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 / Swept area	information not available
Power	information not available
Dimensions	information not available
Components
Rotor	8 blades
Transmission	information not available Belts and pulleys
Generator	information not available 2 units
Machine frame	information not available Mobile structure
Mast	information not available
Brake	information not available
Safety shutdown	information not available
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
	Evaluator2:	xtech: It appears to be a professional design, I would recommend a protective cover for the transmission and electrical system. Also the necessary signage as it is noted that its use is at ground level, where there may be foot traffic.	3
	Evaluator3:
Durability	Evaluator1:	thehunter: All components seem to be made of stainless steel. The structure seems adequately sized.	3
	Evaluator2:	xtech: The selected components are durable.	3
	Evaluator3:
Investment cost	Evaluator1:	thehunter: I assume that because of the use of stainless steel the manufacturing cost is quite high.	2
	Evaluator2:	xtech: The materials and industrial processes observed will increase the total amount of the investment	2
	Evaluator3:
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
	Evaluator2:	xtech: Depending on the locality, there may be cases where stainless steel sheets may be difficult to locate.	2
	Evaluator3:
Manufacturing processes / Manufacturing quality	Evaluator1:	thehunter: The constructor of thi sproject needs to have experience in working with stainless steel.	2
	Evaluator2:	xtech: Certain equipment such as sheet benders is required, product quality is very good	2
	Evaluator3:
Suitable for reverse engineering	Evaluator1:
	Evaluator2:	xtech: Yes, only some reference data is required but the images seem adequate	3
	Evaluator3:
Others	Evaluator1:	thehunter: Apparently it is a very professional and sophisticated design, but also quite expensive due to the materials used.
	Evaluator2:	xtech: Ground level use reduces wind speed utilization	2
	Evaluator3:
Recommendations	Evaluator1:	thehunter: Consider whether stainless steel really has to be used everywhere.	-
	Evaluator2:	xtech: -	-
	Evaluator3:		-
Total score Evaluator1:			13
Total score Evaluator2:			17
Total score Evaluator3:

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 / Swept area	1 m²
Power	200 Watt max
Dimensions	height: 1 m, diameter: 1 m
Components
Rotor	3 blades
Transmission	information not available Belts and pulleys
Generator	was an 80 volt permanent magnet DC motor
Machine frame	information not available Mobile structure
Mast	information not available
Brake	information not available
Safety shutdown	information not available
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
	Evaluator2:	xtech: I suggest a support frame so as not to depend structurally only on the axis of rotation cantilevered.	2
	Evaluator3:
Durabilityist	Evaluator1:	thehunter: The materials used seem to be okay for outdoor use.	3
	Evaluator2:	xtech: Appears to be a durable design	3
	Evaluator3:
Investment cost	Evaluator1:	thehunter: Iseems to be a relatively inexpensive construction.	3
	Evaluator2:	xtech: Excellent design simplification and consequent investment reduction	3
	Evaluator3:
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
	Evaluator2:	xtech: They are accessible materials, the metallic sheet appears to be made of galvanized steel.	3
	Evaluator3:
Manufacturing processes / Manufacturing quality	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
	Evaluator2:	xtech: Feasible for a DIY type process	3
	Evaluator3:
Suitable for reverse engineering	Evaluator1:
	Evaluator2:	xtech: With the general measurements indicated and some references for the internal components, it is possible to apply reverse engineering.	3
	Evaluator3:
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
	Evaluator2:	xtech: -	3
	Evaluator3:
Recommendations	Evaluator1:	thehunter:	-
	Evaluator2:	xtech: Include some electrical protection system	-
	Evaluator3:		-
Total score Evaluator1:			17
Total score Evaluator2:			20
Total score Evaluator3:

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 / Swept area	1.95 m² (estimated)
Power	information not available
Dimensions	information not available
Components
Rotor	4 blades
Transmission	information not available crank-rod system
Pump	Piston water pump
Machine frame	information not available
Mast	information not available
Brake	information not available
Safety shutdown	information not available
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
	Evaluator2:	xtech: The structure appears to be stable but the profiles used could fail under unforeseen loads or fatigue, creating a risk to people.	2
	Evaluator3:
Durabilityist	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
	Evaluator2:	xtech: Metal parts should have a corrosion protection, it is also good to know the characteristics of the pump used to evaluate durability.	2
	Evaluator3:
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
	Evaluator2:	xtech: Apparently the materials are mostly recycled, this greatly reduces the investment	3
	Evaluator3:
Supply of materials, standard and purchased components	Evaluator1:	thehunter: All materials and components seem to be readily available.	3
	Evaluator2:	xtech: The materials are very easy to acquire	3
	Evaluator3:
Manufacturing processes / Manufacturing quality	Evaluator1:	thehunter: No special Manufacturing processes are used.	3
	Evaluator2:	xtech: The manufacturing processes are DIY or handmade, the product quality could be improved.	2
	Evaluator3:
Suitable for reverse engineering	Evaluator1:
	Evaluator2:	xtech: Reverse engineering is feasible	3
	Evaluator3:
Others	Evaluator1:	thehunter:
	Evaluator2:	xtech: The stroke of the long bar and the frequency of its movement must be defined, as this affects the selection of the pump if it is purchased.	2
	Evaluator3:
Recommendations	Evaluator1:	thehunter: buy some weatherproof metal paint for the halved trash barrels, and the project looks much better right away	-
	Evaluator2:	xtech: It is a project made for ornamental purposes, adjustments can be made to develop it for water supply purposes, this could include a reserve tank above	-
	Evaluator3:		-
Total score Evaluator1:			13
Total score Evaluator2:			17
Total score Evaluator3:

Summary

	Project 1	Project 2	Project 3
Title	How To Build mobile Savonius - Rotor eolienne	Savonius - rotor self-made	Savonius Rotor (Homemade) - Water Pump Application
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
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
Use	Electricity generation	Electricity generation	Water Pumping
Swept area	-	1 m²	~1.95 m²
Manufacturing quality	Ok	Ok	Regular
Recomendations	Evaluate use of stainless steel or other material	Include electrical protection system	Use coating on barrels, formulate project for water supply
Total score	15	18.5	15