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(Quora)   Did you ever wonder why wind turbines have three blades?   (quora.com) divider line
    More: Interesting, Wind turbine, Windmill, turbines, blades  
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1661 clicks; posted to STEM » on 04 May 2022 at 12:20 PM (13 weeks ago)   |   Favorite    |   share:  Share on Twitter share via Email Share on Facebook



37 Comments     (+0 »)
View Voting Results: Smartest and Funniest
 
2022-05-04 8:55:19 AM  
Ah, the wonder of prime numbers.
 
2022-05-04 9:13:42 AM  
Because while you were studying how to beat Bowser, they were studying... Themselves?
 
2022-05-04 9:15:23 AM  
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//goedendag
 
2022-05-04 9:22:57 AM  
Because 3 is the number of the counting?

...or the metric system.
 
2022-05-04 9:27:34 AM  

BenSaw2: Because 3 is the number of the counting?

...or the metric system.


5 is right out!

CSB, in the county where I live, a company put up 150+ wind turbines over the past couple of years.  They finally all went operational late last year.  This spring, something happened to a single transformer and the entire farm of turbines is now inoperative.  The replacement turbine can only be obtained from China and weighs something like 200 tons, and with the current shipping mess that is China, nobody has any idea when the replacement will arrive.  So we have 150+ wind turbine statues to look at
 
2022-05-04 9:39:14 AM  
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2022-05-04 10:04:32 AM  
More surface area to kill more birds. Duh. Four blades would be better but would cause too much cancer. People would notice.
 
2022-05-04 10:11:45 AM  
Why do beanie hats have two blades?

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Is that a beanie on Grandpa's Knob?

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2022-05-04 10:18:58 AM  
No.
 
2022-05-04 10:22:18 AM  
When I used to do TT races, I replaced my front 90mm 12-spoke wheel with one of these. It did help with performance and was more stable when there were some crosswinds.
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2022-05-04 10:40:17 AM  
Que?
aerotrope.comView Full Size
 
2022-05-04 10:58:18 AM  

whyRpeoplesostupid: [Fark user image 821x615]


I saw a news clip several years ago where a company was trying to design smaller versions of those to use in city areas where big turbines couldn't be used.  Never saw anything about it since.  I often wondered if the technology  didn't pan out?  Or did they just give up?
 
2022-05-04 11:40:24 AM  
Very interesting, but the guy really hates whatever he imagines "environmentalists" to be.

Young people need to stop popping their head up the butt of the environmentalists...
 
2022-05-04 12:07:02 PM  

OldRod: whyRpeoplesostupid: [Fark user image 821x615]

I saw a news clip several years ago where a company was trying to design smaller versions of those to use in city areas where big turbines couldn't be used.  Never saw anything about it since.  I often wondered if the technology  didn't pan out?  Or did they just give up?


I think I read that same article. Don't know what happened. But just looking at the setup it seems a lot simpler and would need less maintenance
 
2022-05-04 12:24:57 PM  
Doesn't matter how many blades, still a big fan.
 
2022-05-04 12:26:12 PM  
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2022-05-04 12:30:45 PM  
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1.21 gigawatts
 
2022-05-04 12:38:02 PM  
Closer shave
 
2022-05-04 12:42:22 PM  

Harlee: Ah, the wonder of prime numbers.


Two and five are also prime, but two blades cause serious resonances and five blades is expensive without any real improvement in performance.

DRTA
 
2022-05-04 12:50:34 PM  
I like how it starts out informative with a strong rational bent but by the end he goes completely off the deep end talking about how self-educated people are better trained than professionals and everyone was wrong about COVID.
 
2022-05-04 12:52:35 PM  
It was all going well until he started giving his half-baked "kids these days" opinions.

This is why I keep telling environmentally concerned young people to study the sciences and I mean the hard sciences not the crappy environmental stuff.

What's "the crappy environmental stuff"?


It is really hard for kids to day to realize that this wind turbine I show pictures of here was the father of what you see today.

No, I don't think it is "really hard". It's very obvious.
 
