You can cut out the louvers themselves on the air intake. This does reduce
the fan noise some. I did that and also added a 100 ohm resistor in series
with the fan motor to slow it down some. This worked well and still
provided adequate cooling.
Carl Moreschi N4PY
121 Little Bell Drive
Hays, NC 28635
----- Original Message -----
From: "Jerry Volpe" <email@example.com>
Sent: Thursday, July 27, 2006 9:37 AM
Subject: [TenTec] Modifying Centaur air intake to reduce air noise?
> I wonder if anyone has successfully reduced the Centaur's noisy cooling
> system through modifications to the actual case. It seems to me that the
> slotted 'louver' design itself produces a siren effect due to the high
> velocity of air being sucked past the horizontal slots (a friend
> reminded me of the mechanics of how sirens work and the similarity to
> the Centaur louver air feed). I have been considering removing this
> entire section of top and bottom case and placing a safety round wire
> fan grill over the top.... or even just leaving it open all together....
> perhaps inserting a chimney (pvc) through the case right up to the fan
> itself to minimize all hard edges. Anyway, before attempting a physical
> mod as dramatic as this I was wondering if anyone else had attempted
> this and what were your results? I think I recall someone 'bending the
> existing slots to minimize their apparent surface area, but I think
> removing them altogether would be a far better approach? Thoughts on this?
> Jerry, KG6TT
> Fairfield, CA
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