Video

 Lectures by Walter Lewin at MIT

Wheel momentum.

The question is how can CID stop gyroscopic precession by rotating it 90% so the thrust is pointing up? If you look closely at the magnet's orbit you can see the rotor magnet being thrown out. We did not change the direction of spin we only rotated CID.

Here we stopped gyroscopic precession by taping the rotor arms in so they can not fly out as in normal operation. The rotor weighs the same as before. So the only change was tapping the arms in.

Here we are running CID at a very high RPM with no gyroscopic pression.