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:
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
[1] Page 340 Wind Energy Handbook - Tony Burton



22 апр 2016

real engineeringwind turbinewind farmwind energyearth dayphysicsscienceeducationalengineering




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Real Engineering
Real Engineering Год назад
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.
ashish krishna
ashish krishna 28 дней назад
You said it!
Michael Brink
Michael Brink 28 дней назад
Not gonna lie I expected you to drop a skillshare promotion here, any time someone talks about learning I brace myself to hear about it.
Кирилл Хацько
Кирилл Хацько Месяц назад
why not talk about vertical turbines?
Birgit Lindh
Birgit Lindh Месяц назад
Real Engineering 2
Ed R
Ed R 29 минут назад
Don't you know that liberals do everything wrong ? lol
Gazr Gazr
Gazr Gazr День назад
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 4 дня назад
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 дней назад
Good explanation
agsn 6 дней назад
why not have circular ones with blades only at the edge
Stephen Carpenteri
Stephen Carpenteri 11 дней назад
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!
panlomito 12 дней назад
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 13 дней назад
Why not a spiral spring design?
Take a Break
Take a Break 14 дней назад
put the wind turbine in your ass lmao.
sagar panchal
sagar panchal 14 дней назад
I think you didnt get the main and major point... Comparison between 2 and 3blades turbine.... Wind speed increases with height and if you use 2 blade turbine then you should have one device to balance blades... This phenomenon doesnt happen in 3 blade turbine.
Shahbaz Khan
Shahbaz Khan 14 дней назад
Does wind have to blow in a specific direction for these to work or the design lends itself to work no matter which way the wind is blowing?
John Mann
John Mann 15 дней назад
Power an entire town... bahahaha!
Jay Dee
Jay Dee 16 дней назад
@2:20 ... You're welcome...!!
Ricardo A. Bastianon
Ricardo A. Bastianon 16 дней назад
En mi libro Energía del Viento y Diseño de Turbinas Eólicas se explica en detalle porqué las turbinas tienen una, dos, tres o más palas con las ventajas e inconvenientes de cada una. bastianon2001@yahoo.com.ar
Anthony Ivanov
Anthony Ivanov 17 дней назад
:D Stfuuuuuuuuuuup
adriaan van harrick
adriaan van harrick 19 дней назад
It just occurred to me, that there is something distinctly off with that theory that 3 blades would help reduce the stresses that occur from one blade getting no wind when it passes the pole, or mast or tower or whatever it is and its name is, at the lowest point of the circle these blades describe, and that the idea that a 3-bladed design would involve a reduction in the distortion of balance (and with that extra vibrations and extra stresses that play onto several parts) simply can't be right. When you think about it, with a 3-blade setup, there are TWO blades getting full wind whilst one gets none each time, so now 2 put up full force against that one blade that produces less our none for a short while, instead of the one active blade that is oriented oppositive of the one that momentarily is inacive each time as it happens in the 2-blade design. The relative stresses are theoretically up to twice as big! I think it would be fair to conclude: 1 it may have got more to do with other variations and effects that might cause vibration, trembling and lack of balance, such as the fact that even over a distance of dozens of meters the force/speed of the wind might vary; 2 it might have got more to do with the actual surface of the blades (seems that although too long blades come with the problem of too high tip speed in up to several hundred kilometers/hour, blades that are constructed in a wider fashion like was done with the old (old-fashioned) wooden windmills, for some reason ALSO again is not favored by designers); 3 to overcome or at least significantly reduce the stress caused by the unbalance coming from one blade putting up no counter force for a short while each time, you would at least need 5 blades, and preferably even seven. In a setup that sports 5 blades, the blade that momentarily stops producing force (and therewith counterweight relative to the other blade or blades) is always accompanied by TWO other blades that ARE ACTIVE AT ITS OWN SIDE (halve if you will) of the axis so a construction like this puts up most of the oppositive forces that out takes to balance the two remaining active blades that are on the other side of the central point of rotation. As opposed to there being two active blades OPPOSITE to it on the axis and NONE on its own side in the 3-blade setup. This however gradually becomes much more difficult to mount to the central axis of the thing, supposedly might be pricier as there is some loss simply related to the scaling difference versus the effective surface created. And, ALL blades have a small part, near where they are mounted, where they catch little or no wind anyway, as the generator housing also blocks the wind
Adrian G
Adrian G 20 дней назад
These statements just don't stack up, i was thinking. Then i saw others' commenting about the same thing. The video should be pulled. Sorry to say it but its a hopeless attempt at explaining the issues. Plus it makes one wonder if the author's other videos are based on fact and actual engineering, and worth anything. This video does him a disservice - it realy shouldn't be up here.
raghavendra babu
raghavendra babu 21 день назад
No useful information. No explanation. Wasted my precious time😔
malcolm nicholls
malcolm nicholls 21 день назад
Well I liked it. Thanks.
jeroen waterschoot
jeroen waterschoot 21 день назад
So they can KILL more birds in one go
Aurobindo Ghosh
Aurobindo Ghosh 22 дня назад
maybe because the three blade setup looks good
tiger TIGER
tiger TIGER 22 дня назад
AstronautK3nny 22 дня назад
Make them lower geared if its too fast with more blades
Shubham MishRA
Shubham MishRA 23 дня назад
You are truly good in explaining contents 👍.
