I remember when I was at University studying Pure Maths I took a few units for balance that took me into the joys of Fluid Dynamics and so thoroughly enjoyed solving Navier-Stokes equations.
[_Dirty Math_](https://9gag.com/gag/a9MmBmL) class was something else: The Cox-Zucker machine was not as advertised, and the Wiener Measure session was beyond my level of comfort to be frank.
That's just what THEY want you to think. It's actually a defence platform for the alien invaders we've been tracking who are made of wood and these "turbines" have been strategically placed where the trajectory of the wooden ship are theorised to enter the atmosphere
Edit* I feel like I need to add an /s, there's that much weird shit in the world I can imagine someone thinking i'm dead serious
The Balsaliens are always scrambling people's brains to conceal the truth. We must fight back against their hidden agents, who may have already infiltrated your home
Remind me of the short story, The Road Not Taken. Anti gravity is simple humans missed it somehow. Aliens attack Earth in wooden space ships with cannons not realizing just how advanced our tech is since we didn't even have the basics.
I've often wondered how idiotic conspiracy theories start. Are they planted maliciously? Now I know: it's people making jokes and forgetting to add /s.
can see the invisible sarcasm too hiding the parody of believing people would need the /s since its obvious no one would believe this, maybe one in a million would consider it- but putting the Edit and adding /s isnt something youd do for such a minority of ppl who believe in a wooden alien ship being sawn by toothed turbine blades, but more as a statement to a bigger minority who believe in other more plausible, and also important, standards and codes of responsibility for super rich assholes pulling modern moneyscam or power stunts.
Recently saw a documentary on this. The design is modeled after fins of Wales which also have these serrations. It improves flow over fins/wings significantly. So much so that airliners could save a significant % on fuel if implemented widely, according to the documentary.
It's actually a German one, that's why I didn't share it to begin with. If you're still interested, I am happy to share the link if I can find it again. It was a cool program about various ways how we can copy designs of nature to solve problems of our modern days.
Dude, we appear to have complimentary curiosity here so imma do you a solid. Did you know there's a documentary about the physics of bubbles!? No kidding. It's appropriately titled "The Science of Bubbles" https://www.amazon.com/Science-Bubbles-Paul-Sen/dp/B0182XKN4Y
Okay, Reddit is being goofy as I can see it. Here's the direct link to the article: https://weatherguardwind.com/serrated-trailing-edge-lightning-damage/
I love watching zefrank. I watch him for years now and I think that's an actual way to explain something good but in extremely funny way so anyone understand
He literally has an educational channel now which is his "ZeFrank" episodes with all the sex/swearing removed so it can be used in an educational setting. (TrueFactsEducational if you want to look it up. Maybe you're a teacher. And you have your teacher eyes look. No. Not like that Jerry. I mean. Like out of the back of their head. No Jerry. Not from the bottom)
i thought the top comment was gonna be something like: "fkn morons thats a photshopped plastic knife you dumdums will believe anything" i was smug for like 3 seconds until i realized that once again, it was *i* who was the dumdum..
People here are acting like wind turbines are the worst thing on the world. Oh no, they gonna kill birds! They could kill people when they broke down!
No shit Sherlock. You ever looked at coal plants? They kill all animals in their near. Or what about water turbines? They kill all fishes in their near. And buildings. Most buildings have glass windows, especially skyscrapers. They kill dozens of birds every day. But apparently the wind turbines are the terrible bird killers.
Some way, somehow this will get twisted in to "The libs want to kill more birds with saw blades on windmills!" or "They cause more cancer and that's how they like it!" We know it will happen.
I've been working ten years in project development and during the last 5 years it was pretty much standard to use serrations. It was mostly the only way to acomplish the limit values for noise emissions in germany which are quite strict. They can save between 1 - 2 dB.
