WO2010053450A2 - Pales tandem à extrémités reliées pour éoliennes - Google Patents

Pales tandem à extrémités reliées pour éoliennes Download PDF

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Publication number
WO2010053450A2
WO2010053450A2 PCT/SG2009/000405 SG2009000405W WO2010053450A2 WO 2010053450 A2 WO2010053450 A2 WO 2010053450A2 SG 2009000405 W SG2009000405 W SG 2009000405W WO 2010053450 A2 WO2010053450 A2 WO 2010053450A2
Authority
WO
WIPO (PCT)
Prior art keywords
blade
blade portion
wind turbine
hub
tip
Prior art date
Application number
PCT/SG2009/000405
Other languages
English (en)
Other versions
WO2010053450A3 (fr
Inventor
Kang Lim Chee
Erwin Merijn Wouterson
Haraguchi Yoshiki
Zoe Moore
Original Assignee
Vestas Technology R&D Singapore Pte Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vestas Technology R&D Singapore Pte Ltd filed Critical Vestas Technology R&D Singapore Pte Ltd
Publication of WO2010053450A2 publication Critical patent/WO2010053450A2/fr
Publication of WO2010053450A3 publication Critical patent/WO2010053450A3/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor 
    • F03D1/06—Rotors
    • F03D1/0608—Rotors characterised by their aerodynamic shape
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • 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
    • F05B2260/00—Function
    • F05B2260/50—Kinematic linkage, i.e. transmission of position
    • F05B2260/503—Kinematic linkage, i.e. transmission of position using gears
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • 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
    • F05B2260/00—Function
    • F05B2260/70—Adjusting of angle of incidence or attack of rotating blades
    • F05B2260/74—Adjusting of angle of incidence or attack of rotating blades by turning around an axis perpendicular the rotor centre line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • 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
    • F05B2260/00—Function
    • F05B2260/70—Adjusting of angle of incidence or attack of rotating blades
    • F05B2260/76—Adjusting of angle of incidence or attack of rotating blades the adjusting mechanism using auxiliary power sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • 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
    • F05B2260/00—Function
    • F05B2260/70—Adjusting of angle of incidence or attack of rotating blades
    • F05B2260/79—Bearing, support or actuation arrangements therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

