Patents-Review.com
ClassID:

72115 ⎘

B64C27/32 - CPC Classification

Classification description:

Rotorcraft; Rotors peculiar thereto Rotors

Sub-classes:
Recent Application in this class:
#1
20260042534
2026-02-12

Autonomous Aerial Vehicle Hardware Configuration

 #2
20260008542
2026-01-08

FLYING VEHICLE ROTOR ARRANGEMENT

 #3
20250368324
2025-12-04

FLIGHT COMPONENT SIGNAL AUTHENTICATION

 #4
20250361006
2025-11-27

Aircraft with Pusher Propeller

 #5
20250319977
2025-10-16

Multi-Rotor Airspeed Calculation Method, Airspeed Envelope Protection Method, Device, and Computer-Readable Storage Medium

 #6
20250233477
2025-07-17

ELECTRIC DRIVE DEVICE

 #7
20250229895
2025-07-17

HOLLOW MULTI-BLADE ROTOR, ASSEMBLY, AND METHOD OF MANUFACTURE

 #8
20250196999
2025-06-19

Autonomous Aerial Vehicle Rotor Configurations

 #9
20250187726
2025-06-12

Autonomous Aerial Vehicle Hardware Configuration

 #10
20250144455
2025-05-08

AIRCRAFT MAINTENANCE FALL PROTECTION

 #11
20250093878
2025-03-20

MULTICOPTER WITH SELF-ADJUSTING ROTORS

 #12
20250058871
2025-02-20

Autonomous Aerial Vehicle Hardware Configuration

 #13
20250033282
2025-01-30

METAL PLATED ADDITIVELY MANUFACTURED PLASTIC ACM SHROUDS WITH INTERNAL THERMALLY ADAPTIVE STRUCTURE

 #14
20250002144
2025-01-02

Autonomous Aerial Vehicle Hardware Configuration

 #15
20240391585
2024-11-28

Aerial vehicle

 #16
20240317393
2024-09-26

ROTOR ASSEMBLY AND UNMANNED AERIAL VEHICLE HAVING THE SAME

 #17
20240300663
2024-09-12

THRUST GENERATOR FOR ROTORCRAFT

 #18
20240300642
2024-09-12

THRUST GENERATOR FOR ROTORCRAFT

 #19
20240300637
2024-09-12

FLIGHT VEHICLE

 #20
20240262517
2024-08-08

Aircraft Electric Motor Cooling System

 #21
20240246668
2024-07-25

ELECTRIC FAN AND ELECTRIC VERTICAL TAKEOFF/LANDING AIRCRAFT

 #22
20240229808
2024-07-11

DEVICE AND METHOD FOR CONVERTING RECIPROCATING MOTION INTO CONTINUOUS ROTATION, AND APPLICATION

 #23
20240140599
2024-05-02

Blade provided with a root comprising an integrated pitch attachment and two integrated damper attachments, and a rotor provided with such a blade