YouSurf 23 дня назад
Wind turbines should be dedicated to either produce hydrogen, to then be shipped and used in fuel cells for clean production of energy when you need it, or should maybe charge Iron Flow batteries where a fleet of trucks could haul them around where the energy is needed cause people should not live NEAR such wind farms. Really.
YouSurf 23 дня назад
the 3 blade safety failed devastatingly due to brake failure... so the sunk cost is now total loss at that point. SO... may be safer and more longevity to have a slower moving 5 blade setup, or 4... may be less chance for brake to fail and if fails, maybe slower rotation will not go outta control unless serious high wind, which one could manually lock it out with a signal sent prior to wind event rather than automatic braking. .
YouSurf 23 дня назад
they have three blades to ensure they produce a subsonic vibration at a frequency that drives people INSANE!!!!!!!!
Ultima Thule
Ultima Thule 24 дня назад
Totally WRONG explanation. This video should be cancelled.
Mike Smith
Mike Smith 25 дней назад
Engineers are dumb and cannot count past 3 I guess....... why 90% are a waste ot time and energy and never balance the energy books. The new cock sucker turbines west of my town sometime go days and not even do one blade revolution, let alone run in 37kph min. wind speed to make any power.
Toastie footsie
Toastie footsie 24 дня назад
did you even watch the video retard?
KnightOfGaea 25 дней назад
Whatever happened to helixical and double helix wind turbines?
Hi Bye
Hi Bye 25 дней назад
I like this Irish guy He’s a smart Irish person Not very Irish
Tahoe Jones
Tahoe Jones 28 дней назад
If you adjusted the angle of the blades, the 'sweet spot' could be a constant. Not rocket science.
Philip Price
Philip Price 29 дней назад
adriaan van harrick
adriaan van harrick 29 дней назад
tho in real life you for sure hear the blades woosh by when you are near such a giant wind turbine, the recording we get to hear here only contains audible sound from the gear box inside, that steps up the amount of rotations before it drives the generator, and that can be very loud (in these monster size mills)
William J.
William J. Месяц назад
Why do chicken coups have two doors? If they had four doors, they’d be chicken sedans! I’ll show myself out.....
Flambo One
Flambo One Месяц назад
Because they do not want copy the Dutch. And also four is one too many.
Chet Chamberlain
Chet Chamberlain Месяц назад
I thought additional blades would be better. The explanation for 4 blades not being cost efficient was quite shallow. If we’re making 12 blades, it would be cheaper to only make and anchor 3 bases rather than 4 bases. Obviously there’s more to it.
Ug0tmi1k Месяц назад
Civil engineering student here. Once tested different turbine configurations with different NACA airfoil shapes for a class. I was always taught that 4 blades would give you more power than a 3 blade turbine, but only marginally. Adding an extra blade at that size means you're adding on a huge amount of mass, so the extra energy produced is surprisingly small. Thus, if you did a simple cost-benefit analysis, you'd see that the cost of adding a single blade, which is massive, is not warranted by the amount of energy produced in the turbine's lifespan. Two blades, if I recall correctly, had a very high rate of failure. Thus three blades was the Goldilocks of all designs Also, the video mentioned "centrifugal force", and I'd always been under the impression that there was no such thing. I remember being told there's centripetal force, but centrifugal force was something that non-physics people made up. Was I the only one taught this? Is this notion wrong?
wanderley apparecido Vieira
wanderley apparecido Vieira Месяц назад
More blades more drag,need more wind speed ,so more power to move it .
Gabriel Freitas
Gabriel Freitas Месяц назад
avfuels Месяц назад
Why Do Wind Turbines Have Three Blades? To kill more birds.
Rajat Poonia
Rajat Poonia Месяц назад
I have better reason for this , net centrifugal force of two blades cancel out the centrifugal force of third blade
赵是 Месяц назад
You keep doing videos informative like this your channel goes down toilet.
paulla smith
paulla smith Месяц назад
One bladed fans are all that's needed. It just wobbles at high speed.
paulla smith
paulla smith Месяц назад
To determine what high speed is; install a stationary arm about 5 foot length perpendicular to the support post, near the top. Tie an eight foot long rope around the far end of the extended arm, and tie a large bell to the other end of the rope and let it hang there. If the bell begins ringing , the speed for the one blader is too fast.
