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[Official] Gentle Typhoon 2150 Group Buy Thread - Page 223

post #2221 of 2441
Quote:
Originally Posted by nawon72 View Post

I forgot to ask: Do the GT-2150's have any resonance issues like the GT-1850's?

I tried only 4 of my 25 barenones. One of them was unbalanced and I kinda guetto rigged it so it works fine now. Other than that, I have not experienced any noise at all RPM's tested.
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post #2222 of 2441
Quote:
Originally Posted by PepeLapiu View Post
I tried only 4 of my 25 barebones. One of them was unbalanced and I kinda ghetto rigged it so it works fine now. Other than that, I have not experienced any noise at all RPM's tested.

Can you elaborate on the problem, and how you fixed it? Just in case someone else has the same issue.

post #2223 of 2441
Quote:
Originally Posted by PepeLapiu View Post

Quote:
Originally Posted by ehume View Post


12v being pulsed so that the fan is starved for current, runs more slowly. I once ordered a PWM controller kit. When I realized it controlled by pulsing the 12v line, I gave it away instead of assembling it. PWM control as designed for computer use pulses the special 5v line, which causes the fan's PCB to control the speed. The 5v line is not the main power line for the fan. The fan motor and fan PCB get their power from the main 12v line.

I dont get why you seem to think that's a bad thing.

And I'm not sure about slower, the Lamptron Touch gets my GT-2150's spinning between 2100 and 2200 rpm at max .......according to the tach wire anyway. I don't know how accurate that wire is.

Anything that pulses can make noise. I like smooooth.

 

As for resonance issues, I don't test for them. I imagine they will crop up, though, since the fans have the same frame etc. as all the other GT's.

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post #2224 of 2441
Quote:
Originally Posted by nawon72 View Post

Can you elaborate on the problem, and how you fixed it? Just in case someone else has the same issue.

The one fan was vibrating and the vibrations were getting worst with RPM increase. There might be more than one reason why this happens so my trick might not work for everyone every time on every fan. Never the less, I theorized that the vibrations were from the blades being unbalanced.

Here is what I did: for this you would need a very smooth and flat surface. I used a mirror laid flat on my desk. You will also need a fan controller and a Sharpie marker.

Lay the fan down on the mirror with the label facing up.
Turn down the RPM to the slowest you can.
Then start turning up the RPM until the fan starts to vibrate.
Hold the frame down firm against the mirror so only the blades are vibrating but not the frame itself.
Slowly lower the Sharpie down with a very firm and steady hand onto the spinning blades toward the outside near the frame.
Lower the Sharpie so slowly until it barely starts to touch the blades.
Stop your fan.
The Sharpie will have leaf some marks on the blades that are higher then the rest.
So you gently push those blades down while pulling up the opposite blades.
Just a little bit.
Try your fan again and keep repeating until the blades dont shake anymore.
If you have to repeat , make sure to clean the blades between each spin/mark cycle.

I hope that was the only one in the bunch with a problem like that.
Edited by PepeLapiu - 5/8/12 at 11:44pm
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post #2225 of 2441

+ rep for that

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Alpha
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Scythe Mugen 2 two San Ace 9S1212P4M011 PWM fans on Mugen 2 Scythe/Nidec Gentle Typhoon AP-12 800 rpm front... No rear fan 
CoolingCoolingOSMonitor
TY-140 PWM top intake fan  Scythe Kaze Maru 2 1200 rpm Win7 64-bit Dell 1905FP 
KeyboardPowerCaseMouse
Dell RT7D5JTW PS/2 keyboard from 1997 Seasonic X-650 fully modular 80+ Gold NZXT Beta Evo, grills gone Logitech Mouseman Wheel (antique from late 1990's) 
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post #2226 of 2441
Quote:
Originally Posted by ehume View Post
Anything that pulses can make noise. I like smooooth.

As for resonance issues, I don't test for them. I imagine they will crop up, though, since the fans have the same frame etc. as all the other GT's.

I haven't heard of the AP-13, or AP-14 having resonance issues. And although not quite the same, the AP-29 doesn't have any resonance problems. I base this on Martins testing, and that i've heard some people say their GT's (all of them were referring to AP-15 i think) have resonance issues.

 

In case you're confused as to what I meant when i said resonance, I mean the bump in the otherwise straight line for RPM (or CFM)  vs. dB (see this graph).

post #2227 of 2441
Quote:
Originally Posted by threephi View Post

Nope not in yet. Shipment was expected to occur at the end of April, no word yet whether that did indeed happen but I expect we'll be hearing about that soon. And then the estimated time on the cargo ship is one to six weeks before they actually get here.
There's a new thread about the completes: Gentle Typhoon 2150 Completes Arriving Soon - Pay for shipping now!

Thanks for the information. I will definitely check that thread out! Hopefully this time around the process is a bit smoother and faster.
post #2228 of 2441
What opportunities do those of us have to buy GTs? Any more group buys going on? The OP vaguely seems to indicate that it is closed...
post #2229 of 2441
I would also love to get in on some of these if there is ever another buy or anyone who bought some or doesn't need them anymore.
post #2230 of 2441
I'm pretty sure group buys are no longer sanctioned on OCN.
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