Originally Posted by

**beero1000**
Originally Posted by

**Gun Nut**
The videos I saw showed objects "flipping" at very regular intervals. Yet those intervals are indeterminate? Or just too complicated to predict? What, then, keeps them regular?

They are not indeterminate or unpredictable. As long as you know the moments of inertia and the initial rotational velocities you can predict the flipping period by solving Euler's equations.

Maybe you'd know then. Does the flip need to completely occur during a single rotation?

ETA -

Another thing. While the angular momentum of the entire structure remains the same, it looks like the angular momentum of each individual particle of the structure reverses during the flip. It seems that during the flip the total angular momentum around the principle axis of rotation is shifted by 90 degrees and then another 90. But at the midpoint it equals zero.

It would be neat to have a laser at the central axis so the beam flips directions. I wonder if this could be similar to what occurs with pulsars.