 #24
20240133389
2024-04-25

DEVICE AND METHOD FOR CONVERTING RECIPROCATING MOTION INTO CONTINUOUS ROTATION, AND APPLICATION

 #25
20240128819
2024-04-18

ROTOR FOR AN ELECTRIC AIRCRAFT MOTOR AND A METHOD FOR MANUFACTURING

 #26
20240109651
2024-04-04

AERIAL VEHICLES, COOPERATIVE FLYING SYSTEMS, AND METHODS OF OPERATING THE SAME

 #27
20240076039
2024-03-07

PACKAGE TRANSPORT DEVICE AND CONTROL METHOD

 #28
20240076031
2024-03-07

Rotor support device

 #29
20240045446
2024-02-08

Multicopter with self-adjusting rotors

 #30
20240025540
2024-01-25

VERTICAL TAKE-OFF AND LANDING AERODYNE OPTIMISED FOR HORIZONTAL FLIGHT

 #31
20240010358
2024-01-11

RAPID RE-DIRECTIONAL TWO-WAY CONCURRENT TILT LIFT MODULE SYSTEM

 #32
20240010334
2024-01-11

Personal Aircraft Including a Rotor

 #33
20240002044
2024-01-04

FLIGHT UNIT FOR AN AIRCRAFT

 #34
20230391448
2023-12-07

Aerodynamic rotary interface

 #35
20230383700
2023-11-30

Selective power distribution for an aircraft propulsion system

 #36
20230305580
2023-09-28

CONTROL DEVICE

 #37
20230294825
2023-09-21

Electric vertical take off and landing vehicle

 #38
20230286650
2023-09-14

FLYING VEHICLE ROTOR ARRANGEMENT

 #39
20230279847
2023-09-07

Hub Feed Oil System

 #40
20230271699
2023-08-31

Aerial vehicle

 #41
20230234729
2023-07-27

UNMANNED AERIAL VEHICLE

 #42
20230234701
2023-07-27

ROTOR FOR AN AIRCRAFT CAPABLE OF HOVERING

 #43
20230192280
2023-06-22

Rotor assembly connectable to rotor hub and having pitch control

 #44
20230182916
2023-06-15

System defining a hybrid power unit for thrust generation in an aerial vehicle and method for controlling the same

 #45
20230182896
2023-06-15

Bearing restraint for use on a rotor mast

 #46
20230166862
2023-06-01

Autonomous Aerial Vehicle Hardware Configuration

 #47
20230159159
2023-05-25

SYSTEMS AND METHODS FOR IMPROVED ROTOR ASSEMBLY FOR USE WITH A STATOR

 #48
20230150651
2023-05-18

CONTROLLED FLIGHT OF A MULTICOPTER EXPERIENCING A FAILURE AFFECTING AN EFFECTOR

 #49
20230144408
2023-05-11

Autonomous aerial vehicle hardware configuration

 #50
20230037680
2023-02-09

Aerial vehicle

 #51
20230036129
2023-02-02

Aerial vehicle with hybrid drive and rotor unit including rotor shafts coupled by inclined synchro gear wheels

 #52
20230026233
2023-01-26

System for controlling propeller and rotor RPM of aerial vehicle having multiple power devices

 #53
20230020198
2023-01-19

Air mobility vehicle

 #54
20230019240
2023-01-19

ROTOR MOUNT ASSEMBLY

 #55
20230016832
2023-01-19

COMPOSITE YOKE FOR ROTOR SYSTEM USING A COMBINATION OF BROAD GOODS AND CHOPPED FIBER LAYUP

 #56
20230002074
2023-01-05

Autonomous aerial vehicle hardware configuration

 #57
20220411103
2022-12-29

Autonomous Aerial Vehicle Hardware Configuration

 #58
20220411102
2022-12-29

Autonomous aerial vehicle hardware configuration

 #59
20220402600
2022-12-22

Real time rotor head moment measurement, control, and limiting

 #60
20220380025
2022-12-01

Download reducing winglets for aircraft having a rotor producing downwash and method of operating the same

 #61
20220355952
2022-11-10

Autonomous aerial vehicle hardware configuration

 #62
20220348339
2022-11-03

Aircraft with folding mechanism

 #63
20220324580
2022-10-13

Hybrid multirotor propulsion system for an aircraft with power management unit to cause total mechanical power to split and aggregate to drive propeller

 #64
20220297826
2022-09-22

Methods and apparatus to recover rotorcraft

 #65
20220285753
2022-09-08

AIRCRAFT BATTERY PACK AND ASSOCIATED COOLING SYSTEM

 #66
20220258873
2022-08-18

Redundant electric propulsion system

 #67
20220234729
2022-07-28

Flight propulsion system based on rotary and stationary devices

 #68
20220234470
2022-07-28

Systems and methods for power distribution in electric aircraft

 #69
20220227489
2022-07-21

Systems and methods for yaw-torque reduction on a multi-rotor aircraft

 #70
20220219816
2022-07-14

COMPACT INTEGRATED MAST AND CARRIER

 #71
20220194621
2022-06-23

Aircraft propulsion system

 #72
20220194616
2022-06-23

Aircraft propulsion system

 #73
20220194573
2022-06-23

Thrusters for Multi-Copter Yaw Control and Forward Flight

 #74
20220194569
2022-06-23

AERIAL VEHICLES, COOPERATIVE FLYING SYSTEMS, AND METHODS OF OPERATING THE SAME

 #75
20220186792
2022-06-16

Free-wheel provided with variable-opening lubrication barrier

 #76
20220169362
2022-06-02

Aircraft drag reduction system including an internally cooled motor system and aircraft using same

