CA1151072A - Vertical axis wind turbine and curved slender airfoil therefor - Google Patents
Vertical axis wind turbine and curved slender airfoil thereforInfo
- Publication number
- CA1151072A CA1151072A CA000381813A CA381813A CA1151072A CA 1151072 A CA1151072 A CA 1151072A CA 000381813 A CA000381813 A CA 000381813A CA 381813 A CA381813 A CA 381813A CA 1151072 A CA1151072 A CA 1151072A
- Authority
- CA
- Canada
- Prior art keywords
- airfoil
- spanwise
- cranked
- adjoining
- straight
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired
Links
- 239000000543 intermediate Substances 0.000 claims description 12
- 238000010276 construction Methods 0.000 claims description 6
- 230000000875 corresponding effect Effects 0.000 claims 4
- 239000011888 foil Substances 0.000 claims 1
- 238000007689 inspection Methods 0.000 description 3
- 239000003351 stiffener Substances 0.000 description 2
- 230000005611 electricity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
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
- F03D3/00—Wind motors with rotation axis substantially perpendicular to the air flow entering the rotor
- F03D3/06—Rotors
- F03D3/062—Rotors characterised by their construction elements
-
- 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
- F05B2240/00—Components
- F05B2240/20—Rotors
- F05B2240/21—Rotors for wind turbines
- F05B2240/211—Rotors for wind turbines with vertical axis
- F05B2240/212—Rotors for wind turbines with vertical axis of the Darrieus type
-
- 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
- F05B2240/00—Components
- F05B2240/20—Rotors
- F05B2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
- F05B2240/302—Segmented or sectional blades
-
- 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
- F05B2250/00—Geometry
- F05B2250/70—Shape
- F05B2250/71—Shape curved
-
- 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
- Y02E10/74—Wind turbines with rotation axis perpendicular to the wind direction
Landscapes
- Engineering & Computer Science (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
ABSTRACT OF THE DISCLOSURE
A wind turbine generator of the Darrieus type and more particularly a curved slender airfoil for such wind turbine generator characterized by that airfoil compri-sing a pair of straight opposite end portions and a curved intermediate sector portion cooperatively approximating a troposkein shape coextensive spanwise with the airfoil; the intermediate sector portion being made of a plurality of straight airfoil sections joined one to another end to end in the spanwise direction with cranked connections, joining the airfoil sections one to another and including at least one cranked connector at each joint holding the corresponding pair of straight airfoil sections in predetermined angular relationship relative one to the other.
A wind turbine generator of the Darrieus type and more particularly a curved slender airfoil for such wind turbine generator characterized by that airfoil compri-sing a pair of straight opposite end portions and a curved intermediate sector portion cooperatively approximating a troposkein shape coextensive spanwise with the airfoil; the intermediate sector portion being made of a plurality of straight airfoil sections joined one to another end to end in the spanwise direction with cranked connections, joining the airfoil sections one to another and including at least one cranked connector at each joint holding the corresponding pair of straight airfoil sections in predetermined angular relationship relative one to the other.
Description
_ELD OF THE INVENTION
This invention relates to a vertical axis wind turbine generator of the Darrieus type and to a curved slender airfoil of the type used for such wind turbine generator.
DESCRIPTION OF THE PRIOR ART
Up to now such blade or airfoil has been manufactured as a unit and this resulted in manufacturing problems to produce it with the required length and curva-- 10 ture. Such curved slender airfoil are now desired in lengths up to about 100 meters or 300 feet and with a curvature defined by a troposkein shape.
SUMMARY OF THE INVENTION
It is a general object of the present invent-ion to provide a curved slender airfoil of the above type that can be conveniently manufactured, transported, and installed.
It is a more specific object of the present invention to provide a curved slender airfoil of the above type that is of simplified construction and in particular of simplified curvature and constructed and arranged to be assembled from a plurality of similar airfoil sections connecting end to end spanwise.
~151072 It is a still more specific object of the present invention to provide a curved slender airfoil of the above type that is made with a spanwise curvature approxima-ting a troposkein and simulated by a plurality of straight airfoil sections joined end to end spanwise by appropriately cranked connectors provided at the joints between those sections.
This invention defines a wind turbine genera-tor of the Darrieus type and more particularly a curved slender airfoil for such wind turbine generator characterized by that airfoil comprising a pair of straight opposite end portions and a curved intermediate sector portion cooperative-ly approximating a troposkein shape coextensive spanwise with the airfoil; the intermediate sector portion being made of a plurality of straight airfoil sections joined one to another end to end in the spanwise direction with cranked connections joining the airfoil sections one to another and including at least one cranked connector at each joint holding the corresponding pair of straight airfoil sections in predeter-mined angular relationship relative ont to the other.
