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bobkoure · 07-26-2004, 02:28 PM

Actually, the cut off voltage between useful flow and not is at about 9.25V (this for a 24V fan, remember)
At 9.25V it's definitely louder than a L1A at 7V, but definitely not as loud as a M1A at 12V (so somewhere between 25 and 35 dB). It doesn't get much louder until 11V or so. At 12V it's about the same as the M1A.
It's too loud for me (editorial comment).
It seems to suck/blow plenty of air at 9.25V. Attaching the radiator to the shroud doesn't seem to make much difference (so enough pressure that it isn't an issue pulling air through a 6x6x2 core)
I'd been hoping that these blowers would have the japan servo "silent" blades (sort of a cross between reverse and forward blades with helper blade-lets to help with the transition). They did not.

Anyway, it's a convenient sized package to mount on a coolshroud

and here's a picture of the blades

Note how they're cupped forward.

I'd love to see how a similarly sized package with the reverse/forward blades might do. From the JapanServo brochure it might be the SCBD or E1540 series.

I wonder if JapanServo would be willing to sell these in "quantity one" to a hobbyist...?

07-26-2004, 02:28 PM	#71
bobkoure Cooling Savant Join Date: Feb 2003 Location: USA - Boston area Posts: 798	Actually, the cut off voltage between useful flow and not is at about 9.25V (this for a 24V fan, remember) At 9.25V it's definitely louder than a L1A at 7V, but definitely not as loud as a M1A at 12V (so somewhere between 25 and 35 dB). It doesn't get much louder until 11V or so. At 12V it's about the same as the M1A. It's too loud for me (editorial comment). It seems to suck/blow plenty of air at 9.25V. Attaching the radiator to the shroud doesn't seem to make much difference (so enough pressure that it isn't an issue pulling air through a 6x6x2 core) I'd been hoping that these blowers would have the japan servo "silent" blades (sort of a cross between reverse and forward blades with helper blade-lets to help with the transition). They did not. Anyway, it's a convenient sized package to mount on a coolshroud and here's a picture of the blades Note how they're cupped forward. I'd love to see how a similarly sized package with the reverse/forward blades might do. From the JapanServo brochure it might be the SCBD or E1540 series. I wonder if JapanServo would be willing to sell these in "quantity one" to a hobbyist...?