# US 10,442,525 B2 · Rotor or propeller blade with dynamically variable geometry and other properties

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- Number: US 10,442,525 B2
- Document ID: US10442525B2
- Status: Granted
- Kind: B2
- Application number: 15/149,099
- Filed: 2016-05-07
- Published: 2017-11-09
- Granted: 2019-10-15
- Earliest claimed: 2016-05-07
- Assignees: Optivector Ltd
- Applicants: Philip Bogrash
- Inventors: Philip Bogrash
- Web page: https://patentgrep.com/patent/US10442525B2

## CPC

- B64C 11/18: Aerodynamic features
- B63H 1/04: with rotation axis substantially at right angles to propulsive direction
- B63H 1/08: with cyclic adjustment
- B64C 11/20: Constructional features
- F03D 1/0675: {of the blades}
- F05B 2240/31: of changeable form or shape
- Y02E 10/72: Wind turbines with rotation axis in wind direction
- B64C: AEROPLANES; HELICOPTERS
- B63H: MARINE PROPULSION OR STEERING (propulsion of air-cushion vehicles B60V1/14; specially adapted for submarines, other than nuclear propulsion, B63G; specially adapted for torpedoes F42B19/00)
- F03D: WIND MOTORS
- F05B: INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A blade for the cycloidal marine propellers or cycloidal aerial rotors operative, in response to control system commands, to dynamically; flex along its chord, vary its relative pivot point position, change its planform by extending or retracting a trailing edge extension, differentially, turn the flap along the trailing edge in either direction or allow it to be turned by the flows. For the reversal of the leading and trailing edges for operation in reverse airflow and other conditions the blades are provided with edges that can be made rigid when functioning as the leading edge and flexible if needed when functioning as the trailing edge. Also, the blades are configured to vary and reshape their cross-sectional profile thickness. Finally, the blades are given on command flow permeability along much of their surface.

## Claims

### Claim 1

A method for altering fluid dynamic properties of a cycloidal blade, the method comprising:
providing a cycloidal blade having:
a collective blade surface formed from a series of separately orientable, flow surfaces,
a plurality of independently operable actuators in communication with the flow surfaces, the actuators operative to orient one or more of the flow surfaces in accordance with commands received from a controlsystem; and
actuating one or more of the actuators within a revolution of the blade.

### Claim 2 (depends on 1)

The method of claim 1, wherein the flow surfaces are implemented as articulated, blade segments.

### Claim 3 (depends on 2)

The method of claim 2 wherein the articulated, blade segments are implemented as foil blade segments.

### Claim 4 (depends on 3)

The method of claim 3 wherein the independently operable actuators are selected from the group consisting of electro-magnetic actuators, electro-active polymer actuators, piezo electric actuators, and smart memory alloy-based actuators.

### Claim 5 (depends on 1)

The method of claim 1, further comprising a flexible core supporting the series of separately orientable, flow surfaces.

### Claim 6 (depends on 5)

The method of claim 5, wherein the flow surfaces are implemented as plates.

### Claim 7 (depends on 6)

The method of claim 6, wherein the plates are implemented as foil parts.

### Claim 8 (depends on 7)

The method of claim 7, wherein the independently operable actuators are implemented as electro-active polymer segments.