[RedDevil]

There is no sound of importance in that video.
Neither is there a trick, motor, spring, inclination or whatnot.

My mother was a professional sewing class teacher and I used to play around with the metal sewing machine thread spools, intrigued by how you can make a spool wind up itself by rolling it over a flat surface while just pulling the end of the wire, and how it would indeed move faster than the wire.

I actually pulled it at an angle because you want the wire pulled tight on the spool.
By increasing and decreasing the angle you could even make it roll back and forth.

If the sine of the angle of the wire is equal to the difference between the spool flanges and the core (like if the direction of the wire if extended to the surface would be right between the flanges) then the spool won't turn either way but be dragged over the table if you pull hard enough.



Green: the spool rolls to the right, rolling up the thread.
Red: the spool rolls to the left, unwinding itself.
Blue: the spool drags over the table neither winding up nor unwinding.

The propeller car is even simpler than this because there's no thread, no spool and no angry mom.