[Gooserider]

My understanding of rotor's design is that of a tumbling turbulence - the water 'rolls' accross the bottom of the inverted cone shaped holes that the drill bit has left, up the sides, hitting the ridge, and rolls back down the other side etc. The pins help in removing the head by adding extra surface area? The rolling allows more water molecules to touch the surface of the copper and adsorb the energy.

You could be right, but that isn't my understanding...

I believe it works because as the water flows down each little channel between the pins it collides with the water coming down the cross channels, creating major turbulence at each intersection point. The conical hole bottoms are actually a bit of a mixed bag if I remember some of the stuff I've read. A flat bottom hole (such as you'd get with an end mill) is slightly better in theory, but the difference is so small it isn't worth while to worry about, especially given how much harder it is to get a clean hole w/ a mill bit (they tend to wander)

Maybe #Rotor can clarify for us.

Gooserider