 #77
20220153147
2022-05-19

Secondary battery, battery pack, electronic device, electric tool, electric aircraft, and electric vehicle

 #78
20220126990
2022-04-28

DOUBLE-BLADE TANDEM HELICOPTER

 #79
20220119102
2022-04-21

Aerial vehicle

 #80
20220119100
2022-04-21

Air mobility vehicle

 #81
20220106050
2022-04-07

System defining a hybrid power unit for thrust generation in an aerial vehicle and method for controlling the same

 #82
20220106039
2022-04-07

AERIAL VEHICLE

 #83
20220089278
2022-03-24

BLADE AND ROTOR OF ROTOR CRAFT, AND ROTOR CRAFT

 #84
20220017226
2022-01-20

Method of fabricating rotary equipment for a rotary wing, provided with a deicer, said rotary equipment, and a drone provided with said rotary equipment

 #85
20210404516
2021-12-30

Rotor retention fitting with integral bearing and pitch control

 #86
20210403177
2021-12-30

Autonomous aerial vehicle rotor configurations

 #87
20210403151
2021-12-30

Rotor assembly and unmanned aerial vehicle having the same

 #88
20210389054
2021-12-16

Cooling system for rotor hub mounted component

 #89
20210365048
2021-11-25

Multi-rotor aircraft and method of controlling same

 #90
20210356974
2021-11-18

Multicopter with self-adjusting rotors

 #91
20210316874
2021-10-14

System defining a hybrid power unit for thrust generation in an aerial vehicle and method for controlling the same

 #92
20210309353
2021-10-07

Modular unmanned aerial vehicle system for adaptable parcel delivery

 #93
20210309350
2021-10-07

Rotor Units Having Asymmetric Rotor Blades

 #94
20210309349
2021-10-07

Sensor for monitoring rotors

 #95
20210309346
2021-10-07

SELECTING PROPELLERS FOR PERFORMANCE AND NOISE SHAPING

 #96
20210309059
2021-10-07

Land and aerial transportation vehicle and powertrain thereof

 #97
20210284321
2021-09-16

Driving device, propeller, and propulsion system

 #98
20210276704
2021-09-09

Rotor Units Having Asymmetric Rotor Blades

 #99
20210261240
2021-08-26

Download reducing winglets for aircraft having a rotor producing downwash and method of operating the same

 #100
20210245873
2021-08-12

Aircraft with pusher propeller

 #101
20210237888
2021-08-05

Airframe of a volitant body

 #102
20210197963
2021-07-01

Clevis assembly with bearing device in operable communication with a translating element, and fail-safe tail rotor system including the same

 #103
20210188422
2021-06-24

Controlled flight of a multicopter experiencing a failure affecting an effector

 #104
20210139139
2021-05-13

Bonded skins for ducted-rotor aircraft

 #105
20210107645
2021-04-15

Passive and active stability systems for ballistically launched multirotors

 #106
20210101676
2021-04-08

SPAR FOR DUCTED-ROTOR AIRCRAFT

 #107
20210094684
2021-04-01

Light communication slip ring

 #108
20210094679
2021-04-01

One-Piece Mast, Planetary Plate, and Web Carrier

 #109
20210036580
2021-02-04

Propulsor system with integrated passive cooling

 #110
20200398976
2020-12-24

Mount systems for pylon assemblies with coaxial rotors

 #111
20200377203
2020-12-03

Self-tightening rotor

 #112
20200362722
2020-11-19

Method and system for operating a rotorcraft engine

 #113
20200354054
2020-11-12

Vertical take off and landing flying machine

 #114
20200354046
2020-11-12

Differential Rotor Speed Resonance Avoidance System

 #115
20200343804
2020-10-29

MULTI-STAGE SPHERICAL MOTOR

 #116
20200331598
2020-10-22

Multicopter-assisted system and method for launching and retrieving a fixed-wing aircraft

 #117
20200324887
2020-10-15

Negative hinge offset rotor head for a helicopter

 #118
20200317330
2020-10-08

Rotor head for aerial vehicle

 #119
20200298968
2020-09-24

Rotor for a hover-capable aircraft and method for containment of vibrations transmitted to the mast of a rotor of a hover-capable aircraft

