Search found 8 matches

by phconnell
Tue Sep 11, 2007 4:39 pm
Forum: Fans and Control
Topic: How to make a noisy fan quiet
Replies: 9
Views: 3777

Current ribless fans

I don't know how quiet the Arctic Cooling Freezer 64 Pro and its cousins are and do not have any sort of ideal fan out there - only in my head. My observations come from experience in that I had trouble with a lot of fans being far too noisy for the compact PC case I am building - far noisier than t...
by phconnell
Sun Sep 02, 2007 5:22 pm
Forum: Fans and Control
Topic: How to make a noisy fan quiet
Replies: 9
Views: 3777

Practical aspects of remounting a fan

Hi everyone, Interesting question about cutting off two of the ribs. If the fan humm is due to a trailing eddy of the fan blade then each blade would create its own humm. Every time the eddy sweeps over a rib then it creates a pressure distortion blip so the frequency of the humm should be N*RPM/60 ...
by phconnell
Thu Aug 23, 2007 1:32 pm
Forum: Fans and Control
Topic: How to make a noisy fan quiet
Replies: 9
Views: 3777

How to make a noisy fan quiet

As I wrote somewhere else on this site a lot of fan noise comes not so much from the tips (perhaps at very high speed) but from the four ribs attaching the motor to the frame. The problem is that the ribs are too close to the trailing edge of each blade which has an eddy swiping over the ribs, each ...
by phconnell
Thu Aug 23, 2007 1:08 pm
Forum: Newcomers Briefing Room
Topic: Circular shrouded blades? Why Not?
Replies: 5
Views: 2383

quiet fans

As I wrote somewhere else here a lot of fan noise comes not so much from the tips (perhaps at very high speed) but from the four ribs attaching the motor to the frame. The problem is that the ribs are too close to the trailing edge of each blade which has an eddy swiping over the ribs, each blade cr...
by phconnell
Tue Aug 21, 2007 3:58 pm
Forum: System Advice / Troubleshooting
Topic: Replace Power Supply Fan or Buy Fanless PS?
Replies: 6
Views: 6132

A really quiet PSU

There is a problem with most fans that most people have not begun to consider. They are generally too narrow (25 mm) and the rib structure holding the motor is too close to the trailing edge of the fan blades. It is this which produces a lot of fan noise and you can prove it by taking a noisy fan an...
by phconnell
Sat Aug 04, 2007 12:54 pm
Forum: SPCR Article Discussion
Topic: SPCR's Fan Roundup #4: 120mm Fans II
Replies: 49
Views: 37349

120 mm fans

Can you people try another test and for 92 and 80 mm fans as well. First: (1) Take each fan and cut the central hub away from the 4 radial ribs which hold it, and take out the ribs as well. (2) Remount the hub but with new, thinner, ribs which are at least 5mm from the trailing edge of the fan blade...
by phconnell
Wed May 23, 2007 9:26 am
Forum: SPCR Article Discussion
Topic: A New Way of Testing Fan Airflow
Replies: 100
Views: 69077

Fan noise reduction

Can you do another roundup of the fans you tested but this time cut the motor and fan or each from the four ribs connecting it to the frame. Try remounting them on new ribs so that the distance between the ribs and fan tips is 5mm at least. I have tried this and found that one of the main sources of...
by phconnell
Sun Aug 13, 2006 4:03 pm
Forum: User Reviews
Topic: Two fans at 1028RPM - One 12cm and one 13cm dia
Replies: 4
Views: 6870

Its is important to understand that many fans are too loud just beacuse of badly designed support structure. If you want to make a fan more silent cut the motor hub from the ribs holding it and listen to the noise. In the case of Silenx fans the noise is just the air woosh and thats about as silent ...