@@1islam1 Overall not a bad sale, but calling it 'He' goes against ' God is nothing like a human being or like anything that we can imagine'. Hence why woman are second class chattel's within this religion. It's patriarchal by the design of 'a human', playing as the 'word of God'. Its more pure to stop 'following' the middle men who want to 'clip the ticket' to the spiritual and Creation we all have within our hearts, whether we act up on it or not, outside those close to us, and instead BE as someone like Jesus would in the world. 'Humans' have vested interests in having followers believe otherwise. Power.
@@1islam1 I believe in God, but not in Religions, whatever they are named. However, this comment is off-topic, and you should not post a comment without relation to the subject. Your post also puts the Islam in the wrong light - One can get the impression of a radical belief that tries to convince others of being the only truth.
I think you might get easier rotation and more energy by putting four 120 degree rotors on it, spaced 90 degrees apart. Also, possibly extend the shaft so the motor (and your hand, or any mounting point) is below the rotor to see if you get more energy by the wind not being blocked in the middle. You could also combine both ideas and see if there's any difference or improvement in the power generation.
This is one of my favorite channels on RU-vid, definitely watching every video. Thank you for taking your time to share all this knowledge with us. You're awesome.
The reason the Ugrinsky turbine is more sensitive to the wind than the Darieus and is more efficient than the Savonius is that its profile exploits both lift and drag at the same time.
I really like the modularity of the super generator with different blade system so you can experiment a lot. That's a great idea, a common interface for different blade systems.
When things don't at first work as expected, just give it a little shake or a hammer where needed. LOL! Thanks for the video Rob. So this is what they call a "hands on" type job. Keep up the good work Rob. Thanks again.
@@nickbrockelman It was a joke from me. It is self starting, he shook it to free up the electric motor that it was attached to not because it would not self start. A motor when it sits for a while gets into a bind and takes more force to start it moving than usual it would need. If this indeed had been on a low friction bearing it would have started turning on its own. That is what he means by calling it self starting.
add a 60 degree draft cone half the height to the top and bottom to compress and increase the velocity directly to the foils. Great Channel and Thanks for so many wonderful and inquisitive Ideas
I think the best one was, the one where the blades lifted on the windward side , and closed on the other reducing drag. Brilliant idea , probably one of the best you've created my friend. You are a bloody genius , I wish companies would take your ideas , instead of those huge , useless , ones they insist on installing at present ,
The ratio between lift and drag is the "lift to drag ratio". Reynolds number is "the ratio between inertial and viscous forces". It effects how a fluid flows (air/water) behave at different speeds and size/scale. Airplane wings fly best at high speeds (100 mph+) and with wings wider than 3 feet. The narrow airfoils and slower speeds of small lift type wind turbines make them preform terribly compared to large wind turbines with 50 foot+ blades. There are airfoiltools online that graph the change performance of many different airfoils when operating at different Reynolds numbers. There are also online calculators for determining the Reynolds numbers.
@@justtinkering6713 No - not his style - a new video per day is the priority. Anyone that cares about the subject will do more investigation on their own. He is right that the turbine will operate at a low Reynolds number, however airfoil shapes perform worse the lower number.
@@justtinkering6713 Happy independence day! The video is no longer up and the VAWT is in the shop waiting for an improved rotor. Still a lot of testing to do on my rotor designs. Hope to have it back in the pond this winter.
Aaaaaah! The joyous laughter that follows the "IT'S ALIVE!" moment! It is so contagious, I cant help but giggle along with you! I greatly admire your works, as well your Tesla attitude towards all your discoveries, THANK YOU!
Looking quite dapper there Prof. You need to print a still frame of the shot of you holding the turbine (laughing) with the clouds as backdrop, to hang in the workshop, it encapsulates the essence of your inimitable work.
1:05, the Reynolds is a measure of turbulence (specifically the ratio of viscous to inertial forces), the balance between drag and lift is called the lift to drag ratio
Don’t forget one thing! The maximum energy to be extracted from the wind, will alway depends on the frontal area exposed to the wind! Actual designs are close to 50% efficiency, which is supposed to be the calculated theoretical limit. Besides this,me ven if the concept is super efficient, a small unit will alway provide small power.
seems that if you had the simpler design of two half barrels that almost join at the center, it would have started spinning much sooner with all that wind. make 5 turbines. set up a a couple of magnets on each for resistance that needs to be overcome (imitates a generator), and get a tachometer on each turbine. see when each starts spinning and how fast each spins. that'll get you ballpark into best design, things happening on the same day, same conditions, etc. tachometer can probably be made from a simple light module, a spot of reflective tape, and an arduino, which will log the results into a nice file for you, so you can compare columned data sets.
"In any system of energy, Control is what consumes energy the most. Time taken in stocking energy to build an energy system, adding to it the time taken in building the system will always be longer than the entire useful lifetime of the system. No energy store holds enough energy to extract an amount of energy equal to the total energy it stores. No system of energy can deliver sum useful energy in excess of the total energy put into constructing it. This universal truth applies to all systems. Energy, like time, flows from past to future"(2017).
Darrieus types work better when over a metre in diameter as the rate of change of pitch is slower. Also the amount of blade blocking the through flow (i.e. number of blades and their length) significantly affects performance, so 2 blades are better than 3 or more.
Look at the twigs of the bushes waving up and down before it starts. Like they’re reaching out to give it a nudge. Would it be feasible to have something like that to nudge-start it in lower wind conditions? Something that would give it a push, flop over in higher wind. And only slowly pop back up once the wind drops again…?
Interesting placement of the motor, and a nice optical illusion with that spin too! What if the blades weren't based on a calendar, but on a cone instead?
