Selected Savonius wind turbines

Objectives

• Collect information from projects related to Savonius rotor.
• Present the projects with the most important information.
• Evaluate strengths and weaknesses of each project.

Project 1 - How To Build mobile Savonius - Rotor eolienne

Project data
Url original	https://www.youtube.com/watch?v=L3HDEkuIDYc
Url on OHO	https://en.oho.wiki/wiki/How_To_Build_mobile_Savonius_-_Rotor_eolienne_2
Images
Technical data
Category	Renewable energies > Wind turbines > Savonius wind turbines
Subclass	VA – vertical axis frame
Use	Electricity generation
Rotor	N-E
Power	N-E
Dimensions	N-E
Components
Rotor	8 blades
Transmission	N-E Belts and pulleys
Generator	N-E 2 units
Machine frame	N-E Mobile structure
Mast	N-E
Brake	N-E
Safety shutdown	N-E
Other components	Rear suspension, tension cables, trailer anchor, board and electrical wiring
YouTube data
Visits / likes / don't likes	8180 / 42 / 2
Uploaded date	12.10.2014
Important comments	-

Evaluation
Score Legend: 1-> Deficient, 2-> Regular, 3-> Ok
Property	Evaluator	Comments	Score
Operational safety	Evaluator1:	thehunter: In the video it is not possible to see if there is an automatic shutdown in case of strong wind. Possibly via the generators. It is a very professional construction, so I assume that there is an automatic shutdown. The construction looks very stable. The additional lashings with wire ropes give additional use stiffness.	3
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Durabilityist	Evaluator1:	thehunter: All components seem to be made of stainless steel. The structure seems adequately sized.	3
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Investment cost	Evaluator1:	thehunter: I assume that because of the use of stainless steel the manufacturing cost is quite high.	2
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Supply of materials, standard and purchased components	Evaluator1:	thehunter: The purchased parts, i.e. electrics, alternator, pulleys, V-belts et cetera seem to be commercially available components.	3
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Manufacturing processes	Evaluator1:	thehunter: The constructor of thi sproject needs to have experience in working with stainless steel.	2
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Others	Evaluator1:	thehunter: Apparently it is a very professional and sophisticated design, but also quite expensive due to the materials used.
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Recommendations	Evaluator1:	thehunter: Consider whether stainless steel really has to be used everywhere.	-
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Total score Evaluator1:
Total score Evaluato 2:
Total score Evaluator2:

Project 2 - Savonius - rotor self-made

Project data
Url original	https://www.youtube.com/watch?v=rt1aRkNBBtE
Url on OHO	https://en.oho.wiki/wiki/Savonius_-_rotor_self-made
Images
Technical data
Category	Renewable energies > Wind turbines > Savonius wind turbines
Subclass	VA – vertical axis frame
Use	Electricity generation
Rotor	diameter: 1 m
Power	200 Watt max
Dimensions	height: 1 m
Components
Rotor	3 blades
Transmission	N-E Belts and pulleys
Generator	was an 80 volt permanent magnet DC motor
Machine frame	N-E Mobile structure
Mast	N-E
Brake	N-E
Safety shutdown	N-E
Other components	Legs, shaft, bearings
YouTube data
Visits / likes / don't likes	142.377 / 61 / 5
Uploaded date	17.02.2008
Important comments	A hub motor from an e-bike would work better because you don't have to translate it so much. The powered generator stores its energy in lead gel batteries and is then used for lighting etc when needed. It is particularly storm-proof and very suitable for weak winds

Evaluation
Score Legend: 1-> Deficient, 2-> Regular, 3-> Ok
Property	Evaluator	Comments	Score
Operational safety	Evaluator1:	thehunter: The developer says that the project survived one of the strongest storms ever in Germany without damage.	3
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Durability	Evaluator1:	thehunter: The materials used seem to be okay for outdoor use.	3
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Investment cost	Evaluator1:	thehunter: Iseems to be a relatively inexpensive construction.	3
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Supply of materials, standard and purchased components	Evaluator1:	thehunter: Only materials or components that are easy to preserve seem to have been used here.	3
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Manufacturing processes	Evaluator1:	thehunter: It is not clear how the sheets of the rotor blades were joined. But otherwise, no expensive or sophisticated manufacturing processes seem to have been used.	3
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Others	Evaluator1:	thehunter: The vertical axis is attached directly to the roof structure of the house with two ball bearings. This is energetically unfavorable, because the roof creates strong turbulence in the air flow, which significantly reduces energy efficiency.to solve this problem would have to design and build a completely new rack, preferably with a height of several meters. If someone wants to mount a Savonius rotor directly on his peaked roof, then this is certainly a good solution.	2
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Recommendations	Evaluator1:	thehunter:	-
	Evaluator2:		-
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Total score:

