so the movement from the left to the right position is caused by the force of the kite itself, and not by a human operator.
- FIG 9 an embodiment is shown with twin hulls 46 without an interconnecting deck 12. Instead the embodiment comprises two single decks 12. Both hulls 46 have an entry 120.
- the rotary mechanisms 30 are substantially the same as in the embodiment of figures 1-8
- a single rotary mechanism 30 is provided.
- the deck forms part of a single hull 46.
- the hull is relatively narrow.
- the rotary mechanism 30 is mounted to the hull via a pivot axis 48.
- the pivot axis extends horizontally from left to right.
- a tilting mechanism 50 is provided with which the rotary mechanism can be tilted about the lateral pivot axis 48 in order to adjust the pitch angle of the keel.
- the tilting mechanism comprises a hydraulic or pneumatic cylinder 51 or a rack and pinion device to tilt the rotary mechanism 30 relative to the deck 12.
- the tilting mechanism may be used as a brake. If the keel 14 is oriented at a downward angle, it will function as a brake. This can be performed by extending the cylinder 51.
- the pivot axis 48 pivots relative to the hull 46 but not relative to the rotary part 7.
- Each pivot axis is connected to the rotary 7 via a rail 32 and slider 34. This will be further explained below with reference to figure 23 and 24 .
- the circular element forms a rotary part 7 of the rotary mechanism 30.
- the keel 14 is fixed to the rotary part via the front part.
- the keel extends rearwards from the rail.
- the keel is broader at the front than at the rear of the keel.
- the keel has an arc-shape.
- the vessel 10 has a bow 60 and a stern 62.
- the pivot axis 48 goes over in the rail 32.
- the circular element forms the slider 34 which slides along the rail 32.
- the vessel has two pivot axes, one on the left side and one on the right side of the vessel which are aligned with one another. Each pivot axis 48 goes over in a rail 32.
- the rail 32 may have a limited height (or length). Alternatively, the rail 32 may be fully circular, so that the slider 34 and the rail 32 form two circles which are slideably arranged.
- the vessel 10 comprises a single rotary mechanism 30 which is positioned at the bow 60 of the vessel.
- the rotary mechanism 30 comprises an axle 70 and spokes 72 which extend radially from the axle 70. Three spokes 72 are provided, but a different number is conceivable.
- the axle is mounted to the hull 46.
- the axle 70 extends longitudinally and may extend substantially horizontally.
- a wheel 74 (or in general rotary element 74) is mounted on the axle 70 in a rotary manner.
- the keel 14 is fixed to the wheel.
- the rotary element 74 connects the keel with the spokes 72.
- FIG. 20 an embodiment is shown wherein two arc-shaped elements 74 are provided, one at the front of the vessel and one at the rear of the vessel.
- Two axles 70 are provided, one at the front of the vessel and one at the rear of the vessel.
- spokes 72 extend upwards beyond the axle and rise out of the water into the air.
- the spokes provide mounts 78 for the kite at the upper ends.
- a beam 82 may be provided between the upper ends for further rigidity.
- a single spoke 72 is provided which connects the keel 14 with the axle 70.
- the keel is rotatable in the direction of arrow 80 relative to the hull 46.
- the vessel further comprises a rudder 56 at the rear of the vessel.
- the hull 46 has a concave bottom 86.
- the hull 46 comprises two downward projecting hull parts 88. In use, the hull parts 88 pierce the water line and provide the buoyancy. The remainder of the hull 46 is positioned above the water line 90 in use.
- the vessel may comprise a left water piercing part 88 and a right water piercing part 88 which pierce the water surface and provide stability to the vessel.
- the wheel 74 rotates relative to the vessel and is connected to the hull 46 via rails 32.
- the wheel 74 forms the rotary part 7.
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Abstract
- a deck (12), and
- a keel (14),
wherein the keel is connected to the deck via at least one rotary mechanism (30), wherein when seen in front view the keel is rotatable relative to the deck between a left position and a right position about a longitudinal axis (5) and along a path (16) which has a shape of an arc (27) of a circle (29), wherein the longitudinal axis (5) is a center (18) of said circle and is located at a distance (28) from the keel.