Would be nice to know the watts from the generator with each system in different wind conditions but I love the way you are showing them in different wind conditions.
Ducted vertical turbines seem to be the way to go for me. They work regardless of wind direction and accelerate any wind to use it most efficiently. By degrees they cannot overspeed if correctly designed.
I believe that this would gain from opening up the top of the bades, where the blade meets the disk at the top, the bottom can remain the same... It prevents airflow... It would send air away from the direction of the turn... I see it as air rivers flowing on the blades and there is a dam at the top preventing flow and accelleration... Remove the dam at the top please. I would love to see the results, even in slower wind it might help. I understand lift as well.. I studied in aeronautics.
You need to add a camera tripod mount or something to the bottom so you don't have to hold it up perhaps. If you find a tripod with a hook on the bottom you can use a carrier bag with a bottle of water in it as the weight on the bottom to hold it in place when it is windy.
Of course unloaded is easier to get started than having a load on it. Might be neat to have a device added that checks for a minimum RPM before putting a load on the generator part so it can start with even less stalling issues.
Wrong explanation about lift, partly. But the design looks legit, and nice fancy. I can imagine though that it works much better without a large generator and a hand in the middle. The air needs to flow through freely, I think.
Just a thought - if you shield the resistive side of the wheel (right side in this case) would the resistance to starting (and rotation) be reduced (if not eliminated)? Just love seeing you do what I can not - theory is fun, but not as much fun as doing the practical testing.
The generator should have no load until it is spinning fast enough to produce a voltage that will charge your battery, or power electronics, or whatever. Until energy is 'allowed' out of the generator it just accumulates with little resistence in the speed and weight of the turbine, like a flywheel. Only 'allowing' current out of the generator limits the speed, or extreme noise and vibration if the generators circuit is never closed by charging or a dump load. The system is designed to only allow current to flow at an optimal speed/voltage level.
@@adymode Honestly, I think this design isn't working to convert the energy of the wind well enough. It was very slow to get started and that means that it has very poor torque. It doesn't matter how fast it gets if the torque is poor, as soon as a load is placed on the generator, it will slow down too much and stall.
@@marcfruchtman9473 Very limited success. On a breezy day with no load it should be expected to really hum after a few seconds of turning. From past experience - it could hum so much Id not want to hold it. Im waiting for that video where Robert discovers how energetic unrestrained wind catchers can get X) I suspect it twists through too great an angle spoiling the aerodynamics of the cross section. Just 5 or 10 degrees may provide the required kick while having little impact on the airfoils performance.
I assume you'd want to use some sort of a bearing that's suitable for handling the side loads, rather than having your generator shaft handle those loads? And then connect your generator to the shaft using a gear that can allow for some movement between the shaft and the bearing?
I'm wondering fi you cut out some holes in the large circles if it would move faster? Air is traveling along the blade and how it exits the top should make some small difference on a short system. Over a long/tall Collum it would make a lower percentage of difference.
If you stand in a windy spot like that your own body can cause enough turbulence to start the thing. Stay there for a millennium and you might recoup the energy used by the 3D printer.
How about bearing under the whole new turbine? Not in the center axis ! And the generator at the outer edge of the bottom plate. The diameter of the turbine could be several meters.
Suggestion: Get hold of an ESP32, set it up as an AP, program it so that it is a WebPage. Use a small 3.7Volt rechargeable battery make a circuit to monitor the motor's output (Volts/AMPS/Speed). You can incorporate the circuit into your round base under the motor, a redesign of that cover of course. You will then be able to display the data on your phone or computer to be displayed for all to see. As for the unstopping design issue that was mentioned, why not have the ESP32 monitor the rotation speed and induce a load proportionate to the speed of the unit to slow it down, if necessary or send an ALERT. Have to keep improving these things. Just a thought. Great video!!!
I could be wrong, but it seems like the top plate needs cutouts so it looks more like spokes than a plate. I get the feeling air piles up near the top.
The solid top disc blocks wind from flowing from top to bottom along the helix. If that happened it would start turning in the opposite direction. In turbulent wind it's just a matter of time until some air moves bottom to top to start the spin.
looks good but in fact that the trees in the background are moving around like crazy but this thing is not spinning well means its not working as expected?
Is the generator preventing flow-through? Would it work better if the central portion was clear so that the flow-through wind would also work on the blade on the far side?
Why make it a helix? Efficiency of material? If not, why not just make the VAWT fan blades shaped like a fairly undercambered wing profile so each blade gets both the push and lift? Lift will go in the same direction as push when air hits the front of the blade and as the axis turns. This might allow for more torque in gear ratios if not speed, but it should increase speed.
Now the Lenz II, a Hybrid how start in low Wind and work with an extra torque!! Easy and cheap to build! All on open source! Rob. What you show is great! But to build a VAWT to manage a energy-crises it might work! But I feel it a bit to Cheap and might be a good start! /Mikael PS. Why i feel so much for this 30 £ VAWT? The Lenz II is an airplane wing in profile, we got millions of years from nature in lower develop-cost if we modify it, and the mankind have tested this in over 100 Years! Is this critic for Robs work not a minute is just to show an alternative and what Rob do is an extremely low cost lift us up from seeker to producer, to be an Inventor you need to understand why this is so fun. And Roberts nature show us Years of developed of mankind He is just a great You-tuber and schooled Inventor and show us a way to have a great time!!! DS.
Two questions. What was the wind speed when it started to turn, and could a car alternator be used, or would the turbine be too slow to get effective power?
Can I please ask how you came to deciding on the 120° angle for the blades and.....can I ask what is the minimum wind speed needed to start turning the turbine?
