# US 10,118,668 B2 · Self-propelling hydrofoil device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,118,668 B2 - Document ID: US10118668B2 - Status: Granted - Kind: B2 - Application number: 15/679,149 - Filed: 2017-08-16 - Published: 2018-02-22 - Granted: 2018-11-06 - Earliest claimed: 2016-08-17 - Applicants: Markus Dombois - Inventors: Markus Dombois - Web page: https://patentgrep.com/patent/US10118668B2 ## CPC - B63B 1/286: {using flaps} - B63B 1/242: {Mounting, suspension of the foils (B63B1/30 takes precedence)} - B63B 32/62: characterised by the material, e.g. laminated materials; characterised by their manufacturing process - B63B 32/64: Adjustable, e.g. by adding sections, by removing sections or by changing orientation or profile - B63B: SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING (arrangements of vessel ventilation, heating, cooling, or air-conditioning B63J2/00; floating substructures as supports of dredgers or soil-shifting machines E02F9/06) ## Abstract The present disclosure provides generally for a hydrofoil system that may allow a surfboard to glide above the water surface. According to the present disclosure, a rider may be able to manipulate a hydrofoil device attached to a surfboard with limited training and athletic ability. The present disclosure provides for a hydrofoil system that may allow riders to use a light leaning motion to adjust the angle of a front wing to create forward thrust to produce a flow for creating lift. In some aspects, the front wing may tilt to reduce downward drag force in a lifting phase while locking into place during a glide to provide a sustained lift of the paddleboard out of the water. ## Claims ### Claim 1 A hydrofoil device comprising: a front wing comprising: a convex upper surface, a concave lower surface, a front wing curved leading edge; a back wing comprising: an upper surface, a lower surface, a back wing curved leading edge; a fuselage comprising: an elongate body with a recess on a forward portion of the elongate body, wherein the front wing fits within the recess and is connected to a forward portion of the elongate body within the recess and the back wing is connected to an aft portion of the elongate body, a front hinge connecting a portion of one or both the convex upper surface and the front wing curved leading edge to the recess, wherein the front hinge allows the front wing to pivot within a predefined range; and a strut connected perpendicular to the elongate body, wherein the strut is connectable to a surfboard. ### Claim 2 (depends on 1) The device of claim 1, wherein the back wing further comprises a back hinge. ### Claim 3 (depends on 2) The device of claim 2, wherein the back hinge is manually adjustable to control an angle of the back wing to the fuselage. ### Claim 4 (depends on 2) The device of claim 2, wherein the back hinge allows the back wing to fluctuate within a predefined angle range of the back wing to the fuselage depending on one or both a position or motion of the hydrofoil device within water. ### Claim 5 (depends on 1) The device of claim 1, wherein the front wing comprises flexible hydrons. ### Claim 6 (depends on 1) The device of claim 1, wherein at least a portion of the hydrofoil device comprises a buoyant material. ### Claim 7 (depends on 1) The device of claim 1, wherein the fuselage comprises a carbon fiber. ### Claim 8 (depends on 1) The device of claim 1, wherein at least a portion of one or both the front wing and the back wing comprise a semi-flexible material. ### Claim 9 (depends on 1) The device of claim 1, wherein the back wing comprises a concave upper surface and a convex lower surface. ### Claim 10 A hydrofoil system comprising: a surfboard; a hydrofoil device comprising: a front wing comprising: a convex upper surface, a concave lower surface, a front wing curved leading edge; a back wing comprising: an upper surface, a lower surface, a back wing curved leading edge; a fuselage comprising: an elongate body with a recess on a forward portion of the elongate body, wherein the front wing fits within the recess and is connected to a forward portion of the elongate body within the recess and the back wing is connected to an aft portion of the elongate body, a front hinge connecting a portion of one or both the convex upper surface and the front wing curved leading edge to the recess, wherein the front hinge allows the front wing to pivot within a predefined range; and a strut connected perpendicular to the elongate body; and a base connecting the strut to the surfboard, wherein the strut connects perpendicular to the surfboard. ### Claim 11 (depends on 10) The system of claim 10, wherein the strut further comprises a strut hinge mechanism that connects the strut to the fuselage. ### Claim 12 (depends on 11) The system of claim 11, wherein the base of the strut comprises a saddle shape. ### Claim 13 (depends on 10) The system of claim 10, wherein the surfboard comprises a foam. ### Claim 14 (depends on 10) The system of claim 10, wherein the surfboard comprises a stand-up paddleboard. ### Claim 15 (depends on 10) The system of claim 10, wherein the surfboard comprises one or more channels located at a distal end of the surfboard. ### Claim 16 (depends on 10) The system of claim 10, wherein the strut comprises a teardrop shape. ### Claim 17 (depends on 10) The system of claim 10, wherein the back wing further comprises a back hinge. ### Claim 18 (depends on 17) The system of claim 17, wherein the back hinge is manually adjustable to control an angle of the back wing to the fuselage. ### Claim 19 (depends on 17) The system of claim 17, wherein the back hinge allows the back wing to fluctuate within a predefined angle range of the back wing to the fuselage depending on one or both a position or motion of the hydrofoil device within water. ### Claim 20 (depends on 10) The system of claim 10, wherein the front hinge further comprises a reinforcement region that stabilizes and strengthens the connection between the front wing and the fuselage.