Description
- The present invention relates to a kite powered vessel. Kite powered vessels are known. A kite powered vessel is disclosed in
WO2005/100149 . - In the present invention, it was recognized that kite powered vessels have a poor performance when going to windward. Also, it was recognized that kite-powered vessels are light and can easily be (partly) pulled out of the water when the force on the kite increases.
- In order to solve at least one of these problems, the invention provides a kite-powered vessel, comprising:
- a deck,
- a keel,
- The present invention allows the keel to be positioned directly opposite to the pulling force of the kite. In other words, the force of the water on the keel opposes the forces of the kite on the vessel.
- In an embodiment, when the vessel is in a horizontal orientation, the keel is inclined in both the left and right position when seen in front view of the vessel, wherein the first primary surface faces upwards in both the left and right position, and wherein the second primary surface faces downwards in both the left and right position.
- In an embodiment, the first primary surface is concave and the opposite second primary surface is convex, and the concave surface of the keel faces the center. The concave side of the keel faces the center of the circle of which the path forms a part.
- In an embodiment, a body of water (a volume) is wedged between the primary surface which faces the center and a hull of the vessel.
- The volume may be defined between the concave side and the hull of the vessel. In use, the body of water which is present in said volume stabilizes the vessel. When a wind gush exerts an upward force on the vessel, the volume of water prevents the vessel from being lifted upwards.
- This allows the vessel according to the invention to have a stable behaviour. It also allows a high power to weight ratio. In other words, a rather large kite can be used relative to the vessel, because said body of water stabilizes the vessel.
- The high power to weight ratio allows the vessel to be used as a tug boat to tow other vessels or other objects. The vessel may also be used to tow fishing nets or other materials which are under water.
- The said body of water forms ballast which is outside the vessel. Normally, ballast tanks are provided inside the vessel, which leads to a large and heavy vessel. In the present invention, ballast is created which is outside the vessel. This obviates the need for a large vessel. Hence, the vessel itself can stay relatively small. Or in other words, a relatively large kite can be used.
- The vessel in particular has good upwind behaviour. In many kite powered boats, going upwind is difficult, because the large lateral force of the wind pulls the vessel out of the water. In the present invention, the water force on the keel counteracts the lateral force of the wind and keeps the boat in the water.
- In use, the keel exerts a force on the vessel comprising a lateral component and a downward component.
- In an embodiment:
- in the left position a first section of the keel forms an upper part of the keel and a second section of the keel forms a lower part of the keel, and
- in the right position the first section of the keel forms the lower part of the keel and the second section of the keel forms the upper part of the keel.
- In an embodiment, when seen in front view, the keel is not straight, and is preferably substantially arc-shaped.
- In an embodiment, when seen in front view, at least a part of said keel extends along said arc-shaped path. In particular substantially the entire keel may extend along said arc-shaped path, when seen in front view.
- In an embodiment, the center of the circle is located at a distance from the keel.
- In an embodiment, the keel is connected to the hull via at least one rotary mechanism
- In an embodiment, the keel is constructed and arranged to be in rotational equilibrium about the longitudinal axis.
- Generally, the rotary mechanism comprises a stationary part and a rotary part, wherein the keel is fixed to the rotary part.
- In an embodiment, the rotary mechanism comprises:
- at least one rail, the rail being stationary relative to the deck, and a slider which is moveably arranged on said rail, wherein when seen in front view the rail and the slider have an arc-shape, and wherein the keel is mounted to said slider, or
- a rotary axle, wherein the keel is connected to said axle via one or more spokes.
- The arc-shaped element may be a wheel. The rail may be fixed to the deck directly or indirectly.
- In an embodiment, the keel is connected to the hull via at least one rotary mechanism which comprises a rail and a slider, and wherein when seen in front view the rail forms an arc.
- In an embodiment, the vessel comprises at least one line mount for connecting a kite line to the vessel, wherein the at least one line mount is fixed to the rotary part of the rotary mechanism
- The line mount may be connected to the slider or to a rotary element connecting the keel with the spokes.
