*Massive* fan (12 inch?)

in Current Mac Hardware edited January 2014
I was looking at the eMac <a href="http://www.apple.com/emac/specs.html"; target="_blank">tech specs</a> page, and noticed the picture on the top right. At first glance, it really reminded me of the kind of a jet engine air intake. Which got me thinking, hypothetically, what if that WAS a huge fan, going very very slowly (say 1 revolution every 6-7 secs)? I'd imagine it'd move plenty of air, and would be really quiet since it's turning so slowly. Thoughts? Would it be feasible?

Perhaps Jobs got the inspiration for the back of the eMac from his <a href="http://maccentral.macworld.com/news/0012/images/gulfstreamV.jpg"; target="_blank">toy...</a> <img src="graemlins/bugeye.gif" border="0" alt="[Skeptical]" />


  • Reply 1 of 7
    I don't get it.
  • Reply 2 of 7
    I'm just wondering about the feasibility of something like that being used, whether or not it would push enough air out and still be slow enough to be virtually silent.
  • Reply 3 of 7
    ebbyebby Posts: 3,110member
    OK, if the blades of the fan are 2-3 inches long, right up to the inside of the case, and very deep, the fan could move lots of air and focus it through the vents. Since the blades are small and deep, there won't be much noise, and the fan can spin at 6-8 rotations per second and be perfectly silent. Well, if it is a quiet motor. Cool idea.

    OOH! If there were a soft LED inside the computer pointing out through the fan blades, that would cast some VERY COOL shadows on the wall.

    [ 08-10-2002: Message edited by: Ebby ]</p>
  • Reply 4 of 7
    Yeah, crazy lights on the wall! That'd make my PeeCee friends wet their pants...

    I have a feeling they would go well with the Flower Power iMacs though... Add some pot and a large, fuel-inefficient van, and you're all set!
  • Reply 5 of 7
    eugeneeugene Posts: 8,254member
    A moderate speed 60 mm fan wants ~3 watts. A huge fan would want a lot more, even if it's rotating very slowly. 1 revolution per 6 seconds is also very, very slow. I magine a fan that huge could sping closer to just under 100 RPM and still remain quite quiet. But why? It creates dimension limitations while not offering a real advantage over having a number of low speed smaller fans.
  • Reply 6 of 7
    True, Eugene. I found that out last night when looking at fans online.

    What are the specs of the fans in the PM G4 (DP1GHz)? RPM, size, etc?
  • Reply 7 of 7
    eugeneeugene Posts: 8,254member
    [quote]Originally posted by MozillaMan:

    <strong>True, Eugene. I found that out last night when looking at fans online.

    What are the specs of the fans in the PM G4 (DP1GHz)? RPM, size, etc?</strong><hr></blockquote>

    The loudest fan by far is the one blowing onto the CPU. I'm using s 5200 RPM Sunon 60x25 mm fan, but the stock fan is 4500 RPM.

    I don't know what the 120 mm fan is rated for, but around 3000 RPM or lower is my guess.
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