A 100kW wind generator in only 7sqm? Less than 2% the size of traditional wind turbines!
Basic physics and the whiteboard to the rescue!
A look at the claims of the AmericanWind WindWall "turbine" wind power generator.
http://americanwindinc.com/our-products-3/advanced-windwall/
And a Wind Power 101 tutorial on how wind turbine calculations work and pesky limitation of Betz's law.
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The Patent: https://patents.google.com/patent/US9331534B2/en
Failed ducted wind turbine projects: http://www.wind-works.org/cms/index.php?id=637
Wind powered car! https://alcse.org/the-american-wind-powered-car/
A commercial efficient 100kW wind generator: https://en.wind-turbine-models.com/turbines/1682-hummer-h25.0-100kw
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Hi thanks to one of my viewers for pointing this one out. Well, yes, we're taking a look at renewable energy again, but this time it's not solar. it's wind and it's revolutionary. Sing it with me.

Power to the people, Power to the people. Right on say we want a revolution. So what are we looking at here? Well, it's a company called American Wind and they've got this revolutionary new wind turbine technology America Wind? Who are we? It's a company that has developed the most state-of-the-art micro wind turbine ever brought to market. It's a complete thought change in the wind turbine industry.

Never before has a 1 kilowatt generator been squeezed into a generator just 3 inches in diameter. But a powerful generator is nothing if we do not have the ability to capture the energy from the wind. The next step was to develop a blade design, not using a simple airfoil much like the wing of an aircraft, but to design the blade to a great maximum torque and speed. To do this, our founder Robert Yeast used his background from designing jet engine turbines to develop a blade design that use both aerofoil technology and jet engine technology.

Wow So their product is what's called the micro Cube and it's a 9 inch cube that can generate one kilowatt. Can you smell it? Yeah, and they claimed it to us. Start spinning up it just 1 to 2 mile an hour winds. So that's actually pretty good.

So you know we're not worried about that. We're worried about these magical power output claims. Per the US Patent Office America Wind has developed the first of this kind of generator. No, they haven't.

We'll see that in a minute. But not only does it produce more power in a small space, it is nearly frictionless. Wow This is heavy. Where's my KY jelly? But the thing about this is that they actually take the micro cube and then they just stack them together because each one is apparently a 1 kilowatt ray - generator.

so they can stack them into from one into three cubes like this. Or they can go bigger. You can get 50 of them for the wind wall. All this giant advanced twin wall.

You've got a hundred of these things. So they claim this is a 100 kilowatt wind generator. One of the first things I notice is that some of their claims aren't consistent. Let's have a look down here at this triple one down here.

They're good little Asterix next to it and it says optimal wind speed up 45 miles per hour is their optimal wind speed ie. the speed at which it produces the most like the peak energy. yet. Let's go and look at the advanced wind wall here, which is just the same generator except you've got a hundred of them in this little fancy box on a little rotating pivot thing so I can pivot with the wind.

and let's have a look a bit deeper so it's a hundred kilowatts. It's got a hundred of these units, a cutting speed of 1.5 miles an hour, which as I said, is actually pretty good. It's better than most on the market, so yeah, that's all right. and cuz Survive speeds up to 140 miles per hour.
And look, they've got the power curve here is around output and we achieve 100 kilowatts around 17 miles per hour and it's actually capped at a hundred kilowatts. As you can see here, which is common in wind turbines, they'll actually have our loads that'll kick in and actually bleed it off to prevent. you know, damage to the units and stuff like that. So this is the typical response of a wind turbine and they claim it's doing it at 17 miles per hour.

yet one cube on its own is 45 Wow and they also claim the light grey line shows the power curve of our traditional wind turbine competitors. Peaking here at are around about 30, 31, 32 or something miles per hour. Well, let's go actually have a look at a real commercial one. We'll check out this website later because this has got some interesting data which when we get to the data on the white board, this will be interesting.

So this is an equivalent hundred kilowatt generator, a hammer, and one and it's got the power curve. There it is ten meters per second, it hits its peak hundred kilowatts and you can see it's got it. kicks. The limiter kicks in there and limits that to avoid damage.

So yeah, that's about 22 miles and 22 miles an hour. So yeah, I'm not too far off this one. So yeah, and check out this graphic here. - thank you.

Very handy because I didn't have to then go actually produce a graphic and scale it to size my sauce I'd say they've got that about right. They claim that there's like two and a half by three meter. a hundred kilowatt away array is equivalent to a large turbine like this. and the advanced power wall To this like a solar panel.

