# US 11,148,784 B2 · Propeller system with directional thrust control > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,148,784 B2 - Document ID: US11148784B2 - Status: Granted - Kind: B2 - Application number: 16/402,691 - Filed: 2019-05-03 - Published: 2019-08-29 - Granted: 2021-10-19 - Earliest claimed: 2017-03-31 - Assignees: Alluvionic, Inc. - Applicants: Alluvionic, Inc. - Inventors: Ricardo Romeu; William Eric Holland - Web page: https://patentgrep.com/patent/US11148784B2 ## CPC - B64C 11/44: electric - B64C 39/024: {of the remote controlled vehicle type, i.e. RPV} - B64C 11/00: Propellers, e.g. of ducted type; Features common to propellers and rotors for rotorcraft - B64C 11/001: {Shrouded propellers} - B64C 11/06: for variable-pitch blades - B64C 11/20: Constructional features - B64C 11/28: Collapsible or foldable blades - B64C 11/32: mechanical - B64C: AEROPLANES; HELICOPTERS ## Abstract A propeller system including a propeller including a central attachment member and a plurality of blade apparatuses, each including a blade body attached to the central attachment member and a magnetic coupling member attached to a radially outward end of the blade body. The propeller system further comprises a propeller frame configured to at least partially circumscribe the magnetic coupling member of each blade apparatus and a plurality of electromagnets positioned on the propeller frame and operable to generate magnetic fields to suspend the magnetic coupling members, laterally translate the magnetic coupling members, rotate the magnetic coupling members along the radial axis of the propeller system, thereby rotating the blade bodies. ## Claims ### Claim 1 A propeller system comprising: a propeller comprising: a central attachment member positioned at a rotational axis of the propeller; and a plurality of blade apparatuses, each blade apparatus of the plurality of blade apparatuses comprising: a blade body attached to the central attachment member such that each blade apparatus of the plurality of blade apparatuses may rotate about a radial axis of the propeller system independent of both the central attachment member and each other blade apparatus of the plurality of blade apparatuses; and a magnetic coupling member attached to a radially outward end of the blade body such that rotation of the magnetic coupling member along the radial axis of the propeller system may similarly rotate the blade body and lateral movement of the magnetic coupling member causes the blade body to rotate about the rotational axis of the propeller; a propeller frame configured to at least partially circumscribe the magnetic coupling member of each blade apparatus and defining an aperture within which each of the central attachment member and the plurality of blade apparatuses are positioned; and a plurality of electromagnets positioned on the propeller frame and operable to generate magnetic fields to suspend the magnetic coupling members, laterally translate the magnetic coupling members, and rotate the magnetic coupling members along the radial axis of the propeller system. ### Claim 2 (depends on 1) The propeller system of claim 1 wherein a ratio of a maximum blade width between a leading edge of the blade body and a trailing edge of the blade body to a blade length of the blade body is within a range from 0.4 to 0.65. ### Claim 3 (depends on 2) The propeller system of claim 2 wherein the ratio between the maximum blade width to the blade length is within a range from 0.54 to 0.56. ### Claim 4 (depends on 1) The propeller system of claim 1 wherein a ratio of a maximum blade thickness and a maximum blade width between a leading edge of the blade body and a trailing edge of the blade body is within a range from 0.15 to 0.22. ### Claim 5 (depends on 4) The propeller system of claim 4 wherein the ratio of the maximum blade thickness and the maximum blade width is within a range from 0.18 to 0.19. ### Claim 6 (depends on 1) The propeller system of claim 1 wherein the plurality of electromagnets comprises: a first subset of electromagnets positioned to define a first annulus that defines a plane that is offset from a rotational plane defined by the plurality of blade apparatuses in a first direction; and a second subset of electromagnets positioned to define a second annulus that defines a plane that is offset from the rotational plane defined by the plurality of blade apparatuses in a second direction that is opposite the first direction. ### Claim 7 (depends on 1) The propeller system of claim 1 further comprising a mounting frame rotationally coupled to the propeller frame. ### Claim 8 (depends on 1) The propeller system of claim 1 further comprising: an inlet cowling attached to and extending proximally from the propeller frame; and an outlet cowling attached to and extending distally from the propeller frame. ### Claim 9 (depends on 1) The propeller system of claim 1 wherein the propeller frame has an outer diameter equal to or less than 36 inches. ### Claim 10 (depends on 9) The propeller system of claim 9 further comprising an inner wall positioned intermediate the plurality of electromagnets and the blade body of the plurality of blade apparatuses such that an airfoil gap is defined between the radially outward end of the blade body of each blade apparatus of the plurality of blade apparatuses and the inner wall. ### Claim 11 (depends on 1) The propeller system of claim 1 wherein the central attachment member is formed of a material having a density of less than five grams per cubic centimeter. ### Claim 12 (depends on 1) The propeller system of claim 1 further comprising: a power source coupled to the plurality of electromagnets and configured to provide power to the plurality of electromagnets for generation of magnetic fields thereby; and a controller coupled to the power source and configured to control operation of the plurality of electromagnets; wherein the magnetic coupling members are configured to be oriented in one of a plurality of rotational orientations; and wherein the controller is configured to operate the plurality of electromagnets to generate magnetic fields operable to rotate the magnetic coupling members between rotational orientations. ### Claim 13 (depends on 12) The propeller system of claim 12 wherein the controller is configured to operate the plurality of electromagnets to generate magnetic fields to rotate the magnetic coupling members between rotational orientations as the propeller rotates such that an effective rotational orientation of magnetic coupling members over the course of at least a partial rotation of the propeller is between two rotational orientations. ### Claim 14 (depends on 1) The propeller system of claim 1 wherein