Roy Smith wrote:
It's easy to build an electric motor which spins a disk at 10,000 RPM.
It doesn't cost much either... http://shop4.outpost.com/product/3120560/

I'm not sure that 10,000 is enough. Plus, the mass you'd probably be
spinning in a gyro might be greater than a disk. The mechanics of
allowing the gyro to pivot in both roll and pitch, with very little
friction is also not trivial. Finally, you have to do this in a manner
that will withstand environmental abuse, and run for years, reliably,
without killing someone.

The point I was trying to make is that there are often many, many
technical reasons why something is designed the way it is, and why it
might cost what it does. Jay often spouts off on this type of
topic without having adequate background on these types of engineering
issues.


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