Project 3 - Savonius Rotor (Homemade) - Water Pump Application

Project data
Url original	https://www.youtube.com/watch?v=_G4wcEOAtFA https://www.youtube.com/watch?v=QU046KNtpLE
Url on OHO	https://en.oho.wiki/wiki/Savonius_Rotor_(Homemade)_-_Water_Pump_Application_-_Part_1_-_Feng_Shui
Images
Technical data
Category	Renewable energies > Wind turbines > Savonius wind turbines
Subclass	VA – vertical axis frame
Use	Pumping water
Rotor	N-E
Power	N-E
Dimensions	N-E
Components
Rotor	4 blades
Transmission	N-E crank-rod system
Pump	Piston water pump
Machine frame	N-E
Mast	N-E
Brake	N-E
Safety shutdown	N-E
Other components	Tension cables, long piston rod
YouTube data
Visits / likes / don't likes	5880 / 24 / 0 (2 videos)
Uploaded date	17.04.2013
Important comments	homemade construction, with recycled materials.

Evaluation
Score Legend: 1-> Deficient, 2-> Regular, 3-> Ok
Property	Evaluator	Comments	Score
Operational safety	Evaluator1:	thehunter: It is not clear from the video whether the construction also provides sufficient safety in high winds or during storms. The construction seems to be made of galvanized steel pipe and, which at first glance seem a bit thin, but this can be deceiving.	2
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Durability	Evaluator1:	thehunter: by using cut out 200 l tin barrels the construction looks a bit unprofessional. However, the tin drums have good stability and insensitivity to corrosion, if properly treated. Galvanized steel pipes is quite suitable as a material for the construction. The craftsmanship is not very clean, but that does not matter for the assessment.	2
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Investment cost	Evaluator1:	thehunter: This is clearly a very low cost design, it is probably not possible to build a Savonius wind turbine much cheaper.	3
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Supply of materials, standard and purchased components	Evaluator1:	thehunter: All materials and components seem to be readily available.	3
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Manufacturing processes	Evaluator1:	thehunter: No special manufacturing processes are used.	3
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Others	Evaluator1:	thehunter:
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Recommendations	Evaluator1:	thehunter: buy some weatherproof metal paint for the halved trash barrels, and the project looks much better right away	-
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	Evaluator3:		-
Total score:

Project 4 - Savonius rotor self-made (in use)

Project data
Url original	https://www.youtube.com/watch?v=3NCPkuCk1Ts
Url on OHO	https://en.oho.wiki/wiki/Savonius_rotor_self-made_(in_use)
Images
Technical data
Category	Renewable energies > Wind turbines > Savonius wind turbines
Subclass	VA – vertical axis frame
Use	Electricity generation
Rotor	N-E
Power	N-E 4 super bright, white LEDs are operated
Dimensions	N-E
Components
Rotor	2 blades - small scale
Transmission	N-E
Generator	N-E
Machine frame	N-E
Mast	N-E
Brake	N-E
Safety shutdown	N-E
Other components	current limiting module (3.5 volts / 120 mA) connected upstream
YouTube data
Visits / likes / don't likes	40.338 / 45 / 5 (2 videos)
Uploaded date	21.05.2009
Important comments	Small speeds or low wind speeds are completely sufficient

Evaluation
Score Legend: 1-> Deficient, 2-> Regular, 3-> Ok
Property	Evaluator	Comments	Score
Operational safety	Evaluator1:
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Durability	Evaluator1:
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Investment cost	Evaluator1:
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Supply of materials, standard and purchased components	Evaluator1:
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Manufacturing processes	Evaluator1:
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Others	Evaluator1:
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Recommendations	Evaluator1:		-
	Evaluator2:		-
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Total score:

Summary

	Project 1	Project 2	Project 3	Project 4
Title	How To Build mobile Savonius - Rotor eolienne	Savonius - rotor self-made	Savonius Rotor (Homemade) - Water Pump Application	Savonius rotor self-made (in use)
Url	https://www.youtube.com/watch?v=L3HDEkuIDYc	https://www.youtube.com/watch?v=rt1aRkNBBtE	https://www.youtube.com/watch?v=_G4wcEOAtFA https://www.youtube.com/watch?v=QU046KNtpLE	https://www.youtube.com/watch?v=3NCPkuCk1Ts
OHO url	https://en.oho.wiki/wiki/How_To_Build_mobile_Savonius_-_Rotor_eolienne_2	https://en.oho.wiki/wiki/Savonius_-_rotor_self-made	https://en.oho.wiki/wiki/Savonius_Rotor_(Homemade)_-_Water_Pump_Application_-_Part_1_-_Feng_Shui	https://en.oho.wiki/wiki/Savonius_rotor_self-made_(in_use)
Use	Electricity generation	Electricity generation	Water Pumping	Electricity generation
Recomendations	-	-	-	-
Total score	-	-	-	-