- In an embodiment, the vessel comprises two rotary mechanisms, one rotary mechanism being positioned relatively forward and one rotary mechanism being positioned relatively to the rear of the vessel, wherein the keel is connected to both rotary mechanisms.
- In an embodiment, the vessel comprises a circular rotary mechanism, wherein the rail defines a full circle, and in particular comprising a circular rotary mechanism at the front of the vessel and a circular rotary mechanism at the rear of the vessel.
- In an embodiment, in front view the at least one rotary mechanism defines an opening below the deck, wherein the opening is configured to allow a flow of water through said opening when the vessel moves forward.
- In an embodiment, the vessel comprises two rotary mechanisms, and wherein each rotary mechanism comprises a left water piercing part and a right water piercing part which pierce the water surface and provide stability to the vessel.
- In an embodiment, each rotary mechanism comprises two arc-shaped rails, one left rail which is positioned on the left side of the vessel and one right rail which is positioned on the right side of the vessel.
- In an embodiment, the vessel comprises a single rotary mechanism.
- In an embodiment, the vessel comprises two parallel hulls and an interconnecting deck.
- In an embodiment, the at least one rotary mechanism is connected to the deck via a tilting mechanism configured for tilting the rotary mechanism relative to the deck, thereby adjusting a pitch angle of the keel.
- In an embodiment, the keel extends over a horizontal distance and over a vertical distance and wherein the horizontal distance is more than twice the vertical distance.
- In an embodiment, the keel is symmetrical about a longitudinal plane extending through the center of the circular path and through a center of the keel.
- The present invention further relates to a method of sailing, comprising:
- providing the kite-powered vessel according to the invention, and
- pulling the vessel with a kite, wherein the water exerts a force (F1) on the keel which is substantially opposite to a force (F2) exerted by the kite on the vessel.
- In an embodiment of the method, the method comprises:
- positioning the kite on the starboard side of the vessel and positioning the keel on the port side,
- tacking or jibing the vessel, thereby moving the kite from the starboard side to the port side and rotating the keel along the circular path from the port side to the starboard side.
- One of the advantages of the present vessel may be that the overturning moments are lower than in other kite powered vessels. When the kite is on starboard and the keel is on port, the force of the kite is counteracted by the force of the keel (or rather the force of the water on the keel). The keel therefore provides a stabilizing force.
- Further, the water which is located above the keel has a certain mass, i.e. inertia. In case of a wind gust, the force of the kite may increase quite dramatically. The water above the keel prevents the vessel from being lifted by the wind force. This provides improved dynamic behaviour to the vessel.
- Embodiments of the feeder device according to the invention will be described by way of example only, with reference to the accompanying schematic drawings in which corresponding reference symbols indicate corresponding parts, and in which:
-
Figure 1 shows an isometric view of an embodiment of the invention. -
Figure 2 shows a top view of the embodiment offigure 1 . -
Figure 3 shows a side view of another embodiment of the invention. -
Figure 4 shows a cross-section along the line A - A shown infigure 3 . -
Figure 5 shows a cross-section along the line B - B shown infigure 3 . -
Figure 6 shows a front view of the embodiment offigure 1 with different positions of the keel. -
Figure 7 shows a front view of the embodiment offigure 1 with the kite lines. -
Figure 8 shows a front view of the embodiment offigure 1 with different kite line mounts. -
Figure 9 shows an isometric view of another embodiment of the invention. -
Figure 10 shows a cross section of an embodiment of a rotary mechanism of the embodiment offigures 1-8 and the embodiment offigure 9 . -
Figure 11 shows a cross section of another embodiment of the rotary mechanism of the embodiment offigures 1-8 and the embodiment offigure 9 . -
Figure 12 shows a top view of another embodiment of the invention. -
Figure 13 shows a side view of the embodiment offigure 12 . -
Figure 14 shows an isometric view of the embodiment offigure 12 . -
Figure 15 shows a cross-section of a rotary mechanism in the embodiment offigures 12 -14 -
Figure 14 shows a cross-section of another embodiment of a rotary mechanism in the embodiment offigures 12-14 . -
