Hi Jim, Greetings from Italy ! You did a very professional study and a very good realization. Please, go ahead with the development of the project and we will follow you. Alessandro
Thanks am new subscriber am looking to make a wind wall / fence across my front yard I love this idea will be easy to get fabric from used clothing from thrift shop and 0ld oil buckets for disc . Lots of small turbines with colorful sails each turning a small generator.
Greetings from Turkey, you are very professional, congratulations. Please keep improving this project and try how many w of energy we can generate with Alternator
Great for underdevelopment countries and wilderness places. I plan making one to wash clothes. In WWII the young soldiers in Kwajalein built a wind turbine to wash their clothes.
Great improvement over the previous! On the area and available power, If I were faced with a choose between doubling the radius or doubling the height, both having the same area and presumptivly the same power, I'd choose double the height because asuming the same tip speed ratio, a smaller radius spins faster in a given wind than doubling the radius with the same tip speed in the same wind.
Unfortunately only one side i.e..50% the frontal area catches the wind! I'de use twin counter rotating geared together sails & drums in the same overall square ftg area. Use high quality bearings w continuous lubrication or stabilized magnetic bearings.
Brilliant. I've watched many other DIY wind turbine projects, but this by many factors is the easiest, the one that has me excited to start building and trying out. Thank you.
Hi , Can you tell me have you tested any of these designs with load? It is because I have heard that lift type are best VAWT and especially helical design that self starts.
I have not yet tested under load. I am working on a non-electric method to generate heat within a building that is near the VAWT. This will be the load for the turbine. Thanks for your comment.
How is it with the Coanda effects? Its always right to simpliphy if it is better! Now I just don't see it! The Sail take more stress, and the better speed, I did not see it! What I see is less torque in same speed! Its not a bad idea just not better!
Thank you very much indeed. Everthing is clear as sky. What would be if the number of sails are decreased or increased? How important is a width of the sail? A relation of the sail sides, how longer should be longer side? How about combination of drag type with lift type VAWT? They say that the drag type is efficent at a lower wind velocity and the lift type efficient at higher velocity? Are these upper and lower discs are mandatory or could they be replaced by plastic or metal bars from the center? Thank you again.
Awesome concept! I have a question for Jim: would it help to design it with an odd number of sails so that the windward sails don't block the wind from the leeward sails? What ratio of leading edge to trailing edge length did you use for this prototype?
An odd number might help; the amount of gap between the sails may be just as important. As I mentioned in the video, the trailing edge was much too long. The flopping of the sails could be greatly reduced by making the trailing edge only slightly longer than the leading edge. Thanks for your comment.
In general the answer is " as high as you can afford" When looking at open terrain winds, the speed increases with height. The VAWT can be used to utilize wind that is concentrated by objects like buildings and solid fences. In that case the VAWT should be mounted high enough that it is not a danger to people walking below it.
Hopefully we can all learn together. Please let us know about your activity and experiences. Consider making a video of your results. Thanks for your comment.
Very inspiring video and I am eager to see the your following vawt. Just a quick question: what is the ratio of the long and short sides of the trapezoid sails?
The long side was 18 inches, the short side was 13 inches, the width was 6 inches. I would shorten the long side to get a better airfoil shape. Thankyou for your comment.
@@Jimscoolstuff Thank you for your reply and I will then try a bit shorter long side. Presently the picture in my mind of a vawt consists of L-shaped sail holders (both top and bottom) perhaps welded to the axle. (Then the sails would be tangential, and at higher rpm they probably would bend the tip of L-shaped rod toward each other, do not know yet.) I think trying to eliminate the C-sub-2 is a brilliant idea of yours, thank you for sharing with us. I am looking forward to your further modifications!
drum cylinder, no sails, flaps, no cups, just flat bending flexible wings-blades, its like a drum-cylinder with long wires, wrapped around the drum, like coils, but flat sheet blades, simplest ever, just the attachment point to the cylinder-drum
it could be a wire spool or flat cylinder, both work, the wire spool top-bottom could have the cup effect stoppers to a certain angle adding the pelton cup effect, 0% against the wind, 100% (90 degrees) along the wind, cyclocopter turbine, but passively opened-collapsed
enhanced lift-cylinder turbine, enhanced magnus effect turbine, with the flat sheets opening, without the cups, just describing the turbine, toilet paper roll with the flexible sheets
betz is only for special set of assumptions, assume you have a small area spread to infinite area, as air hydraulics, you get approaching zero wind speed out, it functions like a bell nozzle, or reverse constriction speed-up nozzle, ie, speed-down hydraulic nozzle
What a sad and negative person! You're downright disrespectful and arrogant. I won't be surprised if you work for "Big Energy" and would rather this knowledge be available to only a "few" people.
