IP Library Granted Patent US 11,649,026
Granted Patent B2
US 11,649,026 · App. 17/577,587 · Granted May 16, 2023

Propeller

Inventor: Gregory Charles Sharrow (Grosse Pointe Park, MI)
Assignee: Sharrow Engineering LLC
B63H1/265B64C11/00B64C11/005B64C11/16B64C11/18B64C11/20F01D5/141F02K3/06F03D1/0625F04D29/384F04D17/025F05B2210/16F05B2250/24F05B2250/25F05B2250/26Y02E10/72Y02T50/60Y10T29/49332
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Quick Facts
Patent No.
US 11,649,026
App. No.
17/577,587
Granted
May 16, 2023
Kind
B2
Abstract

A propeller having a plurality of blades extending radially outward from a hub, the blades forming a loop. Each loop having an intake portion, an exhaust portion and a tip portion extending radially outward from the hub and a gap between the intake root and the exhaust root. The tip portion of each of the blades is 30%-75% of the blade, the tip portion beginning at a first deviation from zero of the roll value and extending to 90 degrees, wherein roll value is zero in a plane parallel to the hub axis, and wherein the blades have a vertical angle between −45 degrees and 45 degrees throughout.

Claims (23)

1. A propeller for use with fluids, the propeller provided to propel an object or person or to move the fluid, the propeller comprising:

a plurality of blades;

a rotational axis coincident with a hub;

each blade of the plurality of blades extending radially outward from the rotational axis and disposed around the rotational axis;

each blade forming a loop and having an intake portion, an exhaust portion and a tip portion extending radially outward from the rotational axis;

the loop of each blade having an intake root and an exhaust root, and a gap between the intake root and the exhaust root;

the propeller having a configuration to generate non-axial lift and non-axial fluid flow that includes:

the tip portion of each blade of the plurality of blades is

30%-75% of the blade; and

the tip portion beginning at a first deviation from zero of the roll value and extending to 90 degrees, wherein the roll value is zero in a plane parallel to the rotational axis; and

the propeller having a configuration to redirect the non-axial fluid flow to axial fluid flow that includes:

a vertical angle between −45 degrees and 45 degrees throughout.

2. The propeller of claim 1 wherein rake of each blade of the plurality of blades is increasingly negative from the intake root through the first 30 percent to 40 percent of each blade of the plurality of blades, then increases for the next 10 percent to 15 percent of each blade of the plurality of blades until it reaches positive values and continues to increase for an additional 20 percent to 40 percent of each blade of the plurality of blades and then levels off for the remainder of each blade of the plurality of blades or decreases.

3. The propeller of claim 1 wherein the average pitch angle of the exhaust portion of each blade of the plurality of blades is greater than the average pitch of the intake portion.

4. The propeller of claim 1 wherein each blade of the plurality of blades has the intake root and the exhaust root, and wherein the value of rake at the intake root position of each blade of the plurality of blades is less than the value of rake at the exhaust root position resulting in a gap between the intake root and the exhaust root.

5. The propeller of claim 1 wherein a transition from the intake portion to the tip portion occurs when the amount of non-axial lift produced by a given parameter section of each blade of the plurality of blades is greater than the axial lift produced.

6. The propeller of claim 1 wherein each blade of the plurality of blades has the intake root and the exhaust root, and wherein rake values of each blade of the plurality of blades decrease from the intake root and in the intake portion of each blade of the plurality of blades and increase in the exhaust portion of each blade of the plurality of blades.

7. A method of manufacturing a propeller having a plurality of blades, each blade of the plurality of blades having an intake portion, an exhaust portion, and a tip portion extending from the intake portion to the exhaust portion, the method comprising:

defining a plurality of parameter sections by selecting parameters including skew angle, roll angle, rake, radius, pitch angle, vertical angle values, wherein the selected values redirect lift;

defining a parameter section at the transition from the intake portion to the tip portion by parameters to cause the amount of non-axial lift in the tip portion to be greater than the axial lift in the tip portion;

defining parameter sections to include a roll value of 90 degrees in the tip portion; and

extrapolating between parameter sections to form smooth lines to form a blade configured to form a loop when attached to a hub by;

attaching the plurality of blades to the hub to form the propeller.

Assignments (4)
SECURITY INTEREST Recorded Oct 15, 2025
From: SHARROW ENGINEERING INC.
To: BLADES AND WAVES, LLC
Reel/Frame 072575/0470 →
ENTITY CONVERSION Recorded Oct 15, 2025
From: SHARROW ENGINEERING, LLC
To: SHARROW ENGINEERING INC.
Reel/Frame 073078/0744 →
SECURITY INTEREST Recorded Mar 10, 2025
From: SHARROW ENGINEERING, LLC
To: BLADES AND WAVES, LLC
Reel/Frame 070455/0825 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Apr 7, 2022
From: SHARROW, GREGORY CHARLES
To: SHARROW ENGINEERING LLC
Reel/Frame 059630/0687 →
Continuity (7)
Continuation 15897767 · Feb 15, 2018
Continuation 15605764 · May 25, 2017
Continuation In Part 13843344 · Mar 15, 2013
Provisional Application 61735140 · Dec 10, 2012
Provisional Application 62342284 · May 27, 2016
Provisional Application 62508139 · May 18, 2017
Related Publication 20220135195A1 · May 5, 2022
Cited By (1)
US 12,448,098