Lightweight hydrofoil for surfboard

Abstract

The utility model discloses a lightweight hydrofoil for a surfboard, which belongs to the technical field of surfboards and comprises a hydrofoil body, and the hydrofoil body comprises a polyurethane carbon fiber foaming core layer serving as a bottom base material and glass and thousand plain carbon fiber prepreg layers symmetrically arranged on two sides of the polyurethane carbon fiber foaming core layer. The polyurethane carbon fiber foaming core layer and the glass and thousand plain carbon fiber prepreg layer are solidified, pressed and tightly connected, the hydrofoil body comprises a hydrofoil front edge and a hydrofoil rear edge, and the structure state of the cross section from the hydrofoil front edge to the hydrofoil rear edge is an inclined plane catering to water flow from high to low. The upper surface of the hydrofoil body is integrally connected with a triangular attack angle part. According to the principle of acting force and counter-acting force, the inclined plane catering to water flow is designed, water flow resistance can be counteracted, lift force and power can be generated, the hydrofoil body made of carbon fibers has certain strength, the weight is light, the manufacturing cost is not high, and application and popularization are easy.

Description

Technical Field

[0001] The utility model belongs to the technical field of surfboards and relates to a lightweight hydrofoil used for a surfboard. Background Art

[0002] A hydrofoil surfboard is a type of water sports equipment that uses the resistance and buoyancy of water to control the board's direction and speed through the shift of a person's weight and center of gravity. The bottom of a hydrofoil surfboard has two raised wings that generate lift in the water, allowing the board to glide across the surface. Hydrofoils are devices attached to a surfboard to provide additional stability and control, allowing the surfer to better control the board's movement across the water.

[0003] In order to generate lift, traditional hydrofoils use thicker flow-facing surfaces, which leads to greater water resistance. In terms of materials, some hydrofoils are made of rigid materials, which are relatively bulky, causing them to sink quickly during underwater activities. Some are made of balsa wood or engineering plastics, which are not strong enough and can be easily broken or deformed by waves. In addition, some hydrofoils on the market are made of composite materials. Although they have better strength than traditional balsa wood or engineering plastics, the manufacturing cost of composite materials is high, which is not conducive to the promotion and use of hydrofoils.

[0004] Therefore, it is necessary to design a hydrofoil that has certain strength, is light in weight, has a lifting effect, and is suitable for surfing. Utility Model Content

[0005] The utility model provides a lightweight hydrofoil for a surfboard, aiming to solve the problems of large water flow resistance in the use of existing hydrofoils, rapid sinking caused by hydrofoils made of rigid materials due to their bulkiness, insufficient strength of hydrofoils made of balsa wood or engineering plastics, and high manufacturing cost of hydrofoils made of composite materials, which are not conducive to the promotion and use of hydrofoils.

[0006] To achieve the above-mentioned objectives, the present invention provides a lightweight hydrofoil for a surfboard, comprising a hydrofoil body, wherein the hydrofoil body includes a polyurethane carbon fiber foam core layer as a base material, and glass-woven carbon fiber prepreg layers symmetrically arranged on both sides of the polyurethane carbon fiber foam core layer, the polyurethane carbon fiber foam core layer and the glass-woven carbon fiber prepreg layers are tightly connected by curing and pressing, the hydrofoil body includes a leading edge and a trailing edge of the hydrofoil, the cross-sectional structural state from the leading edge of the hydrofoil to the trailing edge of the hydrofoil is an inclined surface from high to low that caters to the water flow, and the upper surface of the hydrofoil body is integrally connected with a triangular angle of attack portion.

[0007] Preferably, the hydrofoil body includes side wings, and downwardly curved side wings are symmetrically arranged on both sides of the trailing edge of the hydrofoil, and the leading edge of the hydrofoil and the side wings at both ends are connected in a backward arc shape.

[0008] Preferably, the upper surface of the attack angle portion is a horizontal plane, and an inward-concave positioning strip groove is provided in the middle of the upper surface of the attack angle portion. The upper surface of the attack angle portion is provided with a plurality of screw holes, and the screw holes are located on the outside of the inward-concave positioning strip groove. The lower surface of the hydrofoil body is provided with a plurality of countersunk holes, and the countersunk holes and the screw holes pass through in correspondence.

[0009] The beneficial effects of the utility model compared to the prior art are:

[0010] The utility model provides a lightweight hydrofoil for a surfboard. The hydrofoil body is designed to have an inclined surface that caters to the water flow. According to the principle of action and reaction, it can not only offset the resistance of the water flow, but also enable the hydrofoil body to generate upward lift and forward driving force on the inclined surface. In addition, the hydrofoil body is designed with carbon fiber material, so that the entire hydrofoil body has a certain strength and is not easily damaged by impact. The light weight improves the lift effect, and the production cost is low, which makes it easy to promote and use.