I love that mind, excelent. Some days big ships will harvest energy from wind and water currents to charge gargantuan advanced batteries for sell later or produce hydrogen for large ocean liners.
![เปิดบ้าน พี่ตูน Bodyslam หลังใหม่คนแรก ที่ภูเก็ต l [Nickynachat]](http://i.ytimg.com/vi/flFwcmyDQSk/mqdefault.jpg)
Hi Jim, Greetings from Italy !
You did a very professional study and a very good realization.
Please, go ahead with the development of the project and we will follow you.
Alessandro
Thank you for your comment.
Another cracker Jim, well done. Keep it going. I'm addicted
Nice, I'd love to see it in action and find out it's torque and rpms in different wind speeds
Thank you for this wonderful video. My appreciation and respect to you
Thanks for your nice comment and best regards.
Keep up the good work, I liked the concept of self starting VAWT. Your viewers would love to see a prototype.
Thank you for your comment. I continue to work and will make another video as soon as I have something to show.
Genial (spanish), wonderful (english), macanudo ( bolivian spanish)
I like the CD layers with the flexible flaps turbine. Shown on Robert Murray-Smiths channel.
Thanks am new subscriber am looking to make a wind wall / fence across my front yard I love this idea will be easy to get fabric from used clothing from thrift shop and 0ld oil buckets for disc . Lots of small turbines with colorful sails each turning a small generator.
Thank you for your comment, and thanks for subscribing.
A great idea indeed. A work of genius mind.
Please make a video on Archimedes wind turbine, how to make at bome
Greetings from Turkey, you are very professional, congratulations. Please keep improving this project and try how many w of energy we can generate with Alternator
Great for underdevelopment countries and wilderness places. I plan making one to wash clothes. In WWII the young soldiers in Kwajalein built a wind turbine to wash their clothes.
Thank you for your comment.
Great improvement over the previous! On the area and available power, If I were faced with a choose between doubling the radius or doubling the height, both having the same area and presumptivly the same power, I'd choose double the height because asuming the same tip speed ratio, a smaller radius spins faster in a given wind than doubling the radius with the same tip speed in the same wind.
Unfortunately only one side i.e..50% the frontal area catches the wind! I'de use twin counter rotating geared together sails & drums in the same overall square ftg area. Use high quality bearings w continuous lubrication or stabilized magnetic bearings.
Thanks for your suggestions.
Super.
Thanks.
Amazing video, great renewable energy concept.
Thank you for your comment.
Brilliant. I've watched many other DIY wind turbine projects, but this by many factors is the easiest, the one that has me excited to start building and trying out. Thank you.
Hi , Can you tell me have you tested any of these designs with load? It is because I have heard that lift type are best VAWT and especially helical design that self starts.
I have not yet tested under load. I am working on a non-electric method to generate heat within a building that is near the VAWT. This will be the load for the turbine. Thanks for your comment.
How is it with the Coanda effects? Its always right to simpliphy if it is better! Now I just don't see it! The Sail take more stress, and the better speed, I did not see it! What I see is less torque in same speed! Its not a bad idea just not better!
Amazing. You're right, I immediately want to build one
Jim pls show step by step in detail, how do we fix the centre rod, do we use a bearing
Thank you very much indeed. Everthing is clear as sky. What would be if the number of sails are decreased or increased? How important is a width of the sail? A relation of the sail sides, how longer should be longer side? How about combination of drag type with lift type VAWT? They say that the drag type is efficent at a lower wind velocity and the lift type efficient at higher velocity? Are these upper and lower discs are mandatory or could they be replaced by plastic or metal bars from the center? Thank you again.
Thank you for your comment. I am planning to investigate some of the things that you mentioned. I hope to publish another video soon.