Figure 17 shows an isometric view of another embodiment. -
Figure 18 shows a side view of the embodiment offigure 17 . -
Figure 19 shows a front view of the embodiment offigure 17 . -
Figure 20 shows a side view of another embodiment. -
Figure 21 shows a front view of the embodiment offigure 20 . -
Figure 22 shows a side view of another embodiment. -
Figure 23 shows a top view of the embodiment offigure 22 . -
Figure 24 shows a front view of the embodiment offigure 22 . - Turning to
figures 1 - 2 , a first embodiment of the kite poweredvessel 10 according to the invention is shown. Thevessel 10 comprises adeck 12 and akeel 14. The water line is indicated withreference numeral 90. The vessel comprises buoyancy compartments 42 which form twohulls 46, aleft hull 46 and aright hull 46. The buoyancy compartments 42 are positioned below the deck. The buoyancy compartments extend lengthwise of the vessel. - The
keel 14 is connected to the hull via at least onerotary mechanism 30. The rotary mechanism comprises astationary part 6 and arotary part 7. The stationary part is stationary relative to the deck. The keel is fixed to therotary part 7. - In the embodiment of
figures 1 - 2 , the vessel comprises tworotary mechanisms rotary mechanism 30A is positioned relatively forward on the vessel. Onerotary mechanism 30B is positioned relatively to the rear of the vessel. The keel is connected to both rotary mechanisms. The keel extends longitudinally between bothrotary mechanisms - Each
rotary mechanism 30 comprises two fixedrails 32. The fixed rails 32 are provided at the forward ends ofhulls 46. Onerail 32 is provided at the forward end of the left hull and onerail 32 is provided at the forward end of theright hull 46. - In front view, the
rails 32 form an arc, more particular a circle. The slider slides along the rail. Theslider 34 is also circular. Therotary part 7 of the rotary mechanism has a circular shape and forms acircular slider 34 which slides along both rails 32. The keel is fixed to therotary part 7. - A same construction is present at the rear of the vessel, where a
rotary part 7 forms aslider 34 which slides alongrails 32 to make a rotary movement. - Turning to
figures 3 - 6 , an embodiment is shown which is similar to the embodiment offigures 1 and 2 in most aspect. Therails 32 are also arc-shaped but do not form a full circle. The rails substantially 32 have the form of a half-circle. - When seen in front view, the
keel 14 is rotatable relative to the hull along apath 16. Thepath 16 has a shape of anarc 27 of acircle 29. The keel is rotatable between a left position and a right position. The arc-shaped path along which the keel travels may not be a full circle, but only a part of thecircle 29. The arc shapedpath 16 follows the circumference of thecircle 29. - When seen in front view, at least a part of said keel is curved and may extend along said arc-shaped
path 16. Thekeel 14 itself therefore may be arc-shaped. In front view, the curved shape of the keel does not necessarily have the same curvature as thepath 16, but for instance may be slightly less curved. - A concave side of the keel faces a
center 18 of thecircle 29 of which thepath 16 forms a part. Thecenter 18 defines thelongitudinal axis 5 about which the keel rotates. - The
keel 14 is mounted to rotate between aleft position 20 and aright position 22, seefigure 6 . The keel may also adopt any position in between the left and right position, such as acentral position 21. - In the
left position 20, afirst section 24 of the keel forms an upper part of the keel and asecond section 26 of the keel forms a lower part of the keel, and in theright position 22 thefirst section 24 of the keel forms the lower part of the keel and thesecond section 26 of the keel forms the upper part of the keel. - The
center 18 of the circle is located at adistance 28 from the keel. The entire keel is positioned at a distance from thecenter 18. - The
keel 14 extends over ahorizontal distance 100 and over avertical distance 102. The horizontal distance is more than twice the vertical distance. - Turning to
figure 6 , thekeel 14 is symmetrical about alongitudinal plane 17 which extends through thecenter 18 of the arc-shaped orcircular path 16 and through acenter 19 of the keel. The skilled person will understand that the longitudinal plane may not be vertical but may be inclined when the keel is positioned - Turning to
figure 4 , the keel comprises a firstprimary surface 35 and a secondprimary surface 36. The firstprimary surface 35 faces thecenter 18 in the left position and in the right position. - The first primary surface is concave, and the second primary surface is convex. The surfaces may also be hooked when seen in front view.