Definitions

  • Embodiments of the present invention relate to the field of wind turbine generators, and particularly to turbine blades for wind turbine generators.
  • Wind turbines generate electricity using wind power.
  • the turbines generally use large blades that are designed to convert wind energy into rotational energy to drive a turbine, which produces the electricity.
  • the blades of large commercial wind turbines can be up to 40 meters or more in length. In present wind turbines, these single blades are attached to a hub of the turbine. These blades are generally produced from a plurality of composite laminated sheets that are joined together to provide structural integrity to the blades during operation. The size and weight of the blades add to the overall cost of the turbines.
  • the blades must also efficiently convert wind energy into rotational energy. They are generally designed to provide as much rotational torque as possible for a given wind condition. In some turbines, the pitch angle of the blades can be adjusted with respect to the hub in order to increase the aerodynamic efficiency of the wind turbine.
  • One aspect of the present invention provides a wind turbine rotor blade system comprising a first blade portion coupled to a wind turbine hub; a second blade portion coupled to the wind turbine hub; and a connector that connects a tip of the first blade portion to a tip of the second blade portion.
  • each of the first blade portion and the second blade portion may be connected to the connector such that a pitch of each blade portion can be independently adjusted.
  • the first blade portion may be coupled to the hub at a first point
  • the second blade portion may be coupled to the hub at a second point that is offset by a distance in a direction perpendicular to a rotational plane of the wind turbine hub.
  • the connector may be connected to the first and second blade tips using a ball and socket joint. In further embodiments, the connector may be connected to the first and second blade tips using roller bearings. The connector may be configured to reduce aerodynamic drag due to the formation of tip vortices.
  • the first blade portion may rotate in a windward plane.
  • the second blade portion may rotate in a downwind plane relative to the first blade portion.
  • An alternate aspect of the present invention provides a wind turbine for generating electricity, the wind turbine comprising: a plurality of rotor blade systems, each rotor blade system comprising: a first blade portion coupled to a wind turbine hub; a second blade portion coupled to the wind turbine hub; and a connector that connects a tip of the first blade portion to a tip of the second blade portion.
  • each of the first blade portion and the second blade portion may be connected to the connector such that a pitch of each blade portion can be independently adjusted.
  • the first blade portion may be coupled to the hub at a first point
  • the second blade portion may be coupled to the hub at a second point that is offset by a distance in a direction parallel to a rotational plane of the wind turbine hub.
  • the connector for each rotor blade system may be connected to the first and second blade tips using a ball and socket joint.
  • the connector for each rotor blade system may be connected to the first and second blade tips using roller bearings.
  • the connector may be configured to reduce aerodynamic drag due to the formation of tip vortices.
  • the first blade portion may rotate in a windward plane and the second blade portion may rotate in a downwind plane relative to the first blade portion.
  • An alternate aspect of the present invention provides a method for producing a wind turbine rotor blade system, the method comprising the steps of: coupling a first blade portion to a wind turbine hub; coupling a second blade portion to the wind turbine hub; and connecting a tip of the first blade portion to a tip of the second blade portion.
  • the connecting step may be performed such that a pitch of each blade portion can be independently adjusted.
  • the connecting step may further comprise connecting the first and second blade tips using a ball and socket joint.
  • the connecting step may further comprise connecting the first and second blade tips using roller bearings.
  • Figure 1 illustrates a perspective view of a wind turbine generator equipped with the tandem blade system of the present invention
  • Figure 2 illustrates a perspective view of an end portion of one embodiment of a tandem blade system according to the present invention
  • Figure 3 illustrates a side view of one embodiment of an endplate to join the blade tips of the two blades of the tandem blade system of Figures 1 and 2;
  • Figure 4 illustrates a side view of an alternate embodiment of an endplate for joining the blade tips of the tandem blade system of Figure 2;
  • Figure 5 illustrates a top view of one embodiment of a means to adjust a pitch angle of the tandem blade system of Figure 2;
  • Figure 6 illustrates a top view of an alternate embodiment of a means to adjust a pitch angle of the tandem blade system of Figure 2;
  • Figure 7 is a flow chart illustrating one method of producing the tandem blade system of Figures 2-6.
  • FIG 1 illustrates a perspective view of one embodiment of a wind power generator, designated generally as reference numeral 10, that is capable of using a tandem blade system according to the present invention.