4.4 watts per square foot. They claim a conventional wind turbine is forty four point four watts per square foot. So ten times better than a solar panel. Bit dodgy there to begin with and we'll go into the calculations in a minute and show why.

But the advanced wind wall. Look at this two orders of magnitude better than a solar panel Wow and one order of magnitude ten times better than a conventional wind turbine. Ah, blown away, there's the specs for those. Plan long of a weighs 900 pounds, 70 miles per hour ambient air speed.

But wait, the CEOs won an entrepreneur of the Year award. Let's go to the videotape Robert Yost CEO and President of American Wind. Many congratulations are winning the European CEO award for Entrepreneur of the Year Energy Technology North America 2018. Thank you so much! How much energy can you get from it? Each microwave creates one kilowatt of electricity and it has a new generator design that hasn't been built in other years.

What we describe this thing is not a propeller airplane like the big wind turbines. It's more like a jet engine technology, so it actually increases the wind speed as it goes through it as compared to slow it down. With the big wind turbines, you take a micro cube. You put it into a great big panel we call a wind wall.
about three meters tall and about two meters wide, and it creates roughly 100 kilowatts of electricity. So what are the benefits of having smaller turbines arranged this way? well? We pick up more wind surface area. The big wind turbines only pick up about 3% We pick up about 90% of the wind surface area and that's where you get most of your power from is the total surface area. You heard the claim there that traditional wind turbines only pick up about 3% of the surface area compared to their one which picks up 95% And you can see why they're claiming that, because if you draw a circle around there, look at those thin little blades and you calculate the surface area.

Yeah, it's around about that 3% thicker. And of course, their big power wall thing. Look, it's capturing almost practically everything as he claims 95% Unfortunately, that's not true. That's not how wind turbines work.

You can't just take the surface area of the blade because they're designed as Aero foils and then that slows the wind down on a surface and turns the turbine and gives you a greater effective capture area so to speak. I Won't Let's not go into the you know the huge details of wind turbine designs because we can look at the data which proves that this is the case. So please excuse the crude ear if the model didn't have time to build it to scale on a paint it. but we've got a typical three bladed wind turbine here.

It doesn't matter how many blades and we're going to calculate the energy or the power in the wind that can go through a particular diameter wind turbine. So in this particular case, I've drawn like a volume a circular volume of air here. So we've got the area and D is the distance are the basically the thickness of the air there and then assuming that passes through the wind turbine. Now we have to go back.

As I said to first principles here: Kinetic Energy. You almost certainly learnt this formula in like a first-year basic science in like high school science should learn, this wouldn't you? Kinetic energy equals 1/2 MV squared or 1/2 times the mass times the velocity squared basic physics. So we actually could jump directly from this kinetic energy formula to this industry standard formula here that's used in all of the wind power energy industry. It's It's the formula that explains it all.

but I Thought we'd just add derive this very quickly so you can skip this bit if you don't care about transforming that into the where this actual formula comes from. So anyway, let's go. The volume of air inside here is the area square area times the depth here, and the air density is a row that's not a P that's actually a symbol. Rho is the mass divided by the volume here.

I've got a volume is just VL there to differentiate it from velocity, which is V so we can just rearrange that. mass equals R Rho times the volume. Now we can take our kinetic energy formula up here, and instead of having the mass, we can substitute in Rho times the volume times V squared. So it's the same formula we've just substituted in some equivalent stuff.
Now of course, the volume of this is the area times the depth. So we can just change that from volume to area times, the depth easy, and the depth. here. this can be replaced by velocity times time.

so we're just substituting in just to get this to pop out the other end. Now, because we've got two velocity components in this formula, V squared becomes V cubed. And here's the last step: Power: Because we want power, not kinetic energy. Power is kinetic energy divided by time.

So if we divide this part here by time, the T's cancel out and bingo you're left with power equals half times Rho which is the air density times the area times velocity cubed. Bingo! That is our industry-standard wind formula that applies to all wind turbines and actually applies to our liquids as well. But anyway, our because density is just air or a liquid or whatever it is. Whether or not you have a like a water turbine for example, you're going to be using the same formula but this implies to be meal.