- When the vessel is horizontal, both
surfaces primary surface 35 faces upward and the secondprimary surface 36 faces downward, at least when the vessel is horizontal. - The
keel 14 is constructed and arranged to be in rotational balance about thelongitudinal axis 5. In other words, the resulting force on the keel travels though thecenter 18 or substantially through said center. In use, thekeel 14 therefore does not have a tendency to rotate as a result of the water forces on the keel. - in front view the rotary mechanisms define an
opening 40 below thedeck 12. The opening is configured to allow a flow of water through said opening when the vessel moves forward. Furthermore in use abody 41 of water is located between the keel and thehull 46 of the vessel. Thebody 41 of water provides the stability to the vessel. - Turning to
figure 2 , thehulls 46 are both shown with onecontinuous line 44 and one dashedline 45. Thecontinuous lines 44 define the outer sides of thehulls 46, and the dashed lines define the inner sides. Thekeel 14 is also drawn in dashed lines as it is positioned under the deck when seen in top view. - The
hulls 46 may be integrated with thedeck 12. - The
rotary part 7 or thekeel 14 may comprise a left ballast tank 120A positioned on the left side and aright ballast tank 120B positioned on the right side of the vessel. By controllably ballasting the left and right ballast tank, thekeel 14 can be rotated to its target position. - The
deck 12 is connected to two arc-shapedrotary mechanisms 30. - Turning to
figures 10 and 11 , different embodiments of therail 32 and theslider 34 are shown in cross-section. Therail 32 is connected to thehull 46 in a fixed manner. Therail 32 may be integral with thehull 46. The embodiment offigures 1-8 comprises four sets ofrails 32 andslider 34 as shown infigure 21 . The embodiment offigure 11 is an alternative to the embodiment offigure 10 . - In
figures 10 and 11 , the forward end of thehull 46 is shown which goes over in therail 32. Theslider 34 slides along therail 32. - The
rail 32 may have the same height (or length) as the height of thehull 46. Alternatively, therail 32 may be fully circular, so that theslider 34 and therail 32 form two circles which are slideably arranged. - Turning to
figures 7 and 8 , in use, thevessel 10 is pulled with a kite vialines 110 viamounts 78, while the keel exerts a force F1 on the vessel which is substantially opposite to a force F2 of the kite. The force F1 is created by the body ofwater 41. The force F1 counteracts the force F2. The force F2 is drawn separate from thelines 110, but the skilled person will understand that the force F2 is exerted by thelines 110 in concerto. The force F1 travels through thecenter 18. The force F2 also travels through thecenter 18. - During sailing the kite is positioned on the
starboard side 112 of the vessel and the keel is positioned on the port side 114. When the vessel tacks or jibes, the kite is moved from the starboard side to the port side and thekeel 14 is moved along thecircular path 16 from the port side to the starboard side. - In the embodiment of
figure 7 , themounts 78 are positioned on the circle at 180 degrees from one another. In use, akite line 110 may be partially submerged. In the embodiment offigure 8 , themounts 78 are positioned at an angle α of about 30-70 degrees. In this embodiment, the kite lines do not submerge, or at least substantially less. - The
keel 14 including therotary part 7 may be freely rotatable relative to thedeck 12, so the movement from the left to the right position is caused by the force of the kite itself, and not by a human operator. - Turning to
figure 9 , an embodiment is shown withtwin hulls 46 without an interconnectingdeck 12. Instead the embodiment comprises twosingle decks 12. Bothhulls 46 have anentry 120. Therotary mechanisms 30 are substantially the same as in the embodiment offigures 1-8 - Turning to
figures 12, 13 and14 , a second embodiment is shown. In this embodiment, asingle rotary mechanism 30 is provided. The deck forms part of asingle hull 46. The hull is relatively narrow. Therotary mechanism 30 is mounted to the hull via apivot axis 48. The pivot axis extends horizontally from left to right. Atilting mechanism 50 is provided with which the rotary mechanism can be tilted about thelateral pivot axis 48 in order to adjust the pitch angle of the keel. The tilting mechanism comprises a hydraulic orpneumatic cylinder 51 or a rack and pinion device to tilt therotary mechanism 30 relative to thedeck 12. - The tilting mechanism may be used as a brake. If the