  • Figure 2 illustrates a perspective view of an end portion of one embodiment of a tandem blade system 100.
  • the wind power generator 10 includes a plurality of tandem blade systems 100 mounted on a hub 410 ( Figure 5).
  • the hub 410 is rotatably attached to a generator 20 that produces electricity when the hub 410 rotates as a result of air currents acting on the tandem blade systems 100.
  • the generator 20 is coupled to a tower 30 having a sufficient height to allow the tandem blade systems 100 to rotate freely when the wind blows.
  • FIG. 1 shows three tandem blade systems 100 connected to the hub 410, it is understood that two or more tandem blade systems may be used.
  • the embodiments of the generator 10 and tandem blade system 100 shown and described are provided by way of example only.
  • FIG. 2 illustrates a perspective view of an end portion of one embodiment of the tandem blade system 100.
  • the system 100 includes a first blade portion 110 and a second blade portion 120.
  • the first blade portion 110 has blade tip 1 12, while the second blade portion 120 has a blade tip 122.
  • the blade tips 112, 122 are joined together using an endplate or connector 130.
  • the endplate 130 provides a smooth and continuous extension of the blade tip profile of the blade tips 112, 122.
  • Figure 3 illustrates a side view of one embodiment of the endplate 130 joining the blade tips 112, 122 of the two blade portions 1 10, 120 of the tandem blade system 100 of Figure 1.
  • a ball 1 14 is coupled to the blade tip 112
  • a ball 124 is coupled to the blade tip 122.
  • a corresponding socket 132 connects the endplate 130 to the ball 114 of the blade 1 10.
  • a corresponding socket 134 connects the endplate 130 to the ball 124 of the blade portion 120.
  • the balls 114, 124 and sockets 132, 134 allow the blade portions 1 10, 120 to move with respect to the end plate 130. This will be discussed in more detail below with reference to Figures 4 and 5.
  • the balls 114, 124 may be coupled to the blade tips 112, 122 by various means.
  • the balls 114, 124 may be integrally formed as part of the blade portions 1 10, 120 during the manufacturing process.
  • the blade portions 110, 120 and balls 1 14, 124 respectively may be made from various composite materials known to those of skill in the art.
  • the balls 1 14, 124 may be coupled to the blade tips 112, 122 using, for example, various types of adhesives.
  • the adhesives may include Polyurethane (PU) or Epoxy glue.
  • Figure 4 illustrates a side view of an alternate embodiment of an endplate or connector 230 joining the blade tips 112, 122 of the two blade portions 110, 120 of the tandem blade system 100 of Figure 1.
  • a post 115 is coupled to the blade tip 1 12, while a post 125 is coupled to the blade tip 122.
  • a first roller bearing 1 16 is used to connect the post 115 to a corresponding opening 232 in the endplate 230.
  • a second roller bearing 126 is used to connect the post 125 to a corresponding opening 234 in the endplate 230.
  • Each of the roller bearings 116, 126 allow the blade portions 1 10, 120 to move slightly with respect to the end plate 130. This will be discussed in more detail below with reference to Figures 5 and 6.
  • the posts 115, 125 may be coupled to the blade tips 112, 122 by various means.
  • the posts 115, 125 may be integrally formed as part of the blade portions 110, 120 during the manufacturing process.
  • the blade portions 110, 120 and posts 115, 125 may be made from various composite materials known to those of skill in the art.
  • the posts 115, 125 may be coupled to the blade tips 112, 122 by various means.
  • the posts 115, 125 may be integrally formed as part of the blade portions 110, 120 during the manufacturing process.
  • the blade portions 110, 120 and posts 115, 125 may be made from various composite materials known to those of skill in the art.
  • the posts 115, 125 may be coupled to the blade tips 112, 122 by various means.
  • the posts 115, 125 may be integrally formed as part of the blade portions 110, 120 during the manufacturing process.
  • the blade portions 110, 120 and posts 115, 125 may be made from various composite materials known to those of skill in the art.
  • 115, 125 may be coupled to the blade tips 112, 122, respectively using, for example, various types of adhesives, as previously discussed.
  • FIG. 5 illustrates a top view of one embodiment of a means, designated generally as reference numeral 400, to adjust a pitch of the tandem blade system 100 of Figure 1.
  • each of the blade portions 1 10, 120 are pivotally connected to a hub 410 of a wind turbine generator (not shown).
  • the first blade portion 1 10 is capable of pivoting about an axis 412 that extends along the length of the first blade portion 1 10.
  • the second blade portion 120 is capable of pivoting about an axis 414 that extends along the length of the second blade portion 120.
  • the pitch of the blade portions 1 10, 120 can be adjusted by pivoting the blade portions 110, 120 about the respective axes 412, 414.
  • a hydraulic cylinder 430 connected to each of the blade portions 110, 120 provides the force required to pivot the blades.
  • the hydraulic cylinder 430 is shown extending beyond the periphery of the hub 410. However, it is understood that, in some embodiments, the hydraulic cylinder 430 may be completely contained within the hub 410.
  • the pitch angle of the blades 110, 120 can be changed within a range of from about -10 degrees to about +30 degrees.
