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Posted: Fri Dec 15, 2006 6:12 pm
by Robert Gift
Nelso90 wrote:If I'm right, that thunderbolt is putting out a tone of 765Hz. If I did my math right, that means that the rotor is spinning at 9180RPM! :shock: :shock:
Interesting!
Is that not awfully fast RPM.
But what do I know?
How did you figure that?
Posted: Fri Dec 15, 2006 8:50 pm
by Nelso90
Hz/number of portsx60.
So, 765/5x60=9180.
Posted: Sat Dec 16, 2006 12:55 pm
by Robert Gift
I did not know where 765, a flat G-natural, came from.
Is 9180 an unusual motor rpm?
Thanks.
Posted: Sat Dec 16, 2006 11:29 pm
by Nelso90
The motor is a universal motor, the pitch is adjustable. I just opened up Audacity, and matched the pitch.
And yes, 9180RPM is extremely high for a thunderbolt.