the magnetic coupling member comprises: a body member comprising a circular perimeter; a plurality of recesses formed in an exterior surface about the perimeter of the body member; and a plurality of permanent magnets, each permanent magnet being positioned and retained within a recess of the plurality of recesses. ### Claim 15 A propeller system comprising: a propeller comprising: a central attachment member positioned at a rotational axis of the propeller; and a plurality of blade apparatuses, each blade apparatus of the plurality of blade apparatuses comprising: a blade body attached to the central attachment member such that each blade apparatus may rotate about a radial axis of the propeller system independent of both the central attachment member and each other blade apparatus of the plurality of blade apparatuses; and a magnetic coupling member attached to a radially outward end of the blade body such that rotation of the magnetic coupling member along the radial axis of the propeller system may similarly rotate the blade body and lateral movement of the magnetic coupling member causes the blade body to rotate about the rotational axis of the propeller; a propeller frame configured to at least partially circumscribe the magnetic coupling member of each blade apparatus of the plurality of blade apparatuses and defining an aperture within which each of the central attachment member and the plurality of blade apparatuses are positioned; an inner wall positioned intermediate the plurality of electromagnets and the blade body of the plurality of blade apparatuses such that an airfoil gap is defined between the radially outward end of the blade body of each blade apparatus and the inner wall; an inlet cowling attached to and extending proximally from the propeller frame; an outlet cowling attached to and extending distally from the propeller frame; a plurality of electromagnets positioned on the propeller frame and operable to generate magnetic fields to suspend the magnetic coupling members, laterally translate the magnetic coupling members, rotate the magnetic coupling members along the radial axis of the propeller system; a power source coupled to the plurality of electromagnets and configured to provide power to the plurality of electromagnets for generation of magnetic fields thereby; and a controller coupled to the power source and configured to control operation of the plurality of electromagnets. ### Claim 16 (depends on 15) The propeller system of claim 15 wherein the plurality of electromagnets comprises: a first subset of electromagnets positioned to define a first annulus that defines a plane that is offset from a rotational plane defined by the plurality of blade apparatuses in a first direction; and a second subset of electromagnets positioned to define a second annulus that defines a plane that is offset from the rotational plane defined by the plurality of blade apparatuses in a second direction that is opposite the first direction. ### Claim 17 (depends on 16) The propeller system of claim 16 wherein: the magnetic coupling members are configured to be oriented in one of a plurality of rotational orientations; the controller is configured to operate the plurality of electromagnets to generate magnetic fields operable to rotate the magnetic coupling members between rotational orientations; and the controller is further configured to operate the plurality of electromagnets to generate magnetic fields to rotate the magnetic coupling members between rotational orientations as the propeller rotates such that an effective rotational orientation of magnetic coupling members over the course of at least a partial rotation of the propeller is between two rotational orientations. ### Claim 18 (depends on 16) The propeller system of claim 16 wherein the magnetic coupling member comprises: a body member comprising a circular perimeter; a plurality of recesses formed in an exterior surface about the perimeter of the body member; and a plurality of permanent magnets, each permanent magnet being positioned and retained within a recess of the plurality of recesses. ### Claim 19 A propeller system comprising: a propeller comprising: a central attachment member positioned at a rotational axis of the propeller; and a plurality of blade apparatuses, each blade apparatus of the plurality of blade apparatuses comprising: a blade body attached to the central attachment member such that each blade apparatus may rotate about a radial axis of the propeller system independent of both the central attachment member and each other blade apparatus of the plurality of blade apparatuses; and a magnetic coupling member attached to a radially outward end of the blade body such that rotation of the magnetic coupling member along the radial axis of the propeller system may similarly rotate the blade body and lateral movement of the magnetic coupling member causes the blade body to rotate about the rotational axis of the propeller; a propeller frame configured to at least partially circumscribe the magnetic coupling member of each blade apparatus of the plurality of blade apparatuses and defining an aperture within which each of the central attachment member and the plurality of blade apparatuses are positioned, the propeller frame having an outer diameter equal to or less than 36 inches; an inner wall positioned intermediate the plurality of electromagnets and the blade body the plurality of blade apparatuses such that an airfoil gap is defined between the radially outward end of the blade body of each blade apparatus of the plurality of blade apparatuses and the inner wall; an inlet cowling attached to and extending proximally from the propeller frame; an outlet cowling attached to and extending distally from the propeller frame; a plurality of electromagnets positioned on the propeller frame and operable to generate magnetic fields to suspend the magnetic coupling members, laterally translate the magnetic coupling members, and rotate the magnetic coupling members along the radial axis of the propeller system; a power source coupled to the plurality of electromagnets and configured to provide power to the plurality of electromagnets for generation of magnetic fields thereby; and a controller coupled to the power source and configured to control operation of the plurality of electromagnets; wherein a ratio of a maximum blade width between a leading edge of the blade body and a trailing edge of the blade body to a blade length of the blade body is within a range from 0.4 to 0.65; and wherein a ratio of a maximum blade thickness and a maximum blade width between a leading edge of the blade body and a trailing edge of the blade body is within a range from 0.15 to 0.22.