keel 14 is oriented at a downward angle, it will function as a brake. This can be performed by extending thecylinder 51. - The
pivot axis 48 pivots relative to thehull 46 but not relative to therotary part 7. Each pivot axis is connected to therotary 7 via arail 32 andslider 34. This will be further explained below with reference tofigure 23 and24 . - In this embodiment, the circular element forms a
rotary part 7 of therotary mechanism 30. Thekeel 14 is fixed to the rotary part via the front part. The keel extends rearwards from the rail. The keel is broader at the front than at the rear of the keel. In front view, the keel has an arc-shape. - The
vessel 10 has abow 60 and a stern 62. - Turning to
figures 15 and 16 , therotary mechanism 30 of the embodiment offigures 10-12 is shown in more detail. Thepivot axis 48 goes over in therail 32. The circular element forms theslider 34 which slides along therail 32. The vessel has two pivot axes, one on the left side and one on the right side of the vessel which are aligned with one another. Eachpivot axis 48 goes over in arail 32. - The
rail 32 may have a limited height (or length). Alternatively, therail 32 may be fully circular, so that theslider 34 and therail 32 form two circles which are slideably arranged. - Turning to
figures 17 ,18 and 19 another embodiment is shown. In this embodiment, thevessel 10 comprises asingle rotary mechanism 30 which is positioned at thebow 60 of the vessel. - The
rotary mechanism 30 comprises anaxle 70 andspokes 72 which extend radially from theaxle 70. Threespokes 72 are provided, but a different number is conceivable. The axle is mounted to thehull 46. Theaxle 70 extends longitudinally and may extend substantially horizontally. - A wheel 74 (or in general rotary element 74) is mounted on the
axle 70 in a rotary manner. Thekeel 14 is fixed to the wheel. Therotary element 74 connects the keel with thespokes 72. - Turning to
figures 20 and 21 , an embodiment is shown wherein two arc-shapedelements 74 are provided, one at the front of the vessel and one at the rear of the vessel. Twoaxles 70 are provided, one at the front of the vessel and one at the rear of the vessel. - In this embodiment the
spokes 72 extend upwards beyond the axle and rise out of the water into the air. The spokes provide mounts 78 for the kite at the upper ends. Abeam 82 may be provided between the upper ends for further rigidity. - In another embodiment, a
single spoke 72 is provided which connects thekeel 14 with theaxle 70. - The keel is rotatable in the direction of arrow 80 relative to the
hull 46. The vessel further comprises arudder 56 at the rear of the vessel. - Turning to
figures 22, 23 and24 , another embodiment is shown. Thehull 46 has aconcave bottom 86. Thehull 46 comprises two downward projectinghull parts 88. In use, thehull parts 88 pierce the water line and provide the buoyancy. The remainder of thehull 46 is positioned above thewater line 90 in use. - The vessel may comprise a left
water piercing part 88 and a rightwater piercing part 88 which pierce the water surface and provide stability to the vessel. - The
wheel 74 rotates relative to the vessel and is connected to thehull 46 via rails 32. Thewheel 74 forms therotary part 7. - As required, detailed embodiments of the present invention are disclosed herein; however, it is to be understood that the disclosed embodiments are merely exemplary of the invention, which can be embodied in various forms. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present invention in virtually any appropriately detailed structure. Further, the terms and phrases used herein are not intended to be limiting, but rather, to provide an understandable description of the invention.
- The terms "a" or "an", as used herein, are defined as one or more than one. The term plurality, as used herein, is defined as two or more than two. The term another, as used herein, is defined as at least a second or more. The terms including and/or having, as used herein, are defined as comprising (i.e., open language, not excluding other elements or steps). Any reference signs in the claims should not be construed as limiting the scope of the claims or the invention.