2022-05-04 1:02:19 PM  
Always blowin' on Grandpa's Knob
qph.fs.quoracdn.netView Full Size
 
2022-05-04 1:03:21 PM  

luidprand: I like how it starts out informative with a strong rational bent but by the end he goes completely off the deep end talking about how self-educated people are better trained than professionals and everyone was wrong about COVID.


Indeed. I started reading and thought "interesting", then the strange environmental science hate showed up and I stopped reading there.

Good to know the rest was just cognitive dissonance and I didn't waste more of my time.
 
2022-05-04 1:03:42 PM  
FTA: ..."jerk itself into failure."

I mean who among us HASN'T?
 
2022-05-04 1:35:45 PM  
Sponsored by Mercedes-Benz?

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2022-05-04 1:57:08 PM  
Such a windmill would not become unstable and jerk itself into failure.

This feels like a personal attack.
 
2022-05-04 2:35:48 PM  
Given nearly all my experience with Quora, I'm guessing the answer's wrong, but I'm not willing to give them a click to find out.
 
2022-05-04 2:42:46 PM  
Three phase power.

NEXT!
 
2022-05-04 3:21:40 PM  
Isn't it to symbolize the Father, Son, and Holy Ghost?
 
2022-05-04 3:27:14 PM  

SumoJeb: Always blowin' on Grandpa's Knob
[qph.fs.quoracdn.net image 602x452]


Would Grandpa's Knob ever "become unstable and jerk itself into failure"?
 
2022-05-04 6:48:30 PM  

SumoJeb: Always blowin' on Grandpa's Knob
[qph.fs.quoracdn.net image 602x452]


Actually not too far from my house....
 
2022-05-04 8:00:34 PM  
Wow.  That article both taught me something AND told me to get off somebody's lawn.
 
2022-05-04 9:11:30 PM  

OldRod: I saw a news clip several years ago where a company was trying to design smaller versions of those to use in city areas where big turbines couldn't be used.  Never saw anything about it since.  I often wondered if the technology  didn't pan out?  Or did they just give up?


Wind turbines do very bad things when they fail.  In a high density urban area, that could be very bad.  Also smaller ones produce far less power.  Half the size and you get a quarter of the power.
 
2022-05-04 10:04:19 PM  

OldRod: whyRpeoplesostupid: [Fark user image 821x615]

I saw a news clip several years ago where a company was trying to design smaller versions of those to use in city areas where big turbines couldn't be used.  Never saw anything about it since.  I often wondered if the technology  didn't pan out?  Or did they just give up?


There's a small-ish building in Saint Paul that has a bunch of them on the roof.

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https://www.twincities.com/2011/05/21/st-paul-business-owner-sees-smaller-quieter-wind-turbine-fit-for-a-city/
 
2022-05-04 10:08:14 PM  

OldRod: whyRpeoplesostupid: [Fark user image 821x615]

I saw a news clip several years ago where a company was trying to design smaller versions of those to use in city areas where big turbines couldn't be used.  Never saw anything about it since.  I often wondered if the technology  didn't pan out?  Or did they just give up?


While those designs are nice because they don't need to keep pointed into the wind, they are also less efficient and can have trouble starting and running in lower wind speeds. Mostly because the wind is pushing on both sides of the drum. While it's able to better push one side and make it spin it's still adding drag to the other side. Same goes for basically any of the vertical spinners.
 
2022-05-05 9:27:24 AM  

natazha: Harlee: Ah, the wonder of prime numbers.

Two and five are also prime, but two blades cause serious resonances and five blades is expensive without any real improvement in performance.

DRTA


2 blades cause serious resonances and 5 have more drag

RTA, it was actually pretty interesting
 
2022-05-05 10:00:20 AM  

Snotnose: natazha: Harlee: Ah, the wonder of prime numbers.

Two and five are also prime, but two blades cause serious resonances and five blades is expensive without any real improvement in performance.

DRTA

2 blades cause serious resonances and 5 have more drag

RTA, it was actually pretty interesting


"Four shalt thou not count, neither count thou two, excepting that thou then proceed to three. Five is right out! Once the number three, being the third number, be reached, then lobbest thou thy Holy Hand Grenade of Antioch towards thy foe, who, being naughty in my sight, shall snuff it."
 
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