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Why Do Wind Turbines Have Three Blades?

Real Engineering
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There is a lot more to this subject than I have covered in this video, this is just the basics. I have used the Wind Turbine Handbook as my primary reference material, it covers pretty much everything you need to know about wind turbines. If you are studying this subject academically I highly recommend it. You buy it on amazon here: www.amazon.com/Wind-Energy-Handbook-Tony-Burton/dp/0470699752
Follow Real Engineering on facebook at:
facebook.com/realengineering1
My Instagram: instagram.com/brianjamesmcmanus
Thank you to ruvid.net/u-Kristianpont
For allowing me to use his sound record of wind turbines
Stock footage sourced from videoblocks.com
Once again thanks to Bensound.com for the amazing royalty free music. This time I used Bensound - New Dawn
References
[1] Page 340 Wind Energy Handbook - Tony Burton

Published on

 

Apr 22, 2016

real engineeringwind turbinewind farmwind energyearth dayphysicsscienceeducationalengineering

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Comments 1 345
Real Engineering
Real Engineering 2 years ago
I plan to remake this video at some point. It's a really shallow explanation. I simply did not have the skill and experience to make a longer video when this was released. I could crank this video out in a single day now. The subject definitely deserves a more in-depth explanation.
John Boen
John Boen 12 days ago
Was about to say. But, but, but... you didn't explain why...
Kristian Ribchev
Kristian Ribchev 2 months ago
Could you make a video about vertical axis wind generator vs horizontal one?
Victor Gaiva
Victor Gaiva 3 months ago
Would love an update on this
ashish krishna
ashish krishna 5 months ago
You said it!
Sven-Erik Jansson
It's fewer blades not less bladed.
Florian Walter
Florian Walter 9 days ago
Why not investigating zero-blade designs? They should be most cost-efficient.
David Hendriks
David Hendriks 19 days ago
Very awesome to see that the first scene of this video is at the Zaanse Schans in the Netherlands, an area where I grew up nearby. I biked past this view daily for nearly 6 years.
G K
G K 29 days ago
Pathetic, factually incorrect explanation. No maths or science presented to compare the power generated by different numbers and lengths of blades, and the costs to erect and operate each configuration for the design life expectancy. This was NOT real engineering. You should remove the video as it is nonsense.
oiewey
oiewey Month ago
And where is the new explanation? For the sake of the name "Real Engineering" you owe it since 1 year ago.......Don't blow it.
Alfred Brownell
Alfred Brownell Month ago
wouldn't more blades make it faster because of the increased thrust of the wind on the blades?! im so confused
Saskia van Houtert
I like windmills, perhaps more rotational is possible with the upperfront, thanks for explanation
Basharat Awan
Basharat Awan 2 months ago
I might say that this is not the reason as u have mentioned, the reason is solidity factor and others, actually by increasing the more blades we will not simply get the power increase rather the design will become difficult as the factor of axial force coefficient, power coefficient and torque coefficient need a compromise design for getting the max. Power and so on..
Basharat Awan
Basharat Awan 2 months ago
I wish if I could write more but I have exam tomorrow so next time I.A
oscar garcia
oscar garcia 2 months ago
They actually release more C02 into environment in the rebar that is needed to build the concrete foundation. The amount of electricity they produce in the lifetime of the wind turbine is more than the amount of C02 coal or natural gas plants would release for the same amount of electricity . But 5 times more expensive which is passed on to your electric bill . Government Oversite do your job investigate these scam artist who find a way
Fred Schnepel
Fred Schnepel 2 months ago
Because that’s the limit that Liberals can count. Everything after that is free, what!
basant vimal sharma
basant vimal sharma 2 months ago
Three blades is good four bad luck five birds shit and blades stop six scrap metal thieves will dismantle and take it away three frightens everyone.
avada
avada 2 months ago
Well, I saw a different explanation. One blade would be most efficient, but to imbalanced. Two blades, though balance experience some sort of yaw vibration and such mechanical stress. Three blades are the next best efficiency wise so that's what they use three.
Yoshika Kehelpannala
Your explanations are not adequate. They sounds a little.
Speedy O
Speedy O 3 months ago
em wind turbines don't need and are not designed be next to houses so count that out
thebatmanover9000
thebatmanover9000 3 months ago
This technology causes cancer!
sorry not you
sorry not you 3 months ago
explain
Jason Jordan
Jason Jordan 3 months ago
what about smaller turbines for residential use? I live in central Kansas and I see the big ones up close but what design would work best around or on top of my farm house? I've always thought a different design would work better for closer to the ground wind generators. How does say a cylinder or cone shape compare if held in place with magnet bearings instead of traditional bearings? Use gravity to close openings if the speed becomes to great. I live where it's windy more days then not but I don't need a massive generator to power a 2 story farmhouse and a few out buildings.
McIntosh McDrone
McIntosh McDrone 4 months ago
If you have ever wanted to know how fast one of these wind turbines actually stand I made this video and it gives you a very close up look at that ruvid.net/video/video-vuZotgCqrUU.html
