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A visual demonstration of Gentle Typhoon bearing performance

post #1 of 10
Thread Starter 

Computer shuts off 1 second into the video.


On the bottom: a ball bearing Delta EFB-series fan. It continues to spin for around 3 seconds after the computer shuts off. It was running at ~1800 RPM before shut-down on 9V.

On the top: a Gentle Typhoon AP-15. It continues to spin for 20 seconds after the computer shuts off. It was running at ~1600 RPM before shut-down on 10.5V.

Also notice the behavior of the fans after they have stopped spinning. The Delta rocks back and forth a few times and then stops completely. The AP-15 is still rocking back and forth even at the end of the video.

(Excuse the noise in the background from my A/C unit).
Edited by 996gt2 - 7/25/11 at 11:56am
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post #2 of 10
Impressive, but what speed is the fan running at?

I remember seeing somewhere a system that can keep fans running for a while after shut down to make sure rads/heat sinks are still cool, was funky
post #3 of 10
Thread Starter 
Quote:
Originally Posted by SgtMunky View Post
Impressive, but what speed is the fan running at?

I remember seeing somewhere a system that can keep fans running for a while after shut down to make sure rads/heat sinks are still cool, was funky
Both fans were powered off as soon as the computer shut off. The spinning just shows how good the bearings are on a GT.

GT was spinning at 1600 RPM prior to shut-down. Delta was running at around 1800 RPM.
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post #4 of 10
impressive might have to get me one lol
   
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post #5 of 10
This is why I'm rockin 6x GT AP-15's.
    
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post #6 of 10
Very cool !(pun intended ) I think you have left a factor out of your demonstration however: Fans have different pitch, meaning that some grab more air per revolution. A fan with higher pitch will slow down faster than one with lower pitch when the power is removed. My guess is that this factor outweighs friction differences in bearing types by a wide margin. Not knocking GTs though, I would love to outfit my rig with some.
    
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post #7 of 10
Thread Starter 
Quote:
Originally Posted by Jagged_Steel View Post
Very cool !(pun intended ) I think you have left a factor out of your demonstration however: Fans have different pitch, meaning that some grab more air per revolution. A fan with higher pitch will slow down faster than one with lower pitch when the power is removed. My guess is that this factor outweighs friction differences in bearing types by a wide margin. Not knocking GTs though, I would love to outfit my rig with some.
If you look at the blade design and pitch on a Delta EFB vs. an AP-15, you'll see that they're actually pretty similar. The EFB has 11 curved blades, whereas the AP-15 has 9. Both fans have similarly shaped blades.

Both fans use ball-bearings, so I thought this would be a more appropriate test than comparing 2 fans with completely different blade shapes and bearing types.

Also, notice that when the Delta fan stops, it rocks back and forth for maybe about 1/2 a second. When the AP-15 stops spinning, it continues to rock back and forth slightly for quite a few seconds. Another testamant to how good the bearings are.


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post #8 of 10
Nice share.. It's a good comparation since both have nearly similar blades
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post #9 of 10
To me they look like they have completely different blade designs. Look at how close the blades are to eachother on the GT compared to the other. Looks like different pitch to me. Also, the "rocking" you are referring to probably has to do with one fan being a stepping motor (rocking motion) and the other being a permanent magnet design (smooth coasting). I still agree that these fans absolutley kick butt, I just think your test doesn't show what you think it does.
Edited by Jagged_Steel - 7/25/11 at 6:19pm
    
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post #10 of 10

Not mine, courtesy CoolingTechnique.com.

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