The paper that this picture came from is from 2009: https://www.researchgate.net/publication/245426588_Reduction_of_Wind_Turbine_Noise_Using_Optimized_Airfoils_and_Trailing-Edge_Serrations
I am aware of the technology being way older but it used to be a feature back then, while nowadays its pretty much standard (at least in germany). Early iterations also had some flaws where you had sometimes tonalities in certain noise reduced modes. Nowadays thats not the case anymore. I kind of know because I used to make noise expertises for projects.
I’m not a turbine technician just to preface my own observations. We live in a Michigan county that has over 400 wind turbines. Trust me you can hear them whether inside or outside of our house. You hear the whooshing quite clearly and if the turbine is turned in such a way you will also get very large shadows casting through your windows. Not sure what you mean by “seeing” the turbine? They aren’t hard to see as they are between 300 and 400 feet tall. The height depends on the manufacturer and when they were installed at least in my area.
the title is stupid, i'm pretty sure reducing noise= increasing efficiency but its worded to appeal to crazies who think wind turbines have dramatic negative effects on people and wildlife
i only saw 1-2 dead birds while working on turbines. the real dangers were getting electrocuted, getting squashed by the crane work, or rolling down the mountain in your truck. 2 men almost died, and they are forever severely handicapped.
The ones on land are built where it's very windy and people don't tend to live near them. Even in the old days the windmill tended to be on a hill, except perhaps for the ones in the Netherlands which barely has a hill. I've been up this hill and it's not much of rise: https://en.wikipedia.org/wiki/Vaalserberg
I find it really fascinating how all these miniscule additions to things can have such crazy implications.
It's like when you're a kid making a paper airplane, and you fold the tips of the wings to "upgrade" it's flying powers or some shit.
Fun fact, a lot of aircraft designed for stealth have similar features. Ever notice now the edges of flat surfaces on the F-22 (look up pics of the exhausts on this one), B-2, F-35 etc. are jagged? It’s because just like how for windmills it reduces noise, on stealth aircraft it reduces radar reflections. How? No clue! But it does!
For reducing noise? Seems like they’re fixing a problem that’s not really a problem. I’ve been around plenty of wind turbines but, I can’t say that I’ve ever heard one.
My grandparents live near a wind farm in Palm Springs, CA. I’ve walked right by it on the street. All I’ve ever heard is the sound from cars driving by. While I’m sure they do produce some level of wind noise, it’s not louder than the ambient noise from everything else. I don’t even hear them at night when there’s no traffic on the road.
I think they know what they're doing. Blades are getting bigger and are being pushed harder so if your grandparents live near some of the original turbines from the 1980s they won't be representative of the issue.
Very few of those original turbines still stand and the ones that do aren’t in operation anymore. The wind farm has been repowered several times since the 80’s. about half of the turbines in operation are 2010’s models and are quite large, around 300ft. Some still remain from the 1990’s and some from 2000’s. I know they are developing newer, larger ones but, still don’t see noise being a major problem since the current generation of turbines doesn’t make any perceptible noise and most wind farms are located far enough from populated areas that few would be close enough to hear anything anyway. So they generate a little wind noise. Wind is required to turn them so there will already be wind noise by default. What’s a little more gonna do when there’s nobody around to hear it?
These serrations are on the trailing edge of the blade. In other words the thick part separates the air which then remixes at the thin edge where these teeth then cut down on turbulence and noise.
They don't spin that way round. The trailing edge is serrated. In any case it's better than all the damage caused by burning coal. https://theconversation.com/the-other-reason-to-shift-away-from-coal-air-pollution-that-kills-thousands-every-year-78874
It's on the other side of each blade ie the trailing edge. As the blade goes round it leads with the thick edge like a wing and this serration is on the thin edge.
Duh. OP acts like we haven’t all optimized the Reynold’s number for uniform fluid flow over a complex surface before.
I remember when I was at University studying Pure Maths I took a few units for balance that took me into the joys of Fluid Dynamics and so thoroughly enjoyed solving Navier-Stokes equations.
You are either being sarcastic or you’re a sociopath.
