EP4695145A1 - Hydrofoil für ein wasserfahrzeug - Google Patents
Hydrofoil für ein wasserfahrzeugInfo
- Publication number
- EP4695145A1 EP4695145A1 EP24719044.0A EP24719044A EP4695145A1 EP 4695145 A1 EP4695145 A1 EP 4695145A1 EP 24719044 A EP24719044 A EP 24719044A EP 4695145 A1 EP4695145 A1 EP 4695145A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- section
- fuselage
- mast
- side walls
- hydrofoil
- 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.)
- Pending
Links
Classifications
-
- 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
- B63B1/16—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving additional lift from hydrodynamic forces
- B63B1/24—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving additional lift from hydrodynamic forces of hydrofoil type
- B63B1/242—Mounting, suspension of the foils
-
- 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
Definitions
- the present invention relates to a hydrofoil for a watercraft, having a mast and a fuselage attached to the mast, which has wings for generating lift, wherein the mast carries at least one pin which is received in a corresponding recess in the fuselage, and whose side walls are at least partially conically tapered in the fastening direction.
- hydrofoils typically consist of a mast attached to the bottom of the watercraft, to the bottom of which is attached a slender, longitudinally extending component called a fuselage, on which the actual wings are attached, which generate the necessary lift and guidance depending on the travel speed.
- US 9,896,158 A discloses a hydrofoil in which the fuselage is attached to the mast via a connection with pins. In this way, it is possible to ensure the exact alignment of the fuselage.
- EP 3 486 159 B shows an alternative solution with pins, whereby the connection is secured by a cylindrical locking body.
- the known solutions have the disadvantage of causing high point loads in the material.
- the screws When countersunk screws are used to secure the connection, the screws also have a centering effect, which can lead to high additional stresses even with small manufacturing tolerances.
- the object of the invention is to avoid these disadvantages and to provide a solution in which the connection between the mast and the fuselage is precise, free of play and resilient, but at the same time causes the lowest possible peak stresses. In particular, ease of use should be ensured.
- the pin has a first section and a second section in the longitudinal direction of the fuselage, and the side walls of the first section and the side walls of the second section have different inclinations in cross-section.
- inclination means the angle that the side walls have in cross-section with respect to a median plane of the mast and the fuselage.
- this angle can be positive, i.e. the side walls taper downwards, it can be zero, i.e. the side walls are parallel to one another, or it can also be negative, i.e. the side walls diverge in a dovetail shape.
- Hydrofoils are usually designed so that the mast exerts a torque on the fuselage, which pushes the tip of the fuselage downwards and the rear area upwards.
- the first section is preferably arranged in front of the second section in the direction of travel and the side walls of the first section are more inclined than the side walls of the second section. This means that the first section is optimally designed to absorb pressure forces.
- This constellation typically occurs in windsurfing.
- the torque can also occur in the opposite direction, so that inclinations other than those described above can also make sense.
- the clearance makes it possible for a projection in the form of a web to be arranged in the recess of the fuselage, which strengthens the structure of the fuselage and thus enables higher mechanical loads. It can also be provided that one edge of the pin forms a projection. In this way, the effect of a torque exerted by the mast on the fuselage can be absorbed without excessive stress on the fastening screws. This allows a corresponding projection on the mast to be gripped under and thus a positive connection to be created that can withstand high loads.
- the projection is arranged at the end of the pin where the torque that typically occurs causes a local tensile force on the fuselage.
- the fuselage is attached to the mast by two screws, which are arranged one behind the other in the first and second sections.
- the fuselage is attached to the mast by one screw, which is arranged exclusively in the area of the second section. In this way, it is possible to spatially decouple the centering on the one hand and the fastening on the other, which results in a more favorable force introduction.
- a particular advantage of this design variant is that the weakening of the structure by the screw holes is minimized.
- a further improvement in the power transmission can be achieved by attaching the fuselage to the mast using a frictional connection.
- the frictional connection can be implemented using a sleeve that can be moved in the longitudinal direction of the fuselage and that encompasses at least one attachment projection on the mast.
- the frictional connection can also include at least one wedge that can be used to fix the fuselage to the mast.
- the tenon has a length of between three and 20 times, and preferably between five and 15 times, the width at its root.
- the width of the first portion at its tip may be between 70% and 90% of the width at its root.
- the invention also relates to a kit for a hydrofoil in which several fuselages with different inclinations of the recess are provided.
- the hydrofoil can be adapted to the respective needs of the user.
- it is essential that the inclination of the fuselage can be adjusted relative to the longitudinal axis of the watercraft without using wedges, shims or the like, which reduce the mechanical strength of the connection.