This is the industry standard formula. This is how much power is available in a given volume there to feed in to your turbine. He can't get any more than that. Now we have to take a look at this row figure which is the air density and this changes with temperature and you can go look this up in various our charts at a standard 20 degrees Celsius it is actually one point two oh, 41 kilograms per cubic meter.

So if we actually put this into the formula and let's take a standard 10 meter per second wind speed which is about 20 little over 20 miles an hour, that's a pretty much where the peak of most wind turbines will. We designed pretty much a standard calculation figure in the industry. so 10 meters per second power equals 1/2 times. one point, two, oh four, one times.

Let's put per square meter So one square meter times the velocity. 10 meters per second cubed here and that gives us 602 watts maximum Ideal. This is the maximum ideal power that you can actually have in a 10 meter per second wind at 20 degrees C at that air density. So any time you see any marketing claim whatsoever for any sort of wind turbine that can get greater than 602 watts per square meter area, you know they're full of crap because that would require overunity ie.

getting more power out than what you put in from the wind. In this case, you're not putting it in the winds or any there you're just extracting from the wind. There's no way you can possibly get more than six hundred and two watts per square meter at that particular air density. Now, as it turns out, even the most ideal wind turbine can't achieve this figure.
Why? Well, not only because like there's the like, the turbine hubs in the way and things like that and the blades don't capture, you know precisely a hundred percent of the wind. They act as air foils and that increases the effective capture area. That's why a lot of you know you commercial huge commercial ones are this are three bladed design. Like this is kind of like an optimized design for this type of wind speed and capture area.

And if Chansey and things like that. Now there's this thing called Betts's law. So there was this spa dude called Albert Betz early last century who I came up with Betts's law. He wasn't the other thing somebody else came up with the same time.

but anyway, it's called Betts's Law. It states that you can't extract more than 59.3% of the kinetic energy going into a wind turbine or a fluid turbine. That is because when it actually flows into it like this, it actually spreads out, it can't capture at all and that there's a it is analyzed. All this and figured out that that is the absolute maximum figure that you can extract from it.

So anyone claiming to extract more than fifty nine point three percent of this 602 watts per square meter at twenty degrees at that air density is violating Betts's law and I believe nobody's actually done it yet. There's a few people who claim that you can actually do it if you also harness our thermal type stuff with it and other things and this applies. By the way, Betts's law applies to open frame wind turbines like this ones that don't have the frame around them and all the designs that have actually tried this to actually put like encase them into tunnels and things like that. To try and get around Betts's law, they have all sort of come a guts are.

In practice it's great in theory and apparently you can actually do some simulations to prove you can get better. but when you try and do it in practice, bets as law wins every time. So applying Betts's law to our maximum ideal figure here x 59.3% gives us three hundred and fifty seven watts per square meter. And this has actually called the power Density which again is an industry our standard figure that you'll find in the datasheet for wind turbines.

And here's one of the data sheets for a huge hundred kilowatt or I think two hundred kilowatt wind turbine which shows it's just over three hundred watts per square meter and that's typically the best you'll get is like 80 to 85 percent. or because as I said, you know you've got the hub in there and you've got other sort of you know losses to do with the blade design and things like that. But you know a good wind turbines around about 80% of the Betts's law, not the actual maximum power. So let's look at this wind wall in particular, the biggest one, the hundred kilowatt wind War, which they're supplied the power graph for, and the full specs.
They actually specify 100 kilowatts output well which is electronically capped and they claim that very clearly at 17 miles per hour which is seven point six meters per second which is below the industry's standard 10. but you know it doesn't matter, it all comes out in the wash. Now it's size is 96 inches by 120 inches. I'm being generous and assuming that all of it flows into the wind wall, there's no you know losses anywhere else.

that's 7.4 square meters. So you plug that into our industry standard formula. You can't avoid this. And bingo, You get 1955 Watts, just under 2 kilowatts, not 100 kilowatts as claimed.

Wah-wah-wah-wah And there's no gettin' around this. the power in the wind that goes into your wind turbine. Unless you're fun like get a big funnel and you capture it all in or something like that, then you're gonna be relied upon this formula and all it's dependent upon is the square area of it, times the velocity squared, and then the road. These are fixed factors.

That's it. That's the maximum power you can put into this thing. So is. They're claiming they can get a hundred kilowatts output for something, that with this given square area, in this given velocity, you can only have less than 2 kilowatts ideal maximum in the wind that's over unity.

That's getting more power out than you put in. Not possible. Sorry. So right there we see a basic calculation of how much energy goes into your wind turbine from the wind.