- The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
Claims (15)
- Kite-powered vessel (10), comprising:- a deck (12), and- a keel (14),
wherein the keel is connected to the deck via at least one rotary mechanism (30), wherein when seen in front view of the vessel the keel is rotatable relative to the deck between a left position and a right position about a longitudinal axis (5) and along a path (16) which has a shape of an arc (27) of a circle (29), wherein the longitudinal axis (5) is a center (18) of said circle and is located at a distance (28) from the keel, wherein the keel has a first primary surface (35) and a second primary surface (36) which are located on opposite sides of the keel, wherein the first primary surface (35) faces the center (18) in both the left and right position. - Vessel according to claim 1, wherein when the vessel is in a horizontal orientation, the keel is inclined in both the left and right position when seen in front view of the vessel, and wherein the first primary surface faces upwards in both the left and right position, and wherein the second primary surface faces downwards in both the left and right position, and wherein a body (41) of water is wedged between the primary surface which faces the center and a hull (46) of the vessel and wherein:in the left position a first section (24) of the keel forms an upper part of the keel and a second section (26) of the keel (14) forms a lower part of the keel, andin the right position the first section (24) of the keel forms the lower part of the keel and the second section (26) of the keel forms the upper part of the keel.
- Vessel according to claim 1 or 2, wherein the first primary surface is concave and the opposite second primary surface is convex, and wherein the concave surface of the keel faces the center (18).
- Vessel according to any of the preceding claims, wherein when seen in front view of the vessel, the keel is not straight, and is preferably substantially arc-shaped.
- Vessel according to any of the preceding claims, wherein when seen in front view, at least a part of said keel extends along said arc-shaped path, wherein in particular substantially the entire keel extends along said arc-shaped path.
- Vessel according to any of the preceding claims, wherein the keel is freely rotatable relative to the deck (12), and/or wherein the rotary mechanism comprises a stationary part (6) and a rotary part (7), wherein the keel is fixed to the rotary part.
- Vessel according to any of the preceding claims, wherein the rotary mechanism comprises:- at least one rail (32), the rail being stationary relative to the deck, and a slider (34) which is moveably arranged on said rail, wherein when seen in front view the rail and the slider have an arc-shape, and wherein the keel is mounted to said slider, or- a rotary axle (70), wherein the keel is connected to said axle via one or more spokes (72).
- Vessel according to any of the preceding claims, comprising two rotary mechanisms (30), one rotary mechanism being positioned relatively forward on the vessel and one rotary mechanism being positioned relatively to the rear of the vessel, wherein the keel is connected to both rotary mechanisms, and/or the vessel comprising at least one line mount (78) for connecting a kite line to the vessel, wherein the at least one line mount is fixed to the rotary part (7) of the rotary mechanism, and wherein the line mount is connected:- to the slider (34) or- to a rotary element (74) connecting the keel with spokes (72).
- Vessel according to any of the preceding claims, comprising a rotary mechanism which defines a full circle, and in particular comprising a circular rotary mechanism at the front of the vessel and a circular rotary mechanism at the rear of the vessel, and wherein in particular in front view the slider (34) has a substantially annular shape, in particular a circular shape
and/or.
wherein in front view the at least one rotary mechanism defines an opening (40) below the deck (12), wherein the opening is configured to allow a flow of water through said opening when the vessel moves forward. - Vessel according to any of the preceding claims, wherein the vessel comprises two rotary mechanisms, and wherein each rotary mechanism comprises a left water piercing part and a right water piercing part which pierce the water surface and provide stability to the vessel,
and/or
wherein each rotary mechanism comprises two arc-shaped rails (32), one left rail which is positioned on the left side of the vessel and one right rail which is positioned on the right side of the vessel. - Vessel according to any of the preceding claims, comprising a single rotary mechanism.
