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US 2021/0197939 A1Published application
Propeller
AssigneeConic Propulsion, LLC
InventorThomas A. Russell
Life of this patent
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Abstract
A propeller. The blades of the propeller are characterized by a blade center axis which corresponds to a generator line of a cone to which the blade, or blade thrust surface, conforms. The propeller hub is fixed to the blade at the root, in line with the blade center axis, such that the hub axis and blade center axis lie in the same plane, and the leading edge of the blade is positioned forward (referring to the upstream direction of movement caused by the propeller) of the trailing edge of the blade.
Claims24
A propeller comprising:
- a hub operable to rotate about an axis of rotation in a direction of rotation, characterized by a forward end and an aft end;
- and
- one or more blades characterized by a root, a tip, a leading edge and a corresponding trailing edge, and a thrust surface;
- wherein
- the thrust surface of each blade conforms to a surface of a reference cone characterized by a vertex, a base, a vertical axis, and a reference cone circumference, said circumference defined by an intersection of a plane perpendicular to the vertical axis and passing through the reference cone surface and a plurality of generator lines;
- wherein
- a blade center axis extending radially from the root of each blade is coincident with a generator line of the cone, and the root of each blade is fixed to the hub such that the axis of rotation is coplanar with the blade center axis of each blade;
- wherein
- the gamma angle, being the angle between the radial axis and a vector in the direction of rotation, is 90°, where said vector is perpendicular to an imaginary line formed on the blade face by the intersection of a plane perpendicular to the axis of rotation, and said vector lies in said plane perpendicular to the axis of rotation;
- wherein
- at the leading edge of each of the one or more blades, the gamma angle formed at any given radius from the axis of rotation is greater than 90°;
- and
- at the trailing edge of each of the one or more blades, the gamma angle formed at any given radius from the axis of rotation is less than 90°.
10 more elements
A propeller comprising:
- a blade having a thrust face which substantially conforms to area of the curved surface of a cone;
- said blade being disposed with respect to the propeller axis so that a plane containing the propeller axis will also contain a generator line of the cone which corresponds to a long axis of the blade.
A propeller comprising:
- a hub operable to rotate about an axis of rotation in a direction of rotation, characterized by a forward end and an aft end;
- and
- one or more blades characterized by a root, a tip, a leading edge and a corresponding trailing edge, and a thrust surface,
- wherein the thrust surface of each blade conforms to the surface of a reference cone characterized by a vertex, a base, and generator lines,
- wherein an angle whose vertex lies on a plane perpendicular to the axis of rotation at a point where it intersects the thrust surface, and on an imaginary cylinder concentric with the axis of rotation, having one side of the angle in the plane of rotation and perpendicular to the radius, and the other side tangent to the imaginary cylinder at the point of intersection with the thrust surface, is 90° or less apart from any other such angle at the same radius on the thrust surface.
2 more elements
A propeller comprising:
- a hub operable to rotate about an axis of rotation in a direction of rotation, characterized by a forward end and an aft end;
- and
- one or more blades characterized by a root, a tip, a leading edge and a corresponding trailing edge, and a thrust surface, wherein
- each of the one or more blades is characterized by gamma angles that transition from obtuse to acute from the leading edge to the trailing edge.
1 more element
Dependencies are inferred from the claim text.