>> And when I start up the engine of my car, the various parts move far 
>> too fast for the eye to follow. But you *can* see the blur of moving 
>> objects, and there is little doubt that they're moving. ;-)

> Why do you think that those frequencies are far above 50 Hz?

My engine *idles* at several thousand RPM...

> What sound does your motor make? Can you find the base frequency on your 
> keyboard?

Surely that's just the resonant modes of the exhaust system and the chasis?

-- 
http://blog.orphi.me.uk/

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