 #120
20200298962
2020-09-24

Method and a device for moving the center of gravity of an aircraft

 #121
20200290117
2020-09-17

Multiple materials and microstructures in cast alloys

 #122
20200283135
2020-09-10

Systems and methods for improved guidance of a rotor relative to a stator

 #123
20200283132
2020-09-10

Systems and methods for reducing noise based on effective rotor area relative to a center of rotation

 #124
20200283126
2020-09-10

Multi-rotor vehicle with edge computing systems

 #125
20200283125
2020-09-10

Multi-rotor vehicle with edge computing systems

 #126
20200278699
2020-09-03

Rotorcraft and method of controlling rotorcraft

 #127
20200277048
2020-09-03

Systems and methods for variable blade pitch control

 #128
20200277047
2020-09-03

Systems and methods for dynamically triggering independent stator coils to control rotational velocity of a rotor

 #129
20200262543
2020-08-20

Controlled flight of a multicopter experiencing a failure affecting an effector

 #130
20200247534
2020-08-06

Low drag hub for rotor

 #131
20200224644
2020-07-16

Inertial force polarizer apparatus

 #132
20200216172
2020-07-09

Rotor units having asymmetric rotor blades

 #133
20200207465
2020-07-02

Variable rotary radially supported mass vibration suppression system

 #134
20200172233
2020-06-04

Systems and methods for controlling lift using contra-rotating rotors

 #135
20200164973
2020-05-28

Propulsion system comprising separable propeller and unmanned aerial vehicle comprising same

 #136
20200161991
2020-05-21

Systems and methods for dynamically triggering independent stator coils to control pitch of a rotor blade

 #137
20200156801
2020-05-21

Hybrid flight vehicle

 #138
20200156783
2020-05-21

Cyclorotor thrust control, transmission and mounting system

 #139
20200156779
2020-05-21

Systems and methods for independent pitch control of rotor blades of rotor assembly to achieve directional control

 #140
20200156774
2020-05-21

Sensor for monitoring rotors

 #141
20200156331
2020-05-21

Bond fixture for root end laminate or rotor blade

 #142
20200148345
2020-05-14

ADAPTIVE FLIGHT CONTROLS

 #143
20200148342
2020-05-14

Systems and methods for improved rotor assembly for use with a stator

 #144
20200148333
2020-05-14

Systems and methods for drive control of a magnetically levitated rotor

 #145
20200122825
2020-04-23

Rotor for an aircraft capable of hovering

 #146
20200108913
2020-04-09

Low-noise multi-propeller system

 #147
20200106310
2020-04-02

Motor having stator including respective laminations having protrusions of caulking dowel portions to secure said laminations

 #148
20200106309
2020-04-02

MOTOR

 #149
20200102070
2020-04-02

Methods and apparatus to recover rotorcraft

 #150
20200087007
2020-03-19

Gearbox cover, port plugs, and mast cap for aircraft

 #151
20200079496
2020-03-12

Pipe props rotary wing

 #152
20200062139
2020-02-27

Aircraft with energy battery for cruise and power battery for take-off and landing

 #153
20200055593
2020-02-20

Rotorcraft flapping lock

 #154
20200031459
2020-01-30

HEAT DISSIPATION SYSTEM FOR ROTOR MOUNTED ELECTRONICS

 #155
20200001990
2020-01-02

AUTOMATICALLY AND RELEASABLY COUPLING UAV PROPELLERS TO PROPULSION MOTORS, AND ASSOCIATED SYSTEMS AND METHODS

 #156
20190382105
2019-12-19

Aerial system propulsion assembly and method of use

 #157
20190372288
2019-12-05

Transmitting power and data together in a rotorcraft using a slip ring assembly

 #158
20190359324
2019-11-28

Multirotor aerial vehicle with automatically rotatable arms

 #159
20190329903
2019-10-31

Autonomous aerial vehicle hardware configuration

 #160
20190329859
2019-10-31

Aircraft drag reduction system and internally cooled motor system and aircraft using same

 #161
20190329858
2019-10-31

Aircraft drag reduction system and internally cooled electric motor system and aircraft using same

