devin wrote:Source: https://en.wikipedia.org/wiki/Drift_velocity

^We can see halving the conductor length doubles the drift velocity... & doubling the voltage doubles the drift velocity... & and doubling the wire cross section has no effect on drift velocity... behaviors also describing changes to the rotor rpm at no load rpm (halving conductor length doubles no load rpm, and doubling voltage doubles no load rpm, and changing the thickness of the conductor has no effect on no load rpm).

rew wrote:A change from the pattern. Seems you're right.

If you keep the voltage constant, and double the wire (e.g. a second wire), you get twice as much current, giving the same "flow of electrons" in each wire. But I fail to see how this relates to rotor RPM and double the wire thickness. In that case, even though the rotor RPM ALMOST stays the same, the total current will rise "a little", and the drift speed will lower a lot.

There are lots of cases where you can find a "change this, and that other parameter doubles, change that and it still doubles, but change something else and it doesn't, but stays the same". I have a vat of water. Double the water height, and the pressure at the bottom doubles. Double the density of the fluid and the pressure doubles, but double the area of the vat, (keeping the water level the same) the pressure stays the same. So what?

@rew are we 100% sure it's the number of "turns" that determines kv or do you think it may possibly be the drift velocity?