US 12,030,605 B1
Shallow water propellers
Aaron Stampick, Ogden, UT (US)
Filed by Roost Marine LLC, Ogden, UT (US)
Filed on Jul. 3, 2023, as Appl. No. 18/346,478.
Claims priority of provisional application 63/368,040, filed on Jul. 8, 2022.
Int. Cl. B63H 1/26 (2006.01); B63H 1/18 (2006.01); B63H 1/20 (2006.01); B63H 1/28 (2006.01); B63H 3/00 (2006.01)
CPC B63H 1/26 (2013.01) [B63H 1/20 (2013.01); B63H 1/28 (2013.01); B63H 3/002 (2013.01); B63H 2001/185 (2013.01)] 20 Claims
OG exemplary drawing
 
1. 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.