It's completely busted. I Don't know how anyone with a straight face can make this sort of claim. It's just ridiculous. Now, they do claim that they actually do somehow violate Betts's law because they have the blade design.

They have a vacuum behind there and you know all that sort of stuff which increases the effective speed. And like all sorts of stuff like that. okay, whatever, you can muck around with that sort of stuff until the cows come home. But the fact is, for this given area capture area, you've only got less than two kilowatts maximum to put into the system.

So even if you violate Betts's law and get your maximum at 600 watt power density per square meter still nowhere near like 50 times less, then you claim 200 kilowatts. You just can't do it. So I don't know why anyone takes these sort of claims seriously. Like these sort of stuff you can do on the back of an envelope and you're going to just bust it.

Don't even bother wasting your time with claims like this. It's ridiculous. And they just went to the United Arab Emirates and trade mission to the United Arab Emirates and will. How will this help Alabama's businesses succeed? Well, American Wind was one of eight companies that took part in this trip.

CEO Robert Yost Tells me that it's trips like these that are not only important to sell Alabama products but also to add new partners in making them Thought about. The turbine engine blade is so revolutionary they get delayed. So I'm a big wind turbine. why can't we use a turbine blade? So that's where I started at and then from there I developed the generator.
That generator became the basis for what used Card Micro Cuba. Our generator is a very free-flowing returning generator. The US Patent Office Come back. It says the first new generator design since 1896.

Michael Cube is a small wind turbine designed to generate power more efficiently than standard large wind turbines you might see in fields or offshore. The device went through 39 revisions in order to get to version number 40. The aerodynamics of the turbine, taking it from having a vacuum inside to outside to eliminating the vacuum. That was a big change.

Create a 70% more power. Hang on You just said 70% more power. Well this one is 10 times order made to chewed. More So well.

Now it turns out that 80% claim is probably not the mark because he didn't invent this idea. It's not new, let's have a look. It turns out that there's a bunch of companies who have been developing these jet engine. They're actually called ducted wind turbines because they gotta basically a duct around the blade.

There's a company called Flow Design or Ogen as the company Flow Design way back in 2008. This is actually before - before they got their patent. here it is I'll link in the pattern down below if you want to have a look at it. We won't go into details us like Nair applied for in 2012.

Anyway, there's tons of prior art on these ducted wind turbines or these jet engine type turbines developed We - and they can generate electricity at half the cost of conventional turbines. The company recently raised six million its first round of venture financing and actually raised a lot more money than that. and they went belly-up As we'll see anyway, typically a wind approaches a turbine. almost half the air is forced around the blades rather than through them and the energy in that deflected wind is lost at best.

Traditional wind turbines only capture 59 percent and it's all the same stuff. It's a shroud that detects it and directs air through the blades. speeds it up. Increased power production generates much as much power as a wind turbine blades with twice as big diameter.

So this companies which got massive venture backing from huge corporations like a real even Al Gore like backed this right. This is how serious this company was and and they were only claiming that like you know, twice as big. they're not claiming this ten times. Stuff that American Wind is.

Anyway, what went wrong with this flow design companies thing? Well, they installed quite a few of them. This one's on Deer Island Anyway, it looks very unconventional. It doesn't look like this design, but it's You can basically see its you know it's got a traditional three bladed design with like a casing around the outside. So the company is our Ogun Ojen and they raised 150 million dollars including the attention of former Vice President Al Gore and he was a senior partner at one of the investors.
I think a late last month the company entered a receivership and its assets are up for sale. Found in New Zealand they wrote had to write it down to zero. They thanked our gut sir I shouldn't laugh. That's people's pension money.

Jeez, this is great. What happened? We see this kind of thing periodically where somebody says they have something better than conventional windmills says poor Guy, a renewable energy analyst and author of the book Wind Energy for the rest of us, Usually they're crackpot inventors and they don't get much beyond a fancy website. But one of the things that is different with Ogen is the sheer scale of the money wasted on this venture and the names associated with it That puts it in a different class. One issue with ducted wind turbines is that while fiberglass ringman can direct more wind through, the blaze creates a tremendous amount of drag on the device.