BRIEF DESCRIPTION OF THE DRAWINGS
The above and other objects and advantagesof the present invention will be better understood with reference to the followïng detailed description of a prefer-red embodiment thereof which is illustrated, by way of exam-ple, in the accompanying drawings; in which:
llSlO~Z
Figure 1 is an elevation view of a wind tur-bine generator provided with airfoils according to the present invention;
Figure 2 is a cross-sectional view of the same joint as seen along line 2-Z in Figure l;
Figure 3, 5 and 6 are cross-se~tional views as seen along lines 3-3, 5-5, and 6-6 respectively in Figure
This invention relates to a vertical axis wind turbine generator of the Darrieus type and to a curved slender airfoil of the type used for such wind turbine generator.
DESCRIPTION OF THE PRIOR ART
Up to now such blade or airfoil has been manufactured as a unit and this resulted in manufacturing problems to produce it with the required length and curva-- 10 ture. Such curved slender airfoil are now desired in lengths up to about 100 meters or 300 feet and with a curvature defined by a troposkein shape.
SUMMARY OF THE INVENTION
It is a general object of the present invent-ion to provide a curved slender airfoil of the above type that can be conveniently manufactured, transported, and installed.
It is a more specific object of the present invention to provide a curved slender airfoil of the above type that is of simplified construction and in particular of simplified curvature and constructed and arranged to be assembled from a plurality of similar airfoil sections connecting end to end spanwise.
~151072 It is a still more specific object of the present invention to provide a curved slender airfoil of the above type that is made with a spanwise curvature approxima-ting a troposkein and simulated by a plurality of straight airfoil sections joined end to end spanwise by appropriately cranked connectors provided at the joints between those sections.
This invention defines a wind turbine genera-tor of the Darrieus type and more particularly a curved slender airfoil for such wind turbine generator characterized by that airfoil comprising a pair of straight opposite end portions and a curved intermediate sector portion cooperative-ly approximating a troposkein shape coextensive spanwise with the airfoil; the intermediate sector portion being made of a plurality of straight airfoil sections joined one to another end to end in the spanwise direction with cranked connections joining the airfoil sections one to another and including at least one cranked connector at each joint holding the corresponding pair of straight airfoil sections in predeter-mined angular relationship relative ont to the other.
BRIEF DESCRIPTION OF THE DRAWINGS
The above and other objects and advantagesof the present invention will be better understood with reference to the followïng detailed description of a prefer-red embodiment thereof which is illustrated, by way of exam-ple, in the accompanying drawings; in which:
llSlO~Z
Figure 1 is an elevation view of a wind tur-bine generator provided with airfoils according to the present invention;
Figure 2 is a cross-sectional view of the same joint as seen along line 2-Z in Figure l;
Figure 3, 5 and 6 are cross-se~tional views as seen along lines 3-3, 5-5, and 6-6 respectively in Figure
2; and Figure 4 is an exploded view of a joint bet-ween adjoining ends of a pair of straight airfoil sections.
. The illustrated wind turbine generator accord-ing to the present invention and as shown in Figure 1 inclu-des a wind actuated rotor comprising a shaft 10 defining a vertical axis of rotation. The shaft 10 is connected to a turbine 11 of any appropriate type to generate electricity in a power house 12. The shaft 10 is restrained laterally and vertically at its upper end by guy wires 13 attached to the outer race of an ap~ropriate bearing 14.
The wind actuated rotor includes one or more curved slender airfoils 15 each connected to the shaft 10 at its lower and upper ends through rings 16 and 17 and inter-mediate its ends by a pair of radial struts 18. Each curved slender airfoil 15 includes a pair of straight opposite end portions 19 and an intermediate sector portion extending spanwise in the sector defined between the radial struts 18.
~15~72 It is known in the art that th~ preIerred spanwise shape for such vertical axis airfoil i~-~ a troposkein shape or in other words the natural curved shape that is defined by a cable similarly rotating about a vertical axis. The intermediate sector portion is made with a fixed radius curvature approxi-mating the troposkein shape in the corresponding sector defined between the horizontal struts 18. The straight opposite end portions 19 also approximate the corresponding portion of the natural troposkein shape. Thus, as a whole, each airfoil 15 approximates the corresponding natural tropos-kein shape to produce the aerodynamic performance obtainable with the preferred troposkein shape.
The intermediate sector portion is made of a plurality of similar straight airfoil sections 20 that are joined, one to another end to end spanwise and cranked at tne joints 21 to simulate the fixed radius curvature that approximates the troposkein shape.