[0011] In order to more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0013] Figure 2 This is a schematic diagram of the three-dimensional structure of the utility model;

[0014] Figure 3 This is a side structural diagram of the present utility model;

[0015] Figure 4 Schematic diagram of the layered structure of the utility model;

[0016] Reference numerals:

[0017] 1. Polyurethane carbon fiber foam core layer; 2. Glass-woven flat carbon fiber prepreg layer; 3. Hydrofoil leading edge; 4. Hydrofoil trailing edge; 5. Attack angle; 6. Side wing; 7. Concave positioning strip groove; 8. Screw hole; 9. Countersunk hole; 10. Hydrofoil body. DETAILED DESCRIPTION

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0019] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0020] To achieve the above object, the present invention provides a lightweight hydrofoil for a surfboard, Figure 1-4 As shown, it includes a hydrofoil body 10, which includes a polyurethane carbon fiber foam core layer 1 as a base material, and glass flat carbon fiber prepreg layers 2 symmetrically arranged on both sides of the polyurethane carbon fiber foam core layer 1, the polyurethane carbon fiber foam core layer 1 and the glass flat carbon fiber prepreg layers 2 are tightly connected by curing and pressing, and the hydrofoil body 10 includes a hydrofoil leading edge 3 and a hydrofoil trailing edge 4, and the cross-sectional structural state from the hydrofoil leading edge 3 to the hydrofoil trailing edge 4 is an inclined surface from high to low that caters to the water flow, and the upper surface of the hydrofoil body 10 is integrally connected with a triangular attack angle portion 5.

[0021] The hydrofoil body 10 includes side wings 6 , and downwardly curved side wings 6 are symmetrically arranged on both sides of the hydrofoil trailing edge 4 , and the hydrofoil leading edge 3 and the side wings 6 at both ends are connected in a backward arc shape.

[0022] Among them, the upper surface of the attack angle part 5 is a horizontal plane, and an inward-concave positioning strip groove 7 is provided in the middle of the upper surface of the attack angle part 5. The upper surface of the attack angle part 5 is provided with a plurality of screw holes 8, and the screw holes 8 are located on the outside of the inward-concave positioning strip groove 7. The lower surface of the hydrofoil body 10 is provided with a plurality of countersunk holes 9, and the countersunk holes 9 pass through correspondingly with the screw holes 8.

[0023] In this embodiment, the hydrofoil body 10 adopts a polyurethane carbon fiber foam core layer 1 with good lightweight properties, and its density is 35kg / m 3, can withstand a certain impact force, ensuring the stability of the hydrofoil body 10 when used in waves; glass thousand plain carbon fiber prepreg layers 2 are symmetrically arranged on both sides of the polyurethane carbon fiber foam core layer 1, and the layer thickness can be set to 2.5mm, which provides additional strength to prevent deformation or damage during use. The cross-section from the leading edge 3 to the trailing edge 4 of the hydrofoil is an inclined surface that caters to the water flow. For example, it can be set to a leading edge height of 8cm and a trailing edge height that gradually decreases to 2.5cm. This design can effectively reduce water flow resistance while increasing lift. A concave positioning strip groove is provided in the middle of the upper surface of the attack angle part 5 for accurately locating the connection position of the hydrofoil body 10 and the surfboard. A number of screw holes 8 are provided around the upper surface of the attack angle part 5 to facilitate users to tighten and lock according to different surfing needs. The design enables the attack angle to vary between 5° and 15° to adapt to the needs of different waters and surfing styles. Downward-curved side wings 6 are symmetrically arranged on both sides of the hydrofoil trailing edge 4. The bending angle of the side wings 6 is about 10° and the length is about 15 cm, which can effectively enhance the lateral stability of the hydrofoil body 10 and effectively avoid side slip during high-speed movement. At the same time, the leading edge 3 of the hydrofoil and the side wings 6 at both ends are connected in a backward arc to ensure smooth water flow and further improve the overall performance of the hydrofoil.

[0024] In this embodiment, the hydrofoil body 10 is manufactured as follows:

[0025] 1. Based on the three-dimensional model of the hydrofoil body 10, a set of steel polyurethane foam core molds and a set of hydrofoil body 10 forming molds are prefabricated. The polyurethane foam core molds are used to produce the semi-finished polyurethane carbon fiber foam core layer 1. The polyurethane carbon fiber foam core layer 1 is placed inside the glass flat weave carbon fiber prepreg layer 2 to reduce the product weight.