  • the pitch angle may be adjusted, for example, depending on the wind speed, in order to provide for the efficient conversion of wind energy into rotational torque.
  • the hydraulic cylinder 430 exerts a linear force on a first shaft 432.
  • the first shaft 432 is pivotally coupled to the second blade 120 at connection point 434.
  • the first shaft 432 is connected to a second shaft 432a that extends between connection point 434 and a connection point 436 on first blade portion 110.
  • the shaft 432 may be a single piece.
  • a pin or other connector attached to each of the first and second blade portions 1 10, 120 may extend through the shaft 432 to provide the rotational force.
  • the pitching system is controlled as a function of the wind speed. The pitch angle of the blades may be adjusted for maximum aerodynamic efficiency, as well as to regulate power production and maintain rated power.
  • the hub 410 rotates in a direction indicated by arrow 420.
  • the system 100 may be adapted to rotate in the other direction as well.
  • the first blade portion 110 is in the downwind plane from the second blade portion 120, which is in the windward plane.
  • the first axis 412 and the second axis 414 are slightly offset from each other in a direction parallel to a rotational plane of the wind turbine 10. This offset is shown as reference numeral 416.
  • Figure 6 illustrates a top view of an alternate embodiment of a means, designated generally as reference numeral 500, to adjust a pitch of the tandem blade system
  • each of the blade portions 110, 120 are pivotally connected to a hub 510 of a wind turbine generator (not shown).
  • the first blade portion 110 is capable of pivoting about an axis 512 that extends along the length of the first blade portion 1 10.
  • the second blade portion 120 is capable of pivoting about an axis 514 that extends along the length of the second blade portion 120.
  • the pitch of the blade portions 110, 120 can be adjusted by pivoting the blade portions 110, 120 about the respective axes 512, 514.
  • the blade portion 110 includes a ring gear 538 on an inside surface. A corresponding pinion gear 536 can then be driven to pivot the blade portion 110.
  • the blade portion 120 includes a ring gear 534 on an inside surface. A corresponding pinion gear 532 can then be driven to pivot the blade portion 120.
  • tandem blade pitching system of Figures 5 and 6 illustrate a hub attachment for a single tandem blade, it is understood that similar structure may be found on all of the tandem blade systems 100 attached to the hub.
  • Figure 7 shows a flow chart illustrating one embodiment of a method, designated generally with reference numeral 600, for producing the tandem blade system of
  • the method 600 includes a first step of coupling a first blade portion
  • the next step is to couple a second blade portion 120 to the wind turbine hub 410, 510, as shown with reference numeral 602.
  • the next step is to couple a second blade portion 120 to the wind turbine hub 410, 510, as shown with reference numeral 604.
  • the final step in the method 600 is connecting a tip of the first blade portion 110 to a tip of the second blade portion 220, as shown with reference numeral 606.
  • the connecting step may optionally be performed such that a pitch of each blade portion 1 10, 120 can be independently adjusted. Additional alternatives may include coupling the first blade portion 110 to the hub at a first point, and coupling the second blade portion 120 to the hub at a second point that is offset by a distance in a direction parallel to a rotational plane of the wind turbine hub.
  • the connecting step may include connecting the first and second blade tips using a ball and socket joint.
  • the connecting step may include connecting the first and second blade tips using roller bearings.
  • Embodiments of the present invention provide several advantages over traditional single blade wind power generators.
  • the system provides for increased structural efficiency. By having two blades rotating in tandem and joined at the tip end, the overall structure is very strong and stiff. Hence, each blade can be made much thinner, especially at the root end, thereby saving on material costs.
  • the tip-joint structure behaves like a closed winglet, and therefore reduces aerodynamic induced drag due to tip vortices or tip losses. This will in turn improve the overall efficiency in power generation of the wind turbine.
  • the increased number of blades also allows the tip speed of the wind turbine blades to be reduced since the blades can be made shorter for the same rated power production. Hence, the noise emission of the blades can be significantly reduced.
  • the improvement in structural stiffness may be determined by detailed structural and aero-elastic analysis.
  • the aerodynamic design of the two blades can also be further optimized to benefit from constructive interference between the windward and downwind blades.
  • the improvement in aerodynamic efficiency can be calculated by obtaining the improved lift-to-drag coefficient of the tandem blades compared to a single blade. For the same rated power production and tip-speed ratio, the length of the tandem blades can thus be reduced, resulting in a corresponding lower tip speed. This provides greater efficiency in power generation for a given blade length and rotational speed, as well as a reduction in the amount of noise produced by the wind turbine.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Wind Motors (AREA)