The cranked connection at a joint 21 between two adjoining straight airfoil sections 20 is shown in details in Figures 2 to 6 inclusive. Each airfoil section 20 includes a pair of parallel spars 21, 22 and interconnecting ribs 23, 24 and 25. The connection at this joint 21 between each adjoining pair of straight airfoil sections 20 includes a pair of spar splices 26. Each splice 26 forms a channel construction with a stiffener 27 transversely interconnecting the opposite flanges 28. Each spar splice fits against the web and between the flanges of the corresponding spar 21 or 22. A pair of angles 29 are secured longitudinally of the ~15~Z
flanges 28 on the opposite sides of each spar relative to the spar splice 26. As best seen in Figure 3, the spar splices 26 and angles 28, 29 are cranked in the longitudinal direct-ion with the appropriate angle to match the calculated angle between each pair of adjoining airfoil sections 20.
The ribs 23 and 25 are integrally formed along opposite edges of corresponding metal sheets 30 and 31 respectively. The latter are also integrally beaded as shown to give reinforcement. A leading edge access skin panel 32 and a trailing edge access skin panel 33 are provided to allow assembly and inspection at each joint 21 and to comple-te the skin. The ribs 24 include opposite flanges 34 that are secured to the adjoining ends of the main skin panel 35 at each joint and that are transversely cranked at the predetermined angle, also formed in the spar splices 26.
Stiffeners 36 are provided to join the corresponding pair of ribs 24. A pair of straps 37 are secured longitudinally over the joint between the panels 35. An assembly and inspection hatch 38 removably closes an inspection aperture 39.
. The illustrated wind turbine generator accord-ing to the present invention and as shown in Figure 1 inclu-des a wind actuated rotor comprising a shaft 10 defining a vertical axis of rotation. The shaft 10 is connected to a turbine 11 of any appropriate type to generate electricity in a power house 12. The shaft 10 is restrained laterally and vertically at its upper end by guy wires 13 attached to the outer race of an ap~ropriate bearing 14.
The wind actuated rotor includes one or more curved slender airfoils 15 each connected to the shaft 10 at its lower and upper ends through rings 16 and 17 and inter-mediate its ends by a pair of radial struts 18. Each curved slender airfoil 15 includes a pair of straight opposite end portions 19 and an intermediate sector portion extending spanwise in the sector defined between the radial struts 18.
~15~72 It is known in the art that th~ preIerred spanwise shape for such vertical axis airfoil i~-~ a troposkein shape or in other words the natural curved shape that is defined by a cable similarly rotating about a vertical axis. The intermediate sector portion is made with a fixed radius curvature approxi-mating the troposkein shape in the corresponding sector defined between the horizontal struts 18. The straight opposite end portions 19 also approximate the corresponding portion of the natural troposkein shape. Thus, as a whole, each airfoil 15 approximates the corresponding natural tropos-kein shape to produce the aerodynamic performance obtainable with the preferred troposkein shape.
The intermediate sector portion is made of a plurality of similar straight airfoil sections 20 that are joined, one to another end to end spanwise and cranked at tne joints 21 to simulate the fixed radius curvature that approximates the troposkein shape.
The cranked connection at a joint 21 between two adjoining straight airfoil sections 20 is shown in details in Figures 2 to 6 inclusive. Each airfoil section 20 includes a pair of parallel spars 21, 22 and interconnecting ribs 23, 24 and 25. The connection at this joint 21 between each adjoining pair of straight airfoil sections 20 includes a pair of spar splices 26. Each splice 26 forms a channel construction with a stiffener 27 transversely interconnecting the opposite flanges 28. Each spar splice fits against the web and between the flanges of the corresponding spar 21 or 22. A pair of angles 29 are secured longitudinally of the ~15~Z
flanges 28 on the opposite sides of each spar relative to the spar splice 26. As best seen in Figure 3, the spar splices 26 and angles 28, 29 are cranked in the longitudinal direct-ion with the appropriate angle to match the calculated angle between each pair of adjoining airfoil sections 20.
The ribs 23 and 25 are integrally formed along opposite edges of corresponding metal sheets 30 and 31 respectively. The latter are also integrally beaded as shown to give reinforcement. A leading edge access skin panel 32 and a trailing edge access skin panel 33 are provided to allow assembly and inspection at each joint 21 and to comple-te the skin. The ribs 24 include opposite flanges 34 that are secured to the adjoining ends of the main skin panel 35 at each joint and that are transversely cranked at the predetermined angle, also formed in the spar splices 26.
