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Why don't they make fans out of metal? - Page 4

post #31 of 45
Ever hear the sound metal makes when air is rushing over it rapidly? Its not pleasant. I work on airplanes and the electrical systems we have all use forced air flow cooling (terrible design, most of the gear is VERY susceptible to overheating, especially on warmer days) and they use anywhere from 1800rpm 80mm fans to 10,000 rpm 80mm fans & 8,000rpm 120mm fans. You have the loud air whoosh noise and a slight metal whine. Another serious drawback of all metal which I notice more and more at work, is the HUGE motor required to turn the not very large in size or quantity fan blades. That dead zone where the motor is is *MUCH* larger than on a normal plastic fan.

I suppose I should also note that all of the fans on our plane happen to be metal frame with metal blades.
    
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post #32 of 45
Common... YOU'VE NEVER hit one of your fans while it was on??

I mean... even the plastic 120mm hurt kind of.... think of METAL fan BLADES.


I don't want to think about it... and yes I know you can by metal things to block you from hitting the fan whatever those are called.
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post #33 of 45
Quote:
Originally Posted by Xaero252 View Post
Ever hear the sound metal makes when air is rushing over it rapidly? Its not pleasant. I work on airplanes and the electrical systems we have all use forced air flow cooling (terrible design, most of the gear is VERY susceptible to overheating, especially on warmer days) and they use anywhere from 1800rpm 80mm fans to 10,000 rpm 80mm fans & 8,000rpm 120mm fans. You have the loud air whoosh noise and a slight metal whine. Another serious drawback of all metal which I notice more and more at work, is the HUGE motor required to turn the not very large in size or quantity fan blades. That dead zone where the motor is is *MUCH* larger than on a normal plastic fan.

I suppose I should also note that all of the fans on our plane happen to be metal frame with metal blades.
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post #34 of 45
Quote:
Originally Posted by Kirus2012 View Post
Common... YOU'VE NEVER hit one of your fans while it was on??

I mean... even the plastic 120mm hurt kind of.... think of METAL fan BLADES.


I don't want to think about it... and yes I know you can by metal things to block you from hitting the fan whatever those are called.
Grills... O.o
post #35 of 45
Quote:
Originally Posted by Rowey View Post
Grills... O.o
They're called "finger guards" in the catalogs. Gee - I wonder why?
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post #36 of 45
hey ehume hows the performance of that metal fan? does it perform any better than the usual array of fans?

lol @ the fans and blowers 10k rpm lol
   
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post #37 of 45
Frankly? Safety precautions. People have found that even spinning plastic fans at high enough speeds can hurt you pretty badly.
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post #38 of 45
Quote:
Originally Posted by Quantum Reality View Post
Frankly? Safety precautions. People have found that even spinning plastic fans at high enough speeds can hurt you pretty badly.

I used to say that fingerguards were for girlie men and then, in just a second of not paying attention, this happened...

The picture was taken after I pushed the nail back down onto the flesh on my finger. The blade caught the nail and lifted it right off my finger almost half way through.



Now all my fans run fingerguards on them, even my weakest fan has a fingerguard on it...
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post #39 of 45
ow, with a metal fan there would be no nail, and the intactness finger would be questionable. however if it has finger guards, think it might be worth it
   
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post #40 of 45
I wish Dyson made a bladeless fan for a heatsink.
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