Abstract

Selon des modes de réalisation, la présente invention porte sur un système de pales d'éolienne qui comporte une première partie de pale couplée à un moyeu d'éolienne; une seconde partie de pale couplée au moyeu d'éolienne, et un élément de liaison qui relie une extrémité de la première partie de pale à une extrémité de la seconde partie de pale. Dans certains modes de réalisation, chacune de la première partie de pale et de la seconde partie de pale peut être reliée à l'élément de liaison de telle sorte qu'une inclinaison de chaque partie de pale peut être réglée indépendamment. Le système peut également comprendre divers moyens couplés au moyeu et aux première et seconde parties de pale pour régler une inclinaison de chacune des première et seconde pales.
PCT/SG2009/000405 2008-11-05 2009-11-04 Pales tandem à extrémités reliées pour éoliennes WO2010053450A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11141908P 2008-11-05 2008-11-05
US61/111,419 2008-11-05

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WO2010053450A2 true WO2010053450A2 (fr) 2010-05-14
WO2010053450A3 WO2010053450A3 (fr) 2011-05-05

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202012005356U1 (de) 2012-05-30 2012-07-10 Petra Staude Rotorblatt für Windturbinen mit Profilen in Tandemanordnung
WO2014056507A1 (fr) * 2012-10-12 2014-04-17 Aalborg Universitet Rotor d'éolienne à pales jointes
WO2015055958A1 (fr) * 2013-10-18 2015-04-23 Manceau Sébastien Eolienne a axe de rotation horizontal comprenant des familles de pales
DE102015011260A1 (de) * 2015-08-26 2017-03-02 Horst Löwe Windkraftanlage mit mehr als einem Flügel je Flügelflansch des Rotors
US20170174323A1 (en) * 2015-12-17 2017-06-22 Amazon Technologies, Inc. Redundant Aircraft Propulsion System Using Co-rotating Propellers Joined By Tip Connectors
US20170174337A1 (en) * 2015-12-17 2017-06-22 Amazon Technologies, Inc. Redundant Aircraft Propulsion System Using Multiple Motors Per Drive Shaft
US10208733B2 (en) * 2016-07-19 2019-02-19 Michael L Barrows Tandem tip-joined rotor blade and hub coupling for passive pitch angle control
EP3325772A4 (fr) * 2015-07-21 2019-03-20 Winnova Energy LLC Système et procédé d'amélioration de l'efficacité de pales de turbine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0064742A2 (fr) * 1981-05-07 1982-11-17 Ficht GmbH Rotor pour centrale éolienne
FR2609506A1 (fr) * 1987-01-08 1988-07-15 Lepoix Louis Turbine multi-usage
EP1365106A1 (fr) * 2001-01-26 2003-11-26 Y & Y Co., Ltd. Machine a fluide
WO2009146541A1 (fr) * 2008-06-04 2009-12-10 St-Germain Andre Turbine éolienne d'axe horizontal

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0064742A2 (fr) * 1981-05-07 1982-11-17 Ficht GmbH Rotor pour centrale éolienne
FR2609506A1 (fr) * 1987-01-08 1988-07-15 Lepoix Louis Turbine multi-usage
EP1365106A1 (fr) * 2001-01-26 2003-11-26 Y & Y Co., Ltd. Machine a fluide
WO2009146541A1 (fr) * 2008-06-04 2009-12-10 St-Germain Andre Turbine éolienne d'axe horizontal

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202012005356U1 (de) 2012-05-30 2012-07-10 Petra Staude Rotorblatt für Windturbinen mit Profilen in Tandemanordnung
WO2014056507A1 (fr) * 2012-10-12 2014-04-17 Aalborg Universitet Rotor d'éolienne à pales jointes
EP2906819B1 (fr) 2012-10-12 2017-05-03 Joint Blade Rotor A/S Système de rotor à pales jointes
US9822760B2 (en) 2012-10-12 2017-11-21 Joint Blade Rotor A/S Joined blade wind turbine rotor
WO2015055958A1 (fr) * 2013-10-18 2015-04-23 Manceau Sébastien Eolienne a axe de rotation horizontal comprenant des familles de pales
FR3012180A1 (fr) * 2013-10-18 2015-04-24 Sebastien Manceau Eolienne a axe de rotation horizontal comprenant des familles de pales
US11391264B2 (en) 2013-10-18 2022-07-19 Sebastien Manceau Horizontal axis wind turbine comprising families of blades
EP3325772A4 (fr) * 2015-07-21 2019-03-20 Winnova Energy LLC Système et procédé d'amélioration de l'efficacité de pales de turbine
DE102015011260A1 (de) * 2015-08-26 2017-03-02 Horst Löwe Windkraftanlage mit mehr als einem Flügel je Flügelflansch des Rotors
US20170174323A1 (en) * 2015-12-17 2017-06-22 Amazon Technologies, Inc. Redundant Aircraft Propulsion System Using Co-rotating Propellers Joined By Tip Connectors
US10232933B2 (en) * 2015-12-17 2019-03-19 Amazon Technologies, Inc. Redundant aircraft propulsion system using co-rotating propellers joined by tip connectors
US10086933B2 (en) * 2015-12-17 2018-10-02 Amazon Technologies, Inc. Redundant aircraft propulsion system using multiple motors per drive shaft
US20170174337A1 (en) * 2015-12-17 2017-06-22 Amazon Technologies, Inc. Redundant Aircraft Propulsion System Using Multiple Motors Per Drive Shaft
US10208733B2 (en) * 2016-07-19 2019-02-19 Michael L Barrows Tandem tip-joined rotor blade and hub coupling for passive pitch angle control

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