- Fig. 1 shows an embodiment variant of the invention in an oblique view
- Fig. 2 shows the vehicle of Fig. 1 in a partially exploded view
- Fig. 3 shows a detail A of Fig. 2;
- Fig. 4 shows a detail A from Fig. 1 to Fig. 3 in an oblique view
- Fig. 5 is a longitudinal section of the detail of Fig. 3 and Fig. 4;
- Fig. 6 is a section along line VI - VI in Fig. 5;
- Fig. 7 is a section along line VII - VII in Fig. 5;
- Fig. 8 shows a detail of a fuselage of a second embodiment in an oblique view
- Fig. 9 the detail of Fig. 8 with an inserted section of the mast
- Fig. 10 is a longitudinal section of the detail of Fig. 9;
- FIG. 11 the detail of Fig. 9 and Fig. 10 in a side view
- Fig. 12 is a section along line XII - XII in Fig. 11;
- Fig. 13 is a section along line XIII - XIII in Fig. 11;
- Fig. 14 is a section along line XIV - XIV in Fig. 11;
- Fig. 15 shows a detail of a third embodiment in a representation corresponding to Fig. 10;
- Fig. 16 is a section along line XVI - XVI in Fig. 15;
- Fig. 17 is a section along line XVII - XVII in Fig. 15;
- Fig. 18 shows a detail of a fourth embodiment in a representation corresponding to Fig. 10 and Fig. 15;
- Fig. 19 shows a detail of a fifth embodiment in a representation corresponding to Fig. 10, Fig. 15 and Fig. 18;
- Fig. 20 shows a detail of a sixth embodiment in a representation corresponding to Fig. 4 with the slide in the open position;
- Fig. 21 the detail of Fig. 20 in a plan view
- Fig. 22 the detail of Fig. 20 and Fig. 21 in a section along line XXII -
- FIG. 23 the detail of Fig. 20 to Fig. 22 in a section along line XXIII -
- Fig. 24 the detail of Fig. 20 to Fig. 23 in a side view
- Fig. 25 the detail of Fig. 20 to Fig. 24 in a view from behind;
- Fig. 26 is a section along line XXVI - XXVI in Fig. 25;
- Fig. 27 the detail of Fig. 20 with the slide in closed position
- Fig. 28 shows a detail of a seventh embodiment in a representation corresponding to Fig. 9;
- Fig. 29 the detail of Fig. 28 in a plan view
- Fig. 30 the detail of Fig. 28 and Fig. 29 in a side view
- Fig. 31 the detail of Fig. 28 to Fig. 30 in a longitudinal section
- Fig. 32 a section along line XXXII - XXXII in Fig. 30;
- Fig. 33 is a section along line XXXII - XXXII in Fig. 30.
- Fig. 1 shows a watercraft, namely a surfboard, kiteboard or similar (hereinafter referred to as board), with a hydrofoil.
- the board 5 is equipped with a hydrofoil 6 on its underside, which is composed of a mast 2, a fuselage 1, a front wing 3 and a rear wing 4.
- Fig. 2 shows that the mast 2 has a pin 7 at its lower end, which is intended to be received in a recess 8 of the fuselage 1, which essentially has the negative shape of the pin 7, so that a full-surface force transmission between the pin 7 and the recess 8 is ensured.
- Fig. 4 to Fig. 6 show a first embodiment of the invention in detail.
- the fuselage 1 is secured to the pin 7 of the mast 2 by two screws 10, which are screwed from below through the fuselage 1 into the pin 7.
- the screws 10 are designed as countersunk head screws, so that on the one hand they are flush with the outer surface of the fuselage 1 and on the other hand have a centering effect due to the recessed areas 9 in the outer surface of the fuselage 1.
- a first section 11 which in this embodiment is at the front in the direction of travel, the side walls 11a, 11b of the pin 7 (and thus also of the recess 8) are parallel to one another (see the section in Fig.
- the second embodiment which is shown in Fig. 8 to Fig. 14, differs from the embodiment described above in that the first and second sections 11 and 12 are separated from one another by a clearance 13.
- the clearance 13 has the shape of a wedge-shaped groove which extends in the lower region in the transverse direction of the pin 7.
- a projection 14 corresponding to the clearance 13 is provided, which engages in the clearance 13 in the assembled state.
- the side walls 11a, 11b of the pin 7 in the first section 11 and the side walls 12a, 12b in the second section 12 are inclined at different angles, but here the side walls 11a, 11b in the first section 11 are conically tapered, while the side walls 12a, 12b in the second section 12 are parallel to one another.
- Another special feature of this second embodiment is that the front edge 15 of the pin 7 is positively inclined so that the pin 7 can be easily inserted into the recess 8 of the fuselage 1.
- the rear edge 16, however, is parallel to the longitudinal direction of the mast 2 so that the fit of the rear edge 16 with respect to the recess 8 of the fuselage 1 is independent of any tolerances in the insertion direction.
- the third embodiment which is shown in Fig. 15 to Fig. 17, is largely analogous to the second embodiment, with the difference that here the side walls 11a, 11b in the first section 11 are arranged conically tapering at a small angle, while the side walls 12a, 12b in the second section 12 are inclined at a larger angle to each other.
- the rear edge 16 is negatively inclined, ie the lower end of the edge 16 forms a projection 16a.