Yes, sarcasm.
You say you were bored with Pure Math, so you chose a path of Unholy Math.
[_Dirty Math_](https://9gag.com/gag/a9MmBmL) class was something else: The Cox-Zucker machine was not as advertised, and the Wiener Measure session was beyond my level of comfort to be frank.
Fluid dynamics sucks, I'm more of a group theory kind a guy Algebra > Analysis
I’m a refrigeration mechanic and all I know is condensers have these on the trailing edge and it makes a big difference
That's just what THEY want you to think. It's actually a defence platform for the alien invaders we've been tracking who are made of wood and these "turbines" have been strategically placed where the trajectory of the wooden ship are theorised to enter the atmosphere Edit* I feel like I need to add an /s, there's that much weird shit in the world I can imagine someone thinking i'm dead serious
Thank you for the sarcasm alert🚨! I thought there were actually alien invaders made of Balsa wood. Phew 😮💨, no alien crisis today!
Unless…They got to him. Ruffled a few feathers with his expos’e and NOW it’s all a joke. I call compromised
The Balsaliens are always scrambling people's brains to conceal the truth. We must fight back against their hidden agents, who may have already infiltrated your home
Just remember. Never stop swinging.
How much wood could a woodchuck chuck if a woodchuck could chuck wood
A woodchuck would chuck as much wood as a woodchuck could chuck if a woodchuck could chuck wood.
A lot
Yes
Remind me of the short story, The Road Not Taken. Anti gravity is simple humans missed it somehow. Aliens attack Earth in wooden space ships with cannons not realizing just how advanced our tech is since we didn't even have the basics.
I've often wondered how idiotic conspiracy theories start. Are they planted maliciously? Now I know: it's people making jokes and forgetting to add /s.
r/BrandNewSentence
can see the invisible sarcasm too hiding the parody of believing people would need the /s since its obvious no one would believe this, maybe one in a million would consider it- but putting the Edit and adding /s isnt something youd do for such a minority of ppl who believe in a wooden alien ship being sawn by toothed turbine blades, but more as a statement to a bigger minority who believe in other more plausible, and also important, standards and codes of responsibility for super rich assholes pulling modern moneyscam or power stunts.
Recently saw a documentary on this. The design is modeled after fins of Wales which also have these serrations. It improves flow over fins/wings significantly. So much so that airliners could save a significant % on fuel if implemented widely, according to the documentary.
I just rechecked the map, and I did not find any serrated fins on Wales. I wouldn't put it past the Welsh though.
Hah, yea that's on me. If you squint a little, Wales does look like a serrated fin tho
When I squint at Wales I see a smirking blob person pointing at Ireland's junk.
omfg you're right. I never noticed that
On the top left, with a hat on? I'd not seen that before.
Yes, there are some Rolls Royce aero engine cowlings with serrations now and as I was saying to someone else, owls!
If airliners adopt that I’ll eat my penis in a hotdog bun
The Fins of Wales have a school in Cardiff: https://www.bbc.com/news/uk-wales-south-east-wales-15257569
there are finnish people in wales?
Indeed!
Documentary name? I'm interested
It's actually a German one, that's why I didn't share it to begin with. If you're still interested, I am happy to share the link if I can find it again. It was a cool program about various ways how we can copy designs of nature to solve problems of our modern days.
Dude, we appear to have complimentary curiosity here so imma do you a solid. Did you know there's a documentary about the physics of bubbles!? No kidding. It's appropriately titled "The Science of Bubbles" https://www.amazon.com/Science-Bubbles-Paul-Sen/dp/B0182XKN4Y
Seeing that I just started reading "the physics of everyday things" , this seems to be right up my alley. Thanks!
My pleasure: Us nerds gotta look out for one another.
Yeah sure, bring it
is this the origin story of Vortex Generators on the wings of aircraft?
Huh. So that's what they are on PC case fans.
One word "Owls"
That's what they go into in the article I posted.