Stiffeners 36 are provided to join the corresponding pair of ribs 24. A pair of straps 37 are secured longitudinally over the joint between the panels 35. An assembly and inspection hatch 38 removably closes an inspection aperture 39.
Claims (6)
1. A curved slender airfoil assembly comprising a plurality of straight airfoil sections joined one to another end to end in the spanwise direction and cooperatively defining an approximate spanwise curvature, a cranked connect-ion joining each adjoining pair of the airfoil sections in predetermining angular relationship relative one to the other in the spanwise direction, and the cranked connection including at least one connector member extending spanwise in overlapping relationship with the adjoining ends of the corresponding pair of adjoining airfoil sections and having a cranked outline in said spanwise direction matching said predetermined angular relationship.
2. A curved slender airfoil assembly as defined in claim 1, wherein said straight airfoil sections include a spar and rib construction having at least one spar and with said one connector member operatively overlapping and connecting the adjoining ends of the one spar of the corres-ponding pair of adjoining airfoil sections.
3. A curved slender airfoil assembly as defined in claim 2, wherein the one connector member is of channel shape including a web with transversely opposite longitudinal edges and flanges each defining a broken out line extending in the spanwise direction and matching said predetermined angular relationship.
4. A curved slender airfoil assembly as defined in claim 3, wherein the straight airfoil sections are of essentially the same construction including each a spar and rib construction and an aerodynamically profiled skin, any of the cranked connection includes connection panels operati-vely overlapping one end of the spar and rib construction of the corresponding adjoining airfoil sections.
5. A curved slender airfoil assembly as defined in claim 1, comprising an airfoil for a Darrieus type wind generator including an intermediate sector portion formed with a fixed radius curvature approximating the natural troposkein shape coextensive spanwise with the same interme-diate sector, and formed by said plurality of straight air-foil sections extending spanwise coextensive with the inter-mediate sector portion.
6. A darrieus type wind generator comprising a central shaft defining a rotation axis, a wind actuated rotor rotatable on the central shaft about said axis, said rotor including a plurality of curved slender airfoils, each of the latter including an intermediate sector portion formed with a fixed radius curvature approximating the natural troposkein shape coextensive spanwise with the same intermediate sector portion, the intermediate sector portion of each airfoil including a plurality of straight airfoil sections joined one to another, end to end, in the spanwise direction, and cooperatively simulating the fixed radius curvature, a cranked connection joining each adjoining pair of the airfoil sections in predetermined angular relationship relative one to the other in the spanwise direction, and the cranked connection including at least one connector member extending spanwise in overlapping relationship with the adjoining ends of the corresponding pair of adjoining airfoil sections, and having a cranked outline in the spanwise direction matching said predetermined angular relationship.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000381813A CA1151072A (en) | 1981-07-15 | 1981-07-15 | Vertical axis wind turbine and curved slender airfoil therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000381813A CA1151072A (en) | 1981-07-15 | 1981-07-15 | Vertical axis wind turbine and curved slender airfoil therefor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1151072A true CA1151072A (en) | 1983-08-02 |
Family
ID=4120445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000381813A Expired CA1151072A (en) | 1981-07-15 | 1981-07-15 | Vertical axis wind turbine and curved slender airfoil therefor |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1151072A (en) |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6790007B2 (en) | 2001-09-06 | 2004-09-14 | Mitch Gingras | Wind turbine structure |