- Vessel according to any of claims 8 - 17, wherein the least one rotary mechanism is connected to the deck via a tilting mechanism (50) configured for tilting the rotary mechanism relative to the deck, thereby adjusting a pitch angle of the keel, and/or wherein the keel extends over a horizontal distance (100) and over a vertical distance (102) and wherein the horizontal distance is more than twice the vertical distance.
- Vessel according to any of the preceding claims, wherein the keel is symmetrical about a longitudinal plane (17) extending through the center (18) of the arc-shaped or circular path (16) and through a center (18) of the keel, and/or wherein the slider and the rail form two circles which are slideably arranged and/or wherein the rotary part (7) of the rotary mechanism comprises a left ballast tank and a right ballast tank.
- Method of sailing, comprising:- providing the kite-powered vessel of claim 1, and- pulling the vessel with a kite, wherein the water exerts a force (F1) on the keel which is substantially opposite to a force (F2) exerted by the kite on the vessel.
- Method according to claim 15, comprising:- positioning the kite on the starboard side (112) of the vessel and positioning the keel on the port side (114),- tacking or jibing the vessel, thereby moving the kite from the starboard side to the port side and rotating the keel along the circular path from the port side to the starboard side.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL2011490A NL2011490C2 (en) | 2013-09-23 | 2013-09-23 | Kite powered vessel having a movable keel. |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2851279A1 true EP2851279A1 (en) | 2015-03-25 |
Family
ID=50031452
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14185936.3A Withdrawn EP2851279A1 (en) | 2013-09-23 | 2014-09-23 | Kite powered vessel having a movable keel |
Country Status (2)
Country | Link |
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EP (1) | EP2851279A1 (en) |
NL (1) | NL2011490C2 (en) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR355247A (en) * | 1905-06-15 | 1905-10-26 | Demetru Radulescu | Unsinkable boat |
US3972300A (en) * | 1974-05-28 | 1976-08-03 | Adamski Leo J | Sailing craft |
FR2518489A1 (en) * | 1981-12-22 | 1983-06-24 | Cocagne Jean Jacques | Movable keel for sailing boat - is concave on inboard side and has accommodation for ballast |
US4686922A (en) * | 1986-06-27 | 1987-08-18 | Burroughs Ralph B | Swing wing keel |
DE4340028A1 (en) * | 1993-11-24 | 1995-06-01 | Zuehlke Ernst W Dipl Ing Fh | Windward-travel system for sailing vessel |
WO2005100149A1 (en) | 2004-04-19 | 2005-10-27 | Skysails Gmbh & Co. Kg | Watercraft comprising a free-flying kite-type wind-attacked element as a wind-powered drive unit |
WO2011095178A1 (en) * | 2010-02-02 | 2011-08-11 | Voegler Ingo | Water vehicle having a profiled element arranged on the bow side |
-
2013
- 2013-09-23 NL NL2011490A patent/NL2011490C2/en not_active IP Right Cessation
-
2014
- 2014-09-23 EP EP14185936.3A patent/EP2851279A1/en not_active Withdrawn
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR355247A (en) * | 1905-06-15 | 1905-10-26 | Demetru Radulescu | Unsinkable boat |
US3972300A (en) * | 1974-05-28 | 1976-08-03 | Adamski Leo J | Sailing craft |
FR2518489A1 (en) * | 1981-12-22 | 1983-06-24 | Cocagne Jean Jacques | Movable keel for sailing boat - is concave on inboard side and has accommodation for ballast |
US4686922A (en) * | 1986-06-27 | 1987-08-18 | Burroughs Ralph B | Swing wing keel |
DE4340028A1 (en) * | 1993-11-24 | 1995-06-01 | Zuehlke Ernst W Dipl Ing Fh | Windward-travel system for sailing vessel |
WO2005100149A1 (en) | 2004-04-19 | 2005-10-27 | Skysails Gmbh & Co. Kg | Watercraft comprising a free-flying kite-type wind-attacked element as a wind-powered drive unit |
WO2011095178A1 (en) * | 2010-02-02 | 2011-08-11 | Voegler Ingo | Water vehicle having a profiled element arranged on the bow side |
Also Published As
Publication number | Publication date |
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NL2011490C2 (en) | 2015-03-24 |
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