Shallow water propellers
OwnerAaron Stampickinventor
Life of this patent
Estimating the term…
Abstract
A device includes a hub and a blade. The hub has a cylindrical geometry. The blade extends radially from the hub. The blade has a helical structure. The blade includes a leading edge, a winglet, a trailing edge, and a trough. The leading edge is formed on the blade and has an arcuate geometry. The winglet of the blade is distal relative to the hub. The winglet angles away from a surface of the blade. The trailing edge is formed on the blade to be opposite the leading edge. At least a portion of the trailing edge forms a pitch-line cup that is angled with respect to the surface of the blade. The trough is formed in a transition between the pitch-line cup of the trailing edge and the winglet. The trough forms a recess that is relatively closer to the surface of the blade.
Claims20
A device, comprising:
- a hub having a generally cylindrical geometry;
- and
- a first blade and a second blade coupled to the hub, wherein each blade is configured to extend radially outward from the hub, each blade having a helical structure relative to the hub, each blade comprising:
- a surface area that lies between a leading edge formed at a periphery of the blade and a trailing edge formed on the blade opposite the leading edge, the surface area having a rake angle relative to the hub;
- the leading edge having an arcuate geometry;
- at least a portion of the trailing edge having a pitch-line cup which has a geometry that is angled with respect to the surface of the blade;
- a winglet formed on the blade distal to the hub at an outer edge of the blade, the winglet is a raised portion of the blade that curves axially from the surface of the blade to have a rake angle greater than the rake angle of the surface of the blade adjacent to the winglet;
- wherein the leading edge terminates at an intersection with the trailing edge of the blade at a tip of the winglet;
- a trough formed in a transition between the pitch-line cup of the trailing edge and the winglet, the trough forming a recess between the pitch-line cup and the winglet;
- and
- an inside edge that connects the trailing edge of the blade to a trailing end of the hub, wherein a radiused corner is formed at an intersection of the inside edge and the trailing edge.
A device, comprising:
- a hub having a generally cylindrical geometry;
- and
- a first blade and a second blade coupled to the hub, wherein each blade is configured to extend radially outward from the hub, each blade having a helical structure relative to the hub, each blade comprising:
- a surface area that lies between a leading edge formed at a periphery of the blade and a trailing edge formed on the blade opposite the leading edge;
- the leading edge having an arcuate geometry;
- a winglet formed on the blade distal to the hub at an outer edge of the blade, the winglet is a raised portion of the blade that curves axially from the surface of the blade;
- a trough formed in a transition between the trailing edge and the winglet, the trough forming a recess between the trailing edge and the winglet;
- and
- an inside edge that connects the trailing edge of the blade to a trailing end of the hub, wherein a radiused corner is formed at an intersection of the inside edge and the trailing edge, and wherein the trailing edge comprises an adjustable corner radius formed as the trailing edge transitions to the hub.
A device, comprising:
- a hub having a generally cylindrical geometry;
- and
- a first blade and a second blade coupled to the hub, wherein each blade is configured to extend radially outward from the hub, each blade having a helical structure relative to the hub, each blade comprising:
- a leading edge formed at a periphery of the blade and a trailing edge formed on the blade opposite the leading edge;
- the leading edge having an arcuate geometry;
- a winglet formed on the blade distal to the hub at an outer edge of the blade, the winglet is a raised portion of the blade that curves axially from the blade;
- a trough formed in a transition between the trailing edge and the winglet, the trough forming a recess between the trailing edge and the winglet;
- and
- an inside edge that connects the trailing edge of the blade to a trailing end of the hub, wherein a radiused corner is formed at an intersection of the inside edge and the trailing edge, and wherein the trailing edge comprises an adjustable corner radius formed as the trailing edge transitions to the hub.
Dependencies are inferred from the claim text.