- the recess 8 of the fuselage 1 has an undercut at this point.
- the undercut is at the back, since the mast 2 typically exerts a torque in an anti-clockwise direction on the fuselage 1 during normal use, ie the fuselage 1 is pressed downwards at the front while a pulling force is exerted on it at the rear.
- the undercut can thus absorb the forces exerted by the projection 16a at least partially by form-fitting.
- the fifth design variant which is shown in Fig. 19, has, in contrast to the variants described above, an inclined lower edge 17 of the mast 2, so that in the assembled state it is inclined at a small acute angle to a longitudinal axis 19 of the fuselage 1.
- This design makes it possible to create a modular system in which several fuselages 1 with different angles of the lower edge 17 are available, which can be optionally attached to the mast 2. In this way, the orientation of the fuselage 1 and thus of the hydrofoil as a whole can be adjusted depending on the needs of the user. Since there is a tight and full-surface fit between the fuselage 1 and the mast 2 in every case, a connection that can withstand high mechanical loads is always guaranteed.
- a further difference is that only one screw hole 18 is provided here, which is provided in the second section 12, since tensile forces normally occur there.
- Fig. 20 shows a sixth embodiment of the invention, in which the connection between the mast 2 and the fuselage 1 is secured by a sliding sleeve 20 in addition to screws or alternatively to screws.
- the sliding sleeve 20 is in the open state.
- This sliding sleeve 20 is guided in grooves 23 provided laterally in the fuselage 1, and it has a bore 22 through which the sliding sleeve 20 can be secured in the closed state by a screw 21, which is shown in Fig. 27.
- Figs. 22 to 26 show various views and sections for explanation.
- the seventh embodiment variant which is shown in Fig. 28 to Fig. 33, differs from the variants explained above in that the pin 7 of the mast 2 has a first section 11 and a second, undercut section 24.
- the side walls 11a, 11b of the first section 11 are tapered downwards, while the side walls 24a, 24b of the second, undercut section 24 are dovetail-shaped.
- the pin 7 has an enlarged clearance 25 to accommodate the projection 14 and to enable the assembly of the mast 2 and fuselage 1.
- the recess 8 in the fuselage 1 has a recessed area 26 which is located mainly below the undercut section 24, which also serves to enable assembly.
- the present invention makes it possible to realize a robust and rigid hydrofoil that offers high operating comfort.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Steering Devices For Bicycles And Motorcycles (AREA)
- Soil Working Implements (AREA)
- Forklifts And Lifting Vehicles (AREA)
- Pivots And Pivotal Connections (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ATA60062/2023A AT527112B1 (de) | 2023-04-13 | 2023-04-13 | Hydrofoil für ein wasserfahrzeug |
| PCT/AT2024/060122 WO2024211933A1 (de) | 2023-04-13 | 2024-04-08 | Hydrofoil für ein wasserfahrzeug |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4695145A1 true EP4695145A1 (de) | 2026-02-18 |
Family
ID=90731327
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP24719044.0A Pending EP4695145A1 (de) | 2023-04-13 | 2024-04-08 | Hydrofoil für ein wasserfahrzeug |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4695145A1 (de) |
| AT (1) | AT527112B1 (de) |
| WO (1) | WO2024211933A1 (de) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5176096A (en) * | 1990-05-18 | 1993-01-05 | F2 International Ges.M.B.H. | Assembly for fastening a fin to a sailboard |
| US5649846A (en) * | 1995-01-06 | 1997-07-22 | Harper; Derek | Pivotable fin system |
| AU2013204785C1 (en) | 2012-07-09 | 2019-09-05 | Fin Control Systems Pty. Limited | Fin Plug for Water Craft |
| US9085343B2 (en) | 2013-03-14 | 2015-07-21 | Hydrofoiled, Inc. | Universal hydrofoil connector system and method of attachment |
| DE202019103496U1 (de) * | 2019-06-25 | 2019-09-12 | North Kiteboarding Australasia | Hydrofoil zur Befestigung an einem Wassersportbrett |
| DE202019003242U1 (de) * | 2019-08-02 | 2019-08-21 | Lutz Bonhage | Variable Klemmvorrichtung zwischen Mast und Fuselage bei Hydrofoils Wind / Kitesurfer |
-
2023
- 2023-04-13 AT ATA60062/2023A patent/AT527112B1/de active
-
2024
- 2024-04-08 EP EP24719044.0A patent/EP4695145A1/de active Pending
- 2024-04-08 WO PCT/AT2024/060122 patent/WO2024211933A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| AT527112A2 (de) | 2024-10-15 |
| AT527112A3 (de) | 2025-03-15 |
| WO2024211933A1 (de) | 2024-10-17 |
| AT527112B1 (de) | 2025-06-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: UNKNOWN |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
| 17P | Request for examination filed |
Effective date: 20250918 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC ME MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: BRATSCH, CHRISTIAN |
|
| RAP3 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: CREAGLOBE GMBH |