 #162
20190300168
2019-10-03

Apparatus and method for removing main rotor blades from main rotor hub yoke

 #163
20190300164
2019-10-03

Centrifugal force bearing

 #164
20190291856
2019-09-26

Systems and methods for reducing the propeller noise

 #165
20190288493
2019-09-19

Flexible coupling for standpipe assembly

 #166
20190283865
2019-09-19

Controlled flight of a multicopter experiencing a failure affecting an effector

 #167
20190276138
2019-09-12

Fan blade support assembly

 #168
20190276128
2019-09-12

UNMANNED AERIAL VEHICLE FUSELAGE

 #169
20190219149
2019-07-18

Aircraft lubrication system

 #170
20190210717
2019-07-11

Yaw moment supplement for directional control

 #171
20190203765
2019-07-04

Uniball bearing with compliant inner member

 #172
20190193849
2019-06-27

Motor for drone and drone including same

 #173
20190193834
2019-06-27

Driving device, propeller, and propulsion system

 #174
20190185155
2019-06-20

Vertical takeoff and landing aircraft

 #175
20190185140
2019-06-20

Combined fan and motor

 #176
20190185139
2019-06-20

SELECTING PROPELLERS FOR PERFORMANCE AND NOISE SHAPING

 #177
20190181701
2019-06-13

Motor for drone and drone comprising same

 #178
20190176978
2019-06-13

Self-tightening rotor

 #179
20190176964
2019-06-13

Corrugated lift fan rotor

 #180
20190168867
2019-06-06

System for transmitting and processing data for controlling a rotor blade actuator

 #181
20190100301
2019-04-04

Power assembly and aircraft

 #182
20190061926
2019-02-28

Low moment rotor hub

 #183
20190032741
2019-01-31

Elastomeric bearing component with wedge-shaped shims

 #184
20180370638
2018-12-27

Method of fabricating rotary equipment for a rotary wing, provided with a deicer, said rotary equipment, and a drone provided with said rotary equipment

 #185
20180354611
2018-12-13

System and method for automation of rotorcraft entry into autorotation and maintenance of stabilized autorotation

 #186
20180354609
2018-12-13

Aircraft with linear thruster arrangement

 #187
20180340570
2018-11-29

Mast space of helicopter, driving power transmission device of helicopter including mast spacer, and helicopter

 #188
20180339773
2018-11-29

Rotor assembly having a ball joint for thrust vectoring capabilities

 #189
20180327089
2018-11-15

Tail rotor integrated damper attachment

 #190
20180327087
2018-11-15

Self-tightening rotor

 #191
20180327086
2018-11-15

Gimbaled Rotor Hub Assembly with Spherical Bearing

 #192
20180305003
2018-10-25

Seals for rotor system fairings

 #193
20180290738
2018-10-11

Constant-velocity joint link with reduced axial stiffness

 #194
20180281949
2018-10-04

SYSTEMS AND METHODS FOR STABILISATION OF AERIAL VEHICLES

 #195
20180281944
2018-10-04

Modular and morphable air vehicle

 #196
20180262015
2018-09-13

Wireless electric field power transfer system, method, transmitter and receiver therefor

 #197
20180222580
2018-08-09

Vertical takeoff and landing aircraft

 #198
20180222579
2018-08-09

Lift rotor and vertical or short take-off and/or landing hybrid aerodyne comprising same

 #199
20180208301
2018-07-26

Rotor assembly and unmanned aerial vehicle having the same

 #200
20180186448
2018-07-05

Rotor units having asymmetric rotor blades

 #201
20180186444
2018-07-05

Operating aerial vehicles with intentionally imbalanced propellers

 #202
20180170534
2018-06-21

Rotor hub bearing system

 #203
20180167043
2018-06-14

Gate drive circuit and method of operating the same

 #204
20180165898
2018-06-14

Rotorcraft structural fault-detection and isolation using virtual monitoring of loads

 #205
20180155009
2018-06-07

Controlled flight of a multicopter experiencing a failure affecting an effector

 #206
20180141650
2018-05-24

Axial springs for rotor hub assembly

 #207
20180141646
2018-05-24

Propulsor hub weight element and balancing method

 #208
20180105263
2018-04-19

Electric propulsion system for a rotary wing aircraft

 #209
20180072412
2018-03-15

Adjustment of track and balance of a multi-blade rotor

 #210
20180067006
2018-03-08

Method and system for measuring torque in a tiltrotor aircraft

 #211
20180043640
2018-02-15

Bond fixture for root end laminate or rotor blade

 #212
20180029700
2018-02-01

Anti-drive mechanism for rise and fall rotating control systems

 #213
20180002007
2018-01-04

Duplicated hydraulic circuit with pressure regulation

 #214
20170371354
2017-12-28

Extensible quadrotor body

 #215
20170341739
2017-11-30

VARIABLE AMPLITUDE FORCE GENERATOR

 #216
20170334546
2017-11-23

Intentionally imbalancing propellers for performance and noise-shaping

 #217
20170327307
2017-11-16

Multicopter-assisted system and method for launching and retrieving a fixed-wing aircraft