Best Regards
This is wonderful, with no jargon-science and simply illustrated, great work, keep it up Dr. Jim
Thank you for your kind words.
Awesome concept! I have a question for Jim: would it help to design it with an odd number of sails so that the windward sails don't block the wind from the leeward sails? What ratio of leading edge to trailing edge length did you use for this prototype?
An odd number might help; the amount of gap between the sails may be just as important.
As I mentioned in the video, the trailing edge was much too long. The flopping of the sails could be greatly reduced by making the trailing edge only slightly longer than the leading edge. Thanks for your comment.
Hello Can i ask how can i get the mounting height of the VAWT using wind speed of the specific location?.
In general the answer is " as high as you can afford" When looking at open terrain winds, the speed increases with height. The VAWT can be used to utilize wind that is concentrated by objects like buildings and solid fences. In that case the VAWT should be mounted high enough that it is not a danger to people walking below it.
I love the toys you make and get to play with! You continue to blow me away with your vids. Good stuff man!
All good scientists are actually playing with toys. Thanks for your nice comment.
That mesh between concepts you've melded there is very neat indeed.
Thanks for your nice comment.
Great Video! nice work. I will be making one of these
Hopefully we can all learn together. Please let us know about your activity and experiences. Consider making a video of your results. Thanks for your comment.
Very inspiring video and I am eager to see the your following vawt. Just a quick question: what is the ratio of the long and short sides of the trapezoid sails?
The long side was 18 inches, the short side was 13 inches, the width was 6 inches. I would shorten the long side to get a better airfoil shape. Thankyou for your comment.
@@Jimscoolstuff Thank you for your reply and I will then try a bit shorter long side. Presently the picture in my mind of a vawt consists of L-shaped sail holders (both top and bottom) perhaps welded to the axle. (Then the sails would be tangential, and at higher rpm they probably would bend the tip of L-shaped rod toward each other, do not know yet.)
I think trying to eliminate the C-sub-2 is a brilliant idea of yours, thank you for sharing with us. I am looking forward to your further modifications!
👍🙂
Thanks for your encouragement.
So awesome
Keep up the great work! Very interesting!
Thanks for your encouragement. Best regards.
Mis felicitaciones. Eres realmente un genio
Thank you for your kind words. Best regards
gracias por tus amables palabras y un saludo
So P= AV^3 /2.
Fascinating idea!
Thank you for your comment.
This is amazing. I can't wait for part 3. I do want to build one myself.
Please keep us informed with photos or a video.
drum cylinder, no sails, flaps, no cups, just flat bending flexible wings-blades, its like a drum-cylinder with long wires, wrapped around the drum, like coils, but flat sheet blades, simplest ever, just the attachment point to the cylinder-drum
it could be a wire spool or flat cylinder, both work, the wire spool top-bottom could have the cup effect stoppers to a certain angle adding the pelton cup effect, 0% against the wind, 100% (90 degrees) along the wind, cyclocopter turbine, but passively opened-collapsed
enhanced lift-cylinder turbine, enhanced magnus effect turbine, with the flat sheets opening, without the cups, just describing the turbine, toilet paper roll with the flexible sheets
I dont respect the betz limit, try center-in radial-out centrifugal turbine, check the math
betz is only for special set of assumptions, assume you have a small area spread to infinite area, as air hydraulics, you get approaching zero wind speed out, it functions like a bell nozzle, or reverse constriction speed-up nozzle, ie, speed-down hydraulic nozzle
use a drum, or a wire spool shape, to attach the turbo fins or longer wind blades
I watched your first video in the series earlier today, then found this one. Appreciate your experimentation and videos thereof - thanks for sharing!
Thanks for your comments. Best Regards
Very clumsy design with cloth flying around
Yes you are correct. It is more of a proof of concept than a design. Thanks for your comment.
Your comment is very arrogant, you are a very disrespectful person, the video is successful
What a sad and negative person! You're downright disrespectful and arrogant. I won't be surprised if you work for "Big Energy" and would rather this knowledge be available to only a "few" people.
I love that mind, excelent. Some days big ships will harvest energy from wind and water currents to charge gargantuan advanced batteries for sell later or produce hydrogen for large ocean liners.