I received the mine !
Well, it does not work as I supposed.
And I don't understand yet how it works exactly. There is vibration in the top and I still believe that vibration makes it work, but I don't understand in which way.
Some observations:
- The top
does not walk backwards as I believed, at the countrary, it consistently walk in the direction it should, given the spin direction.
So the vibration does not reverse the walk direction. At least not in this top. But I suppose that all the tops of this kind behave in a similar way.
- When the top is spun, the motor starts going, and, slowly, the shell/tip spins faster and faster, in the same direction it was spun, (clockwise), until reaching a permanent stable speed. It seems that the top could spin until there is electricity.
- The top does not work counterclockwise. If spun counterclockwise, the motor starts going normally, but the top vibrates a lot, moves irregularly, never accelerates, decelerates instead, until stopping, in no more than maybe 30 seconds. At times, the top walks backwards; there is counterclockwise spin and counterclockwise precession, but the stem is tilted towards the outside of the precession circle, so there is backwards walking, certainly due to the vibration.
- The motor changes speed by the time, it goes slowly if the top spins slowly, and it goes faster and faster as the top accelerates. It seems like the motor tries to synchronize its speed with that of the top, in some way.
- Spin direction and precession direction are the same. So maybe the top rises like normal tops. Sometimes, not always, when it is very tilted, the top vibrates a lot, then it rises, maybe the vibration helps the rise.
- The vibrating motor is little and placed very near to the tip.