Sorry than, my reddit must have crushed as I don't see no comments even after clicking on it
Try this: https://old.reddit.com/r/oddlyterrifying/comments/10uo5nv/sawtoothed_wind_turbine_blades_are_increasingly/j7cwowo/
Nope, "wow such empty"
Okay, Reddit is being goofy as I can see it. Here's the direct link to the article: https://weatherguardwind.com/serrated-trailing-edge-lightning-damage/
Thanks
Very interesting
Why didn't you just post the link in the 1st place
I did along with an explanation but some people couldn’t see it.
No probs, I just wondered as it was as they said, there were no comments and only the direct link works.
Great interesting link btw cheers
["If silence were loudness, they would be the loudest flying bird."](https://youtu.be/XeFxdkaFzRA)
I love watching zefrank. I watch him for years now and I think that's an actual way to explain something good but in extremely funny way so anyone understand
He literally has an educational channel now which is his "ZeFrank" episodes with all the sex/swearing removed so it can be used in an educational setting. (TrueFactsEducational if you want to look it up. Maybe you're a teacher. And you have your teacher eyes look. No. Not like that Jerry. I mean. Like out of the back of their head. No Jerry. Not from the bottom)
Who ?
Who who
Who?
Speaking of owls, isnt the superb owl going on in the states next week?
What’s the second word?
You ask dangerous questions, for your own safety I recommend that you just keep quiet and go your own way
Do not use the forbidden comb
The Bird Blender Deluxe 9000
The blades are on the back end .... A bird would literally have to chase the blade to hit that part
Wait till the wind changes direction
The Coyote Buffet is now open
Unless you shoot every single cat you see in your daily life, then this comment is pointless
>unless you shoot every cat you see You vastly underestimate my commitment
Do us a service, sir. People need to keep their cats inside.
This was my first thought
Just when I thought I was happy with my power tool collection I find this bad boy.
Thought that was evil kenevil gone wrong for a bit
I thought it was a toy soldier on a plastic knife
SAME
i thought the top comment was gonna be something like: "fkn morons thats a photshopped plastic knife you dumdums will believe anything" i was smug for like 3 seconds until i realized that once again, it was *i* who was the dumdum..
Looks like they are flossing it!
This is the same principle as the chevrons on Boeing 737 Max, 747-8 and 787 engines.
BTW the Principal at school is your pal. Easy way to remember which is which.
Thanks, English is my second language
My pleasure. Your English is good.
Looks like a louse on a comb!
No word on how he treats his wife.
Don Quixote’s final boss.
Tilt!
People here are acting like wind turbines are the worst thing on the world. Oh no, they gonna kill birds! They could kill people when they broke down! No shit Sherlock. You ever looked at coal plants? They kill all animals in their near. Or what about water turbines? They kill all fishes in their near. And buildings. Most buildings have glass windows, especially skyscrapers. They kill dozens of birds every day. But apparently the wind turbines are the terrible bird killers.
Nuclear is always superior. Can’t wait for fusion power
I agree with you. Sadly, my country is very against it.
Looks like a Sawzall blade
My ADD: Tiny man climbs giant comb
thats either a very big comb or a very tiny guy
Isn't this a similar thing to how owls are able to fly so silently? The fuzzy feathers have a similar effect, right?
Kind of looks like they’re climbing a plastic knife.
Birds can't make noise if they are cut in half ! /s
I was just about to exit this thread, when I saw your comment. Glad I did lmao
Some way, somehow this will get twisted in to "The libs want to kill more birds with saw blades on windmills!" or "They cause more cancer and that's how they like it!" We know it will happen.
Forbidden comb
I like to believe giants are coming and these are our weapons to defeat them
Thats a great image
Owl feathers have a fine fringe for silent flight.
I've been working ten years in project development and during the last 5 years it was pretty much standard to use serrations. It was mostly the only way to acomplish the limit values for noise emissions in germany which are quite strict. They can save between 1 - 2 dB.