Whether whenever wind is present, that drag means that the tower holds everything up, has to be engineered to be sturdier and more expensive than your garden-variety tower. As a result, ducted turbines tend to stand less tall than conventional turbines, so they miss out on the Briscoe winds higher up, and that's one of the things with this thing. It's designed to sit on a ground or a small pole. It's not designed to go high up where the wind the better wind streams are and they might claim are, but that's compensated for the fact that we can go at lower wind speeds and things like no, no, sorry, not buying it and wow that Kiwi pension fund lost 50 million dollars in that ducted turbine fiasco project.

Wow That is sad. I Know that this one is. you know, more traditional three-bladed design and we're going to the data in a minute to this you know turbine theme that they've got this. You know, like how many blades on that? You know, ten blades or something and apparently some former employees of the company they're They're speaking out several engineers.

This is all anonymous source stuff though, so take that for what it is. flow designers. Subsequently, Ogen made outlandish claims about what their then theoretical wind turbine could do. They claims were not as outlandish as some, but flow design and Ogun still fell into a common trap.

A promising that they're unproven design was far superior to existing wind turbines that work reliably worldwide. and there's the catch reliably. I Love this bit. I Am taking the time to post about Ogen because I have a dog in this fight at the height of the PR Blitz launched in 2008.

Yeah, they went bust, as did all these other companies. A leaner energy, their fantasy wind turbine. or if it's too good to be true, you can be old. Leak this down below.
You can read all these articles: the Windtamer ducted wind turbine unofficially Kaput green investing. This is why you avoid story stocks ie. ones that just have a story for many. Alabamians The 2011 tornadoes brought devastation and destruction.

But for Robert Yost they also brought inspiration. Well, basically my wife and I we were sitting on the back deck and this pedestal fan was blowing in the breeze. You couldn't stay inside because it was too hot with no air conditioning. So what do you do? I Thought about the turbine engine blade is so revolutionary the will get delayed.

So I'm a big wind turbine. why can't we use a turbine blade the she weaned in Verlox. Another sad entry into the ducted. Turbine Hall of Shame Like many others arising in a blaze of media hope in the tech press, unfortunately she winds pitch snares several unsuspecting high-profile clients accusing the Nature Conservatory and the Michigan National Guard of this thing.

Oh yeah, that puppy's got to work Doctor Turbine debacle who will pay to remove it? She we inducted disaster, another ducted device dead the sheer wind in Verlox. Bankrupt. She we demo turbine in need of demolition. Well you this one demolish them all.

None of them work well. They work like solar, roadways and other you know things work. But yeah, they're just not as practical as and not nearly come close to their claims. If they did Hey the wind industry would take them up and they'd be billionaires.

But no, they've all gone bankrupt. All hype, no substance. The development, promotion and marketing in the Vortex seven configuration has all the hallmarks of the hubris characteristic of defuser augmented wind turbine inventions. So I that diffuser augmented it means that like they've got outside shells ducted.

In short, the hype exceeded the termites. performance of the company's promotion exceeded its ability to deliver. Some of the country's best engineers were swept up in the youth. Oriya Produced by one of New Zealand's most charismatic promoters, Turbine Company runs out of paths.

Vortex closed, no closure, no surprise, and I almost forgot back in 2015. I'll link in this article: He tried to put four of these wind turbines on the top of his hybrid car to try and do a road trip across the U.s. Anyway, I won't go into details, but don't be misled. the car will still be a hybrid.

It isn't a perpetual motion machine, but the miles per gallon will exceed anything seen on the current gas hybrid, creating a car that will really need refueling. But this is great in his lab. I Saw where Yost and his staff. we're testing what they whether they can break physics.

They currently have a small USB fan propelling one of their turbines. within the next few weeks. they plan to plug the USB fan directly to see if they can power the fan with power from the turbine that the fan is creating. Powerful.
Wrap your head around that they are skeptical that it will work, but looking forward to find out. Wonder what happened to that experiment? I Ain't no idea what the result of that would be. So there you go I Hope you enjoyed that and found it interesting. And it's not just about this wind war one as you saw, there's like half a dozen or more of these different, even just half a dozen huge projects that have tried to have this ducted fail and beat Betts's law and try and do it.

But anyway, this one was just ridiculous in its claims. It's yeah, more power out when you put it in. for a given square, it's completely busted right off the bat. I'm sorry for spending half an hour or whatever it is on this, but yeah, that's just.

that's just nuts. so it doesn't matter how much snake oil you rub on the bearings inside this thing. if they manufactured by gray-bearded nude virgins, can I beat the laws of physics Captain Anyway, I Hope you enjoyed that. And by the way, you can actually get my Fluxgate condense a t-shirt hand-drawn by me in the store down below.