Mohna Khan
Mohna Khan Месяц назад
Very Poor & Unmathematical Explanation 😡😡😡😡 You really raped the topic...
Michael Nablo
Michael Nablo Месяц назад
Coz it's not two😎
Astig Naepal
Astig Naepal Месяц назад
what is all these stats that says these wind turbines are a scam?
John Campbell
John Campbell Месяц назад
3 is a magic number in physics. 3 phase wiring is the most efficient way to transmit power. 3 phase motors are self starting. 2 phase motors would not be self starting. 4 phase wiring would just be too expensive for copper costs.
Bartok Loky
Bartok Loky Месяц назад
pseudo-scientific bullshit , the only reason is econometric. cost vs efficiency. the optimal value is currently at 3 blades. the gain you get from adding one more blade decreases with the number of blades, while the extra cost is generally the same.
Paul Keith
Paul Keith Месяц назад
Because they are very expensive- and three is the minimum to run effectively. Five blades would be more efficient- but would substantially increase manufacturing and maintenance costs. All successful concepts are an amalgam of engineering efficiency and cost.
Ali Z Syed
Ali Z Syed Месяц назад
wait, then why do plane propellers have two blades
Honestmicky Месяц назад
Excellent video, thanks for posting, much appreciated : )
Casey Klahn
Casey Klahn Месяц назад
Proponents of wind power think nothing of cost efficiency. If they did, they wouldn't put the money into wind, they'd put it onto hydro-electric or shale oil. It took me a while to find the data, but it turns out that all of the expensive wind systems in the Central Washington and Columbia Gorge areas, if finally implemented in full, would equal the output of one hydro electric generator (Grand Coulee Dam has 33). "Wind" is an enviro overreach, but who cares as long as we make renewables mandatory (except hydro, the best one...because: liberal!) ? Oh, I figured out how to solve global warming. Implement Marx in total. Peace/ out.
R Rad
R Rad Месяц назад
Wow! Great analysis!
Truth To Power
Truth To Power Месяц назад
Big energy is running a big smear campaign on wind energy. Like the campaign they ran to protect leaded gas. Trillions of infrastructure will be stranded. USA USA USA! 🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸
Joran Heij
Joran Heij Месяц назад
please say 2:22 is not in the dutch xD
fjandgoob Месяц назад
the use of only 3 blades is an economical issue as 4 blades would put a windmill at a MORE COSTLY endeavor, only to be passed to the taxpayer.
Dennis Месяц назад
Free advertising for Mercedes?
Korisniknovi Месяц назад
So, essentially, you're making this stuff up as you go along, right? interestingengineering.com/the-scientific-reason-why-wind-turbines-have-3-blades Literally the first result when one googles "Why Do Wind Turbines Have Three Blades" and completely the opposite of your explanation.
thearchitect27 Месяц назад
How about the concept of strength versus stability as applied to the three-bladed wind turbine system? Don't three blades make the wind turbine that much more effective against the heavy wind loads, which can be quite destructive, as depicted at the end of your clip? Thanks mate! Happy 2019!
daffidavit Месяц назад
For the same reasons, some single engine airplanes have three blades instead of two. Two blades are more efficient. But three blades are shorter to produce a similar amount of thrust. BTW, I understand from a man whose company uses drones to inspect cracks in the windmill blades that each blade costs about one million per blade.
Marie BCFHS Месяц назад
also 3 blades look more elegant
Christopher Van
Christopher Van Месяц назад
So that they can kill the maximum number of birds.
Random autist
Random autist Месяц назад
infinite energy source idea: what if we build a bigass wind turbine that powers a giant ass wind generator that blows at the turbine?
nahmanini sithole
nahmanini sithole Месяц назад
The three blade design is obviously to smack the most birds.
vladimir ikic
vladimir ikic Месяц назад
Because 2 wouldnt work and 3 is most cheap to work. And modern turbines are massivly expensive. So that's why 3?
korelly Месяц назад
I read somewhere that the power of the wind turbine does not depend on the number of blades, but on the surface covered by the blades. That would explain why more blades does not mean more power.
clockwork org
clockwork org 2 месяца назад
The real question is .. why do I have 2 balls ?
Alan Strong
Alan Strong 2 месяца назад
Would be delighted to have a residential version of that.
Keith Lauder Jr
Keith Lauder Jr 2 месяца назад
Wind Power = Idiot Power Modern turbines will never replace power and resources it took to create. Big Scam
Nathan Frey
Nathan Frey 2 месяца назад
Why do they have 3 blades? Is it because they have more than 2 and less than 4?
