[Amps] Reducing blower CFM and noise

[rlm]

=F0  That will provide plenty of pressure at 1700-rpm, even for the=20
8171's big brother.
cheers

On Apr 11, 2004, at 10:31 AM, kenw2dtc wrote:

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> The pressure drop as well as the noise drop will be exponential.
> However, if a tube with a large anode cooler is used - such as an 8171
> - a 1700-rpm blower will usually do the job, especially for SSB and
> telegraphy.  What is the diameter of the squirrel cage, Ken?
>
> *******Rich, The diameter of the blade is 9.5 inches.
> *******Thanks,
> *******Ken W2DTC
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> On Apr 10, 2004, at 9:13 PM, kenw2dtc wrote:
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>  Hi,
> I have a Dayton pressure blower that puts out 820 CFM with a 3450 RPM
>  1/3 HP  motor.  If I substitute a 1725 RPM 1/4 HP motor will the CFM=20=

> drop
> in
>  half?  Will the roaring sound drop accordingly also?  I hope there is=20=

> a
>  straight formula rather than working with fan diameter and number of=20=

> blades
> etc?
> 73,
> Ken W2DTC
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Rich Measures, AG6K, 805.386.3734.  www.somis.org/