[0026] 2. Weigh 240-280 g of polyurethane raw material and pour it into a polyurethane foam core mold coated with a release agent. After closing the mold, place it in a molding press with a pressure set to 1-3 MPa. Foam it fully at 40-50° C., fully mature it at 140-160° C., cool it to room temperature, and demold it. After trimming the shape, obtain a polyurethane carbon fiber foam core layer 1;

[0027] 3. According to the shape of the obtained polyurethane carbon fiber foam core layer 1, cut 10 sheets of glass-thick plain carbon fiber prepreg layers 2 with a size of about 750×350 mm;

[0028] 4. Wrap the cut glass-grained plain carbon fiber prepreg layer 2 on the trimmed polyurethane carbon fiber foam core layer 1 to ensure a smooth surface without wrinkles;

[0029] 5. Place the coated product rough blank into the hydrofoil body 10 molding mold, set the pressure to 2-4 MPa, set the temperature to 130-150°C, and maintain the heat and pressure for 15-20 minutes to complete the curing molding. Use the rapid cooling function of the molding machine to reduce the mold temperature to below 45°C, open the mold and take out the product, trim the burrs to obtain a lightweight hydrofoil product.

[0030] It has the following advantages:

[0031] Low manufacturing cost: The fast-curing polyurethane carbon fiber foam core layer 1 and the glass flat weave carbon fiber prepreg layer 2 are used. Compared with traditional hydrofoils, which generally take more than an hour to form composite materials, the fast-curing glass flat weave carbon fiber prepreg used in the hydrofoil body 10 of this embodiment only takes 15 to 30 minutes to cure. This significantly reduces manufacturing cost and forming time, making it suitable for mass production.

[0032] Lightweight: Using glass-thick plain carbon fiber prepreg as the reinforcement layer and polyurethane carbon fiber foam core material as the base material, while ensuring strength, the weight of the product is reduced.

[0033] Long service life: The hydrofoil body 10 made of carbon fiber has low water absorption, is resistant to seawater corrosion, has high strength and has a long service life.

[0034] In summary, the present invention provides a lightweight hydrofoil for a surfboard. The hydrofoil body 10 is designed to have an inclined surface that caters to the water flow. According to the principle of action and reaction, it can not only offset the resistance of the water flow, but also enable the hydrofoil body 10 to generate upward lift and forward driving force on the inclined surface. In addition, the hydrofoil body 10 is designed with a carbon fiber material, so that the entire hydrofoil body 10 has a certain strength and is not easily damaged by impact. The light weight improves the lift effect, and the low production cost makes it easy to promote and use.

[0035] The above description of the technical principles of the present invention in conjunction with specific embodiments is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions based on the principles of the present invention fall within the scope of protection of the present invention. Those skilled in the art can easily conceive of other specific embodiments of the present invention without inventive effort, and all of them fall within the scope of protection of the present invention.

Claims

1. A lightweight hydrofoil for a surfboard, characterized in that: The hydrofoil body includes a polyurethane carbon fiber foam core layer as a base material, and glass fiber plain carbon fiber prepreg layers symmetrically arranged on both sides of the polyurethane carbon fiber foam core layer. The polyurethane carbon fiber foam core layer and the glass fiber plain carbon fiber prepreg layers are tightly connected by curing and pressing. The hydrofoil body includes a leading edge and a trailing edge of the hydrofoil. The cross-sectional structural state from the leading edge of the hydrofoil to the trailing edge of the hydrofoil is an inclined surface from high to low that caters to the water flow. The upper surface of the hydrofoil body is integrally connected with a triangular angle of attack portion.

2. The lightweight hydrofoil for a surfboard according to claim 1, characterized in that: The hydrofoil body includes side wings, and downwardly curved side wings are symmetrically arranged on both sides of the trailing edge of the hydrofoil. The leading edge of the hydrofoil and the side wings at both ends are connected in a backward arc shape.

3. The lightweight hydrofoil for a surfboard according to claim 1, characterized in that: The upper surface of the attack angle part is a horizontal plane, and an inward-concave positioning strip groove is provided in the middle part of the upper surface of the attack angle part. A plurality of screw holes are provided on the upper surface of the attack angle part, and the screw holes are located on the outside of the inward-concave positioning strip groove. A plurality of countersunk holes are provided on the lower surface of the hydrofoil body, and the countersunk holes and the screw holes pass through in correspondence.

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