 #218
20170327230
2017-11-16

Multicopter-assisted system and method for launching and retrieving a fixed-wing aircraft

 #219
20170327229
2017-11-16

Multicopter-assisted system and method for launching and retrieving a fixed-wing aircraft

 #220
20170327228
2017-11-16

Multicopter-assisted system and method for launching and retrieving a fixed-wing aircraft

 #221
20170327226
2017-11-16

Multicopter-assisted system and method for launching and retrieving a fixed-wing aircraft

 #222
20170327225
2017-11-16

Multicopter-assisted system and method for launching and retrieving a fixed-wing aircraft

 #223
20170327221
2017-11-16

Multicopter-assisted system and method for launching and retrieving a fixed-wing aircraft

 #224
20170327214
2017-11-16

Multicopter-assisted system and method for launching and retrieving a fixed-wing aircraft

 #225
20170327213
2017-11-16

Multicopter-assisted system and method for launching and retrieving a fixed-wing aircraft

 #226
20170327212
2017-11-16

Multicopter-assisted system and method for launching and retrieving a fixed-wing aircraft

 #227
20170327211
2017-11-16

Multicopter-assisted system and method for launching and retrieving a fixed-wing aircraft

 #228
20170327206
2017-11-16

Multicopter-assisted system and method for launching and retrieving a fixed-wing aircraft

 #229
20170313418
2017-11-02

UNMANNED VEHICLE

 #230
20170305543
2017-10-26

SEALED HUB AND SHAFT FAIRING FOR ROTARY WING AIRCRAFT

 #231
20170305542
2017-10-26

Aerial system propulsion assembly and method of use

 #232
20170297738
2017-10-19

Multicopter-assisted system and method for launching and retrieving a fixed-wing aircraft

 #233
20170297697
2017-10-19

Rotorcraft including auxiliary propulsor positioned to ingest boundary layer flow

 #234
20170297690
2017-10-19

Hub separation in dual rotor rotary wing aircraft

 #235
20170297688
2017-10-19

Integrated main rotor hub and shaft

 #236
20170291702
2017-10-12

Collective to elevator mixing of a rotary wing aircraft

 #237
20170291701
2017-10-12

Fiber orientation to allow for automated ply placement with composite rotor yokes

 #238
20170291700
2017-10-12

Impeller-based vehicle propulsion system

 #239
20170283047
2017-10-05

Main rotor rotational speed control for rotorcraft

 #240
20170275014
2017-09-28

Rotorcraft rotor and propeller speed

 #241
20170275006
2017-09-28

Blade heater mat insulation

 #242
20170274994
2017-09-28

Gearbox for a dual rotor, rotary wing aircraft

 #243
20170274987
2017-09-28

Single collective stick for a rotary wing aircraft

 #244
20170259913
2017-09-14

Gimbaled tail rotor hub with spherical elastomeric centrifugal force bearing for blade retention and pitch change articulation

 #245
20170244209
2017-08-24

Slip ring having a liquid metal contact between a stationary element and a rotatable element

 #246
20170233068
2017-08-17

Lift offset control of a rotary wing aircraft

 #247
20170233067
2017-08-17

Independent control for upper and lower rotor of a rotary wing aircraft

 #248
20170225771
2017-08-10

Plate member for reducing drag on a fairing of an aircraft

 #249
20170217582
2017-08-03

Dual rotor, rotary wing aircraft

 #250
20170217578
2017-08-03

Self-tightening rotor

 #251
20170217575
2017-08-03

Active vibration control of a rotorcraft

 #252
20170210463
2017-07-27

Tip clearance measurement of a rotary wing aircraft

 #253
20170190416
2017-07-06

Rotorcraft state control

 #254
20170174317
2017-06-22

Selecting propellers for performance and noise shaping

 #255
20170174316
2017-06-22

Selecting propellers for performance and noise shaping

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