And don't forget to follow me on library. TV I'm trying to crack a thousand subs on there trying to beat Barna Cleese He's got like 1500 subs or something like that. Gotta beat him anyway. Hope you liked it.

Catch you next time.

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22 thoughts on “Eevblog #1271 – 100kw windwall generator busted!”
  1. Avataaar/Circle Created with python_avatars Mappy Land says:

    they also can't spell "not" correctly.

    the website said: "Note: note for sale"

    their ideas are so hot, there's no time left for proofreading.

  2. Avataaar/Circle Created with python_avatars Gordon Welcher says:

    Please do not mix stereotypes.
    The mental image of grey bearded nude virgins is quite terrifying.

  3. Avataaar/Circle Created with python_avatars Rollin Shultz says:

    So what happens to this formula with a Savonius type turbine where you must include drag to be subtracted from the captured drive wind?
    do you just do that as a separate calcullation of the air volume?

  4. Avataaar/Circle Created with python_avatars splashpit says:

    So three years on and iv never seen this product in the wild or even someone that has installed it on their house build

  5. Avataaar/Circle Created with python_avatars ChaDiddy X says:

    Hey moron, now that it is up and running with better results than what we thought, it might be a good time to issue an apology and take this down. The military sure does love the results they are getting.

    But we here know you won't do that. You were even invited to the facility, and you declined. 😂😂

  6. Avataaar/Circle Created with python_avatars David Potter says:

    That Betz fellow never saw a tornado, did he?

  7. Avataaar/Circle Created with python_avatars rosskrt says:

    "excuse for the crudity of the model, didn't have time to build it to scale or paint it"

  8. Avataaar/Circle Created with python_avatars One Two says:

    I think the hidden part of their claim is that it is "most efficient" at 17MPH, but its power rating of 100KW is probably at max wind speed allowed of like 140mph…

  9. Avataaar/Circle Created with python_avatars Goose says:

    Maybe under some technicalities, like in a sealed wind tunnel that forces air through it at the maximum rated speed of, they might be technically correct. But I'm too lazy to do the math

  10. Avataaar/Circle Created with python_avatars ET says:

    Are you kidding me? I made a joke Elon Musk impression post like this on reddit last week.

  11. Avataaar/Circle Created with python_avatars Richard Cooney says:

    +Hi , great show, Question can I connect a 150 watt solar panel direct to a heat element put in a sand container to make a heater ?

  12. Avataaar/Circle Created with python_avatars jtcustomknives says:

    Did I see thy show that the dingle wind turbine put out 40v? That would be 25amps to get 1kw lol.

  13. Avataaar/Circle Created with python_avatars jtcustomknives says:

    So their wind wall does about 1kw. Did thy mess up their numbers for the wall verses a single unit lol.

  14. Avataaar/Circle Created with python_avatars jtcustomknives says:

    OMG the noses on those guys in the CEO award video lol

  15. Avataaar/Circle Created with python_avatars jtcustomknives says:

    I’m 5min but had to pause it. I thought there was a set amount of total energy in wind based on speed and surface area. I think someone did not carry the 1 in there math or transpose a decimal point lol

  16. Avataaar/Circle Created with python_avatars jtcustomknives says:

    “Heavy, there’s that word again. Is there something wrong with earths gravity in the future”

  17. Avataaar/Circle Created with python_avatars PanTwoj says:

    💩

  18. Avataaar/Circle Created with python_avatars Sergej Koch says:

    A lot of money "invested" just to make us laugh. Next time we should pay this money directly to stand-up comedians.

  19. Avataaar/Circle Created with python_avatars BenjaminGoose says:

    After watching the "interview" I see where the confusion arises: he's comparing his product to wind "turbans".

  20. Avataaar/Circle Created with python_avatars Vibycko says:

    im still watching, so sorry if it's already said in the video, but I recall reading about wind turbines, and they need to let through like 2/3 of the wind, otherwise it would be more of a sail, a wouldn't spin well.

  21. Avataaar/Circle Created with python_avatars Seth B says:

    It smells like someone broke wind.

  22. Avataaar/Circle Created with python_avatars BobC says:

    That V^3 term builds fast, so 47 MPH (21 m/s) takes the ideal power up by nearly an order of magnitude. To a bit under 20 KW. Still nowhere near 100 KW.

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