Justin M
Justin M 4 months ago
i always figured it was the same reason milking stools only have 3 legs
Him Bike
Him Bike 4 months ago
They have 3 blades to Kill more bald Eagles
Le Typ
Le Typ 4 months ago
Sadly no numbers to back the "conclusions"! so *vid in a nutshell* - more than 3 blades: not cost effective - less than 3 blades: too noisy
Flavius Nita
Flavius Nita 4 months ago
because it is not allowed with decimal point!
Mike Everett
Mike Everett 4 months ago
Good video, but hard to comprehend with that jungle music in the background. Would have liked to hear the upclose noise of the blades but the drum beat drowned it out.
Dragomir Ronilac
Dragomir Ronilac 4 months ago
Rotational speed stability omitted... Shitty explanation
Slashed Nutts
Slashed Nutts 4 months ago
Here is some more modern day garbage. Wind Turbines , Wind Farms? The Kicker is if there is a wind they explode. They only work in a Breeze lol
manila goodmorning
manila goodmorning 4 months ago
was the video changed? i am a fan of this video. something was changed. i don't exactly know what...
Matt Denihan
Matt Denihan 4 months ago
Wow I’ve never seen a turbine explode like that
Tom Meyers
Tom Meyers 4 months ago
Why do illegal aliens have three blades?
Tony Idle
Tony Idle 4 months ago
Surprising then how many two-blade turbines are in use?
Brian newton
Brian newton 4 months ago
I didn't know that I wanted to know this information, until I saw the video pop up. Thanks for sharing.
Edward Haughney
Edward Haughney 4 months ago
Nice presentation. Right to the point.
brensasi
brensasi 4 months ago
These damn things just on Vids give me Anxiety Man...they are so big they freak me out
nomercy0401
nomercy0401 4 months ago
really?
Munich FX
Munich FX 4 months ago
Giants galore Sancho.
Kerry Galway
Kerry Galway 4 months ago
The only part you did not explain is the part where the cost of the manufacturing and the energy used to make are more than the turbine will produce in it's lifetime
RZU 147
RZU 147 4 months ago
Ok? What are you talking about? What your saying makes no sense.
Two_Heads_Talking
Two_Heads_Talking 4 months ago
The V164 is owned and produced by MHI-Vestas not Vestas, which is a separate company from MHI-Vestas with a different product line
T
T 4 months ago
Because they don't have four ?
Bunnie Miller
Bunnie Miller 4 months ago
BTW : the shorter 4 blade design would also help to eliminate any stress (tho not sure why "an even number of blades" creates stress that an odd number of blades doesn't from one blade being higher) caused since it would be that 10% (or whatever) of its blade length lower than the current model thus reducing both the chance of, as well as any effect of, wind speed that may occur due to the difference in height of the blades. All this keeping in mind that there are 2 ways to increase torque...longer "wrenches"...or MORE "short wrenches".
Bunnie Miller
Bunnie Miller 4 months ago
Well explained, but brings a question...what happens to cost, wind noise and power production if the 4 blade design has the blade length reduced by 10-15 percent? And a second also comes to mind reference the brake failure/turning to fast......why couldn't a 4 blade design be equipped with a way of turning two of the blades "backwards" when high winds are expected in order to have the blade spin counter each other, thus stopping their spin no matter HOW strong the wind gets and eliminating the possible damage that can (as seen in your video) happen??
LAURA ANN CHARLOT
LAURA ANN CHARLOT 4 months ago
Thanks! This was very easy to understand. I've always wondered why they don't use more blades, so as to increase the available torque, and thus be able to spin a higher capacity generator. I've never really considered what these machines cost, and that they need to be able to recover that cost in a reasonable amount of time.
I’m boutta E
I’m boutta E 4 months ago
Wind turbines are creepy af
Ed R
Ed R 4 months ago
Don't you know that liberals do everything wrong ? lol
Gazr Gazr
Gazr Gazr 5 months ago
Three leg stool better than four leg stool, two leg stool would not work ,think there is more to it than cost and weight, like balance etc, cheers.
Lord K Glencoe
Lord K Glencoe 5 months ago
This is by far the worst "real engineering" video. Bad maths. Bad science. Bad engineering analysis. I know that you can do better!
Splag Yetsi
Splag Yetsi 5 months ago
Good explanation
agsn
agsn 5 months ago
why not have circular ones with blades only at the edge
Stephen Carpenteri
Stephen Carpenteri 5 months ago
I have been very near turbines for years. They are very loud and disconcerting, making a loud "huffing" sound that is impossible to ignore and very disturbing. They kill thousands of birds that try to fly between the blades. Also, owners of these turbines tell me that they have an electric motor that starts the blades but the amount of electricity generated in a day is not enough to replenish the starter. Not a good idea!
RZU 147
RZU 147 4 months ago
Buildings kill birds. Who could have thought. Birds a dumb. IF they made less then they need WHY IN HELL DO WE BUILD THEM? AND WHY DO WE GET POWER FROM THEM?#!
panlomito
panlomito 5 months ago
Waarom überhaupt windturbines... omwonenden worden helemaal gestoord van het geluid en slagschaduw van de wieken, en de windturbines maken onze energievoorziening onbetrouwbaar en onbetaalbaar voor de consument. Doe mij maar kernenergie!
kingz8ter
kingz8ter 5 months ago
Why not a spiral spring design?
Take a Break
Take a Break 5 months ago
put the wind turbine in your ass lmao.
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