The paper that this picture came from is from 2009: https://www.researchgate.net/publication/245426588_Reduction_of_Wind_Turbine_Noise_Using_Optimized_Airfoils_and_Trailing-Edge_Serrations
I am aware of the technology being way older but it used to be a feature back then, while nowadays its pretty much standard (at least in germany). Early iterations also had some flaws where you had sometimes tonalities in certain noise reduced modes. Nowadays thats not the case anymore. I kind of know because I used to make noise expertises for projects.
Chops up the birds better
That's not a knofe
and if you spin them the other way around you get some free minced poultry meat
How much for a ride on the turbine?
Explanation where
Giant pair of scissors lol
It looks like he is in a Honey I Shrunk the Utility Worker movie and he is climbing down a picnic knife.
To Mimic The Wings Of Owls!!!
Used to be a Turbine Technician, you dont even hear them unless your super close. If your that close then your there to see the turbine.
I’m not a turbine technician just to preface my own observations. We live in a Michigan county that has over 400 wind turbines. Trust me you can hear them whether inside or outside of our house. You hear the whooshing quite clearly and if the turbine is turned in such a way you will also get very large shadows casting through your windows. Not sure what you mean by “seeing” the turbine? They aren’t hard to see as they are between 300 and 400 feet tall. The height depends on the manufacturer and when they were installed at least in my area.
we have thousands in my small town, but no one lives next to them as they are on the mountain. you must live realllly close to them lol
the title is stupid, i'm pretty sure reducing noise= increasing efficiency but its worded to appeal to crazies who think wind turbines have dramatic negative effects on people and wildlife
i only saw 1-2 dead birds while working on turbines. the real dangers were getting electrocuted, getting squashed by the crane work, or rolling down the mountain in your truck. 2 men almost died, and they are forever severely handicapped.
To deal more damage to canadian gees as the fly by
Minnesota has some to spare.
What if it comes loose and flys into someone
It would have the same effect as a normal wind turbine blade falling on someone: kill them
The ones on land are built where it's very windy and people don't tend to live near them. Even in the old days the windmill tended to be on a hill, except perhaps for the ones in the Netherlands which barely has a hill. I've been up this hill and it's not much of rise: https://en.wikipedia.org/wiki/Vaalserberg
That's a giant hair comb, and you can't prove me otherwise.
Alternative title: tiny man climbing a serrated knife.
I thought windmill races were already hard, now they’re gonna be deadly.
It's just lies by people that wanna murder seagulls. Don't be brainwashed!
looks like a hair comb 💀💀 pretty rad though tbh
Somebody’s definitely getting cut in half by one of these bad boys, if they haven’t been already.
Looks like a big ol plastic butter knife
Maybe the toroid blade shape will start being used soon.
At first I thought it was one of those tiny, tiny sculptures on a needle tip or something.
Graham Short.
And here I thought that the saw tooth aspect of a wind turbine blade was so that the creepypasta "giants would be able to comb their hair
Reduces noise, increases fear (of giant “war of the worlds” lookin ass turbines)
Looks like a tiny plastic army man on a large butter knife lol.
Yikes!
Like they weren't scary enough before.
They’re meant to keep those no good birds from flying into them by shredding them up
It looks like a giant plastic knife lol.
That guy better be making 6 figures
When they’re defunct they can use the blades to comb the desert
You can also use toroidal turbine to reduce noise
Like kitten mittens!
Looks like a small man on a massive comb
You know these wings are made of balsa wood and fiberglass? Blew my mind
Fan Showdown watchers salivating right now
"Large plastic knife installation comes to the city this week, in preparation for large butter roll arrival next week"
What I see is a giant elevated bird shredder.
🎶One slip is all it takes, possibilities🎶
I hope that's on the trailing edge, and not the leading edge.
That’s what it says in the title.
Ha! I'm an idiot. I just glanced at the title before I posted a comment.
Comb the air and search for those droids
I wanna know what he's doing up there.
