Mixed Up!

[Robert Gift]

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?

[Nelso90]

Hz/number of portsx60.
So, 765/5x60=9180.

[Robert Gift]

I did not know where 765, a flat G-natural, came from.

Is 9180 an unusual motor rpm?

Thanks.

[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.