# US 11,897,583 B2 · Watercraft device with hydrofoil and electric propulsion system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,897,583 B2 - Document ID: US11897583B2 - Status: Granted - Kind: B2 - Application number: 17/238,085 - Filed: 2021-04-22 - Published: 2021-11-11 - Granted: 2024-02-13 - Earliest claimed: 2020-04-22 - Assignees: Kai Concepts, LLC - Applicants: Kai Concepts, LLC - Inventors: Donald Lewis Montague; Joseph Andrew Brock; Tomasz Pawel Bartczak; Matthew Campbell Greaves; Alec Korver; Dmitri Stepanov - Web page: https://patentgrep.com/patent/US11897583B2 ## CPC - B63B 1/242: {Mounting, suspension of the foils (B63B1/30 takes precedence)} - B63B 1/28: with movable hydrofoils - B63B 32/40: Twintip boards; Wakeboards; Surfboards; Windsurfing boards; Paddle boards, e.g. SUP boards; Accessories specially adapted therefor - B63B 32/66: Arrangements for fixation to the board, e.g. fin boxes or foil boxes - G08C 17/02: using a radio link - B63B 1/246: {Arrangements of propulsion elements} - B63B 32/10: Motor-propelled water sports boards (power-driven personal watercraft B63B34/10) - B63B 2035/008: {remotely controlled} - G08C 2201/10: Power supply of remote control devices - G08C 2201/32: Remote control based on movements, attitude of remote control device - 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) - G08C: TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS (fluid pressure transmitting systems F15B; mechanical means for transferring the output of a sensing member into a different variable G01D5/00; mechanical control systems G05G) ## Abstract A watercraft including a board having a top surface and a bottom surface and a hydrofoil attached to a strut. The strut attaches at the bottom surface of the board. The watercraft includes a movable portion coupled to the top surface of the board such that the movable portion is configured to move relative to a fixed portion of the board. ## Claims ### Claim 1 A watercraft comprising: a board extending longitudinally and having a top surface and a bottom surface; a hydrofoil having a strut attached at the bottom surface of the board; a propulsion system coupled to the strut and operable to drive the watercraft through a body of water; and a movable portion configured to move relative to a fixed portion of the board to facilitate shifting of weight relative to the fixed portion of the board as the propulsion system is operated, the movable portion movable longitudinally along the board from a rear portion of the board to a front portion of the board. ### Claim 2 (depends on 1) The watercraft of claim 1 wherein the movable portion is a plate configured to slide longitudinally relative to the board. ### Claim 3 (depends on 1) The watercraft of claim 1 wherein the movable portion is a seat configured to support a rider, the seat movable longitudinally relative to the board. ### Claim 4 (depends on 1) The watercraft of claim 1 wherein the movable portion is configured to support a portion of a rider having a weight and facilitate the rider shifting the weight relative to the fixed portion of the board. ### Claim 5 (depends on 4) The watercraft of claim 4 wherein the movable portion facilitates weight shift control of the watercraft by the rider as the propulsion system is operated. ### Claim 6 (depends on 4) The watercraft of claim 4 wherein the movable portion is configured to receive the portion of the rider when the rider is in at least one of a seated or prone position on the board. ### Claim 7 (depends on 1) The watercraft of claim 1 wherein the movable portion includes rollers configured to engage the fixed portion of the board. ### Claim 8 (depends on 7) The watercraft of claim 7 wherein the fixed portion of the board includes a channel receiving the rollers to guide the rollers as the movable portion moves relative to the fixed portion of the board. ### Claim 9 (depends on 1) The watercraft of claim 1 wherein the board includes at least one of a track and a rail to guide the movable portion as the movable portion moves relative to the fixed portion of the board. ### Claim 10 (depends on 1) The watercraft of claim 1 further comprising a foot block coupled to the board and having a foot engagement surface. ### Claim 11 (depends on 1) The watercraft of claim 1 further comprising a handle coupled to the board. ### Claim 12 (depends on 1) The watercraft of claim 1 further comprising a platform coupled to the board and supporting the movable portion above the top surface of the board. ### Claim 13 A watercraft comprising: a support platform extending longitudinally and configured to support a rider; a hydrofoil having a strut attached at a bottom surface of the support platform; a propulsion system coupled to the strut and operable to drive the watercraft through a body of water; the support platform having a seat portion and a foot block, the foot block at a longitudinal end portion of the support platform and having a foot engagement surface. ### Claim 14 (depends on 13) The watercraft of claim 13 wherein the foot engagement surface of the foot block extends at an oblique angle relative to a top surface of the support platform.