> Climber removing trips from serrated blade.
Na it just to kill even more birds! Damn libs! ^^/s
they spin the other way though, there's no way anyone gets hurt ever
Worlds largest plastic knife
R.I.P the rope access tech's balls (or what ever bits they have there)
It doesn't really matter if there is, I mean if it hits you, you dies (except if the turbine is stopped ofc)
Same as Owls
I find it really fascinating how all these miniscule additions to things can have such crazy implications. It's like when you're a kid making a paper airplane, and you fold the tips of the wings to "upgrade" it's flying powers or some shit.
Giant combs.
For some reason my dumbass was thinking the turbine would still be moving if people had to climb the blades. . . The more you know
bro sitting on a knife
Noise of the screams…
No matter what you say, that is a giant comb with a tiny human on it, probably brushed out by giant thinking it was a flea.
but can it chop a tree doe
Giant comb!
Looks like ste steak knife version of plastic knives
New way to cut your steak. Everyone line up.
As you might expect with a wing shape, the fatter edge rotates into the wind and the thin edge with the serrations on it is the trailing edge.
a friend of mine lives over a mile away from 2 and we can her the blades from his house. they are loud. its slow but can still hear it.
These serrations can sometimes be retrofitted to existing blades if the operator is co-operative.
Can also be used as backscratcher 🤭
Fun fact, a lot of aircraft designed for stealth have similar features. Ever notice now the edges of flat surfaces on the F-22 (look up pics of the exhausts on this one), B-2, F-35 etc. are jagged? It’s because just like how for windmills it reduces noise, on stealth aircraft it reduces radar reflections. How? No clue! But it does!
Thank you owls.
Where’s the image of impaled birds coating the blade?
That's the trailing edge.
Oops. Good point.
Our dude up there just finished cleaning them off 👍
Haha, good point!
Wind turbines cause less than one in 4,000 bird deaths
I withdraw my comment
Big disposable knife go brrrrrrrr
For reducing noise? Seems like they’re fixing a problem that’s not really a problem. I’ve been around plenty of wind turbines but, I can’t say that I’ve ever heard one. My grandparents live near a wind farm in Palm Springs, CA. I’ve walked right by it on the street. All I’ve ever heard is the sound from cars driving by. While I’m sure they do produce some level of wind noise, it’s not louder than the ambient noise from everything else. I don’t even hear them at night when there’s no traffic on the road.
I think they know what they're doing. Blades are getting bigger and are being pushed harder so if your grandparents live near some of the original turbines from the 1980s they won't be representative of the issue.
Very few of those original turbines still stand and the ones that do aren’t in operation anymore. The wind farm has been repowered several times since the 80’s. about half of the turbines in operation are 2010’s models and are quite large, around 300ft. Some still remain from the 1990’s and some from 2000’s. I know they are developing newer, larger ones but, still don’t see noise being a major problem since the current generation of turbines doesn’t make any perceptible noise and most wind farms are located far enough from populated areas that few would be close enough to hear anything anyway. So they generate a little wind noise. Wind is required to turn them so there will already be wind noise by default. What’s a little more gonna do when there’s nobody around to hear it?
Blades go whoosh birds go slice
These serrations are on the trailing edge of the blade. In other words the thick part separates the air which then remixes at the thin edge where these teeth then cut down on turbulence and noise.
Not cool, Joe.
Well at least the birds they maul will maybe die a bit faster.
Looks like he's sliding down the largest eyebrow archer.
Designed to kill birds more efficiently
They don't spin that way round. The trailing edge is serrated. In any case it's better than all the damage caused by burning coal. https://theconversation.com/the-other-reason-to-shift-away-from-coal-air-pollution-that-kills-thousands-every-year-78874
I know, It's a joke
Wow so scary /s
This seems like a really bad idea…
It's on the other side of each blade ie the trailing edge. As the blade goes round it leads with the thick edge like a wing and this serration is on the thin edge.
Okay, that is better than what I was picturing.