ECduzitgood 2 месяца назад
These wind turbines are not the best way to harness the wind. They are an eyesore that kills birds in normal operation and possibly humans when the wind speed is to high (as shown during the catastrophic failure at the end of the video. The safer savonius turbine is the direction the wind to energy folks need to go. ruvid.net/video/видео-qeRwmI1gLhI.html Bird apocalypse ruvid.net/video/видео-dsGiaSOaq9o.html
fun time
fun time 2 месяца назад
vtrevlyn39 2 месяца назад
what about 2.5 blades?
Sanjay Matsuda
Sanjay Matsuda 2 месяца назад
0:57 You can't have "less" blades. Perhaps you'd want fewer.
Eli Wesley
Eli Wesley 3 месяца назад
Wind turbines, environmentally friendly?
Frank James
Frank James 3 месяца назад
you eliminated 4 blade because of cost of the blade yet you said the 2 blade was too fast, which isn't a issue of blades but only wind speed .. yet the more wind speed the better IF the windmill was designed and created properly
The Comedy Butchers
The Comedy Butchers 3 месяца назад
Short answer: 3 blades are the most cost efficient and safest
Kenn Hepner
Kenn Hepner 3 месяца назад
The force that destroyed the blades may have been excessive tip velocity, resulting in the tip of the blade passing Mach 1 and being shaken by the vibration that the early jet test pilots encountered. If it happened so quickly, that the disintegrating machine sound drowned out the sonic boom, you might not think of it. Tip speed is a critical factor in determining maximum RPM of a aircraft engine.
___ X
___ X 3 месяца назад
With 2 blades you can't kill as many birds.
Borys Voronkov
Borys Voronkov 3 месяца назад
Just look and learn much more about it from Avasva .
Tippersnore 3 месяца назад
Harry Speakup
Harry Speakup 3 месяца назад
Why do Irish lumberjacks always have tree fellas.
Doug Selsam
Doug Selsam 3 месяца назад
Another aspect of the explanation is 3 blades counteract EACH OTHER during changes in yaw (yaw = directional aim for the entire rotor), whereas 2 blades transmit the forces resulting from changing directions to the bearings, tower, etc. A two-bladed rotor changes direction easily when vertical, and hard when horizontal. Old-timers call the resulting percussive hammering "yaw judders" or "chopping around the corner". That's why 3 blades run smooth, while 2 blades will shake the machine apart. And the reason you only need a few slender blades, rather than filling the whole circle with blades, is they go so fast that it doesn't take very much blade to extract all the available power from the airstream.. Many attempts at two-bladed turbines use teetering hubs with the rotor downwind of the tower, to decouple the yaw judders from the bearings, have been tried, but few, if any, have proven to be a good solution. As the video points out, two-bladers go just a bit too fast for effective noise control. Because two-bladers go too fast AND shake themselves apart, the extra speed makes the shaking that much worse. When you want machinery to last many years, smooth operation is key.
SeanPlaysGames 4 месяца назад
Ones I found a wind tirbind with two blades
barão do metal
barão do metal 4 месяца назад
O bagulho é um boi
Makan Tayebi
Makan Tayebi 4 месяца назад
Not convinced. What made 3 to be the Goldilocks number.
Luke Hartley
Luke Hartley 4 месяца назад
Didn't really explain why you get diminishing returns with more and more blades, you just said long story short 4 blades is worse
David Garcia
David Garcia 4 месяца назад
Please remake this video with more information, you should also include monoblades turbines. I love your videos
stapme 4 месяца назад
It allows them to kill more birds. They are blight upon the landscape.
engfirm 4 месяца назад
To sum up, we choose a 3blade engine in order to have less noise, max torque (power) at short rpm, and the smaller cost, at The same time, am i right???
xwind1970 4 месяца назад
In 2005 I flew over central Italy at 1000ft with a microlight and saw Single blade wind turbines with a counterweight. Any idea why these concepts never made it? They must be cheaper to produce and to maintain?
That one
That one 4 месяца назад
Google why u translating titles?
BIGBOY7 XDFUNNYXD 4 месяца назад
0:19 one of the turbines is white
Joop Dresscher
Joop Dresscher 4 месяца назад
waarom windturbines drie bladen hebben is interesant theoreticly 1 blad performs best but the devil is in the detail probably pretty well outengineerd nowadays :-P
alexandru dumitru
alexandru dumitru 4 месяца назад
why not 3 and a half?
Superteoo gaming DE
Superteoo gaming DE 4 месяца назад
is this Terroriser?
Tim Khan
Tim Khan 4 месяца назад
Because it's much cheaper than 4 blades and more efficient than 2 blades
Rajesh Singh
Rajesh Singh 4 месяца назад
They have three blades because three is the lowest even number.
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