You won't see a spinning wheel in there. These things are built with tiny MEMS devices now. See for example:
http://www.starlino.com/imu_guide.html
http://www.analog.com/en/mems/gyroscopes/products/index.html
http://tom.pycke.be/mav/92/kalman-demo-application
http://invensense.com/mems/gyro/tripleaxis.html
Discussion on:
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