| WO2008089765A3 (en) * | 2007-01-25 | 2008-09-18 | Univ Danmarks Tekniske | Reinforced blade for wind turbine |
| WO2010023299A2 (en) * | 2008-08-31 | 2010-03-04 | Vestas Wind Systems A/S | A sectional blade |
| CN102031997A (en) * | 2009-10-01 | 2011-04-27 | 维斯塔斯风力系统有限公司 | Wind turbine blade |
| US8454318B2 (en) | 2006-12-15 | 2013-06-04 | Bladena Aps | Reinforced aerodynamic profile |
| US8485786B2 (en) | 2007-01-16 | 2013-07-16 | Bladena Aps | Reinforced blade for wind turbine |
| US8807953B2 (en) | 2008-06-24 | 2014-08-19 | Bladena Aps | Reinforced wind turbine blade |
| US8823199B2 (en) | 2011-11-25 | 2014-09-02 | Rupert Stephen Tull de Salis | Fluid driven turbine |
| US8985948B2 (en) | 2012-02-21 | 2015-03-24 | Clean Green Energy LLC | Fluid driven vertical axis turbine |
| US9388789B2 (en) | 2009-12-02 | 2016-07-12 | Vestas Wind Systems A/S | Sectional wind turbine blade |
| US9416768B2 (en) | 2009-12-02 | 2016-08-16 | Bladena Aps | Reinforced airfoil shaped body |
| US9765756B2 (en) | 2008-05-07 | 2017-09-19 | Vestas Wind Systems A/S | Sectional blade |
| US10208734B2 (en) | 2015-04-23 | 2019-02-19 | Continuum Dynamics, Inc. | Lift-driven wind turbine with force canceling blade configuration |
| US10344742B2 (en) | 2015-04-23 | 2019-07-09 | Continuum Dynamics, Inc. | Hybrid vertical/horizontal axis wind turbine for deep-water offshore installations |
-
1981
- 1981-07-15 CA CA000381813A patent/CA1151072A/en not_active Expired
Cited By (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6790007B2 (en) | 2001-09-06 | 2004-09-14 | Mitch Gingras | Wind turbine structure |
| US8454318B2 (en) | 2006-12-15 | 2013-06-04 | Bladena Aps | Reinforced aerodynamic profile |
| US8485786B2 (en) | 2007-01-16 | 2013-07-16 | Bladena Aps | Reinforced blade for wind turbine |
| US8632312B2 (en) | 2007-01-25 | 2014-01-21 | Bladena Aps | Reinforced blade for wind turbine |
| WO2008089765A3 (en) * | 2007-01-25 | 2008-09-18 | Univ Danmarks Tekniske | Reinforced blade for wind turbine |
| US9765756B2 (en) | 2008-05-07 | 2017-09-19 | Vestas Wind Systems A/S | Sectional blade |
| US9784240B2 (en) | 2008-06-24 | 2017-10-10 | Bladena Solutions Aps | Reinforced wind turbine blade |
| US8807953B2 (en) | 2008-06-24 | 2014-08-19 | Bladena Aps | Reinforced wind turbine blade |
| WO2010023299A3 (en) * | 2008-08-31 | 2010-12-16 | Vestas Wind Systems A/S | A sectional blade |
| WO2010023299A2 (en) * | 2008-08-31 | 2010-03-04 | Vestas Wind Systems A/S | A sectional blade |
| CN102031997A (en) * | 2009-10-01 | 2011-04-27 | 维斯塔斯风力系统有限公司 | Wind turbine blade |
| EP2357357A2 (en) * | 2009-10-01 | 2011-08-17 | Vestas Wind Systems A/S | Wind turbine blade |
| EP2357357A3 (en) * | 2009-10-01 | 2014-03-19 | Vestas Wind Systems A/S | Wind turbine blade |
| US9388789B2 (en) | 2009-12-02 | 2016-07-12 | Vestas Wind Systems A/S | Sectional wind turbine blade |
| US9416768B2 (en) | 2009-12-02 | 2016-08-16 | Bladena Aps | Reinforced airfoil shaped body |
| US8823199B2 (en) | 2011-11-25 | 2014-09-02 | Rupert Stephen Tull de Salis | Fluid driven turbine |
| US8985948B2 (en) | 2012-02-21 | 2015-03-24 | Clean Green Energy LLC | Fluid driven vertical axis turbine |
| US9970410B2 (en) | 2012-02-21 | 2018-05-15 | Clean Green Energy LLC | Installation and erection assembly for an elongated structure |
| US10808677B2 (en) | 2012-02-21 | 2020-10-20 | Clean Green Energy LLC | Fluid driven vertical axis turbine |
| US10208734B2 (en) | 2015-04-23 | 2019-02-19 | Continuum Dynamics, Inc. | Lift-driven wind turbine with force canceling blade configuration |
| US10344742B2 (en) | 2015-04-23 | 2019-07-09 | Continuum Dynamics, Inc. | Hybrid vertical/horizontal axis wind turbine for deep-water offshore installations |
| US10598156B2 (en) | 2015-04-23 | 2020-03-24 | Continuum Dynamics, Inc. | Hybrid vertical/horizontal axis wind turbine for deep-water offshore installations |
| US10626848B2 (en) | 2015-04-23 | 2020-04-21 | Continuum Dynamics, Inc. | Lift-driven wind turbine with force canceling blade configuration |
| US10837426B2 (en) | 2015-04-23 | 2020-11-17 | Continuum Dynamics, Inc. | Hybrid vertical/horizontal axis wind turbine for deep-water offshore installations |
| US10927817B1 (en) | 2015-04-23 | 2021-02-23 | Continuum Dynamics, Inc. | Hybrid vertical/horizontal axis wind turbine for deep-water offshore installations |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |