Bob Blick wrote:

> On Mon, 07 Mar 2011 12:56 -0500, "Olin Lathrop" wrote:
>> Where to begin.  First 8000 RPM is a frequency.  Second, 133.33 is
>> clearly not a frequency since frequency has units of 1/time.=20
>>=20
>> What you apparently mean is 133Hz.  Pay attention to details.  They
>> matter.
>=20
> I think you are being confusing. Both are frequency, one is "per
> minute" and the other is "per second".=20

My comparative mind saw this as Olin meaning that 133.33 is not a
frequency, it is a dimensionless number, while 133.33 Hz (or 133 Hz,
rounded to a more reasonable precision) /is/ a frequency, approximately
the same as 8000 1/min (which is also a frequency).

No need to bring a rotor or even an engine into this part of the
discussion.

FWIW, using proper units avoids many errors.

Gerhard
--=20
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