Originally Posted by
Cavi Mike
Assuming all other factors being equal, which of these rotors would have the least amount of drag brake effect:
12.0 x 7.25 x 25.3
12.0 x 5.0 x 23.0
Those rotors will have different amounts of magnetic material in them. If the gauss is the same per unit density of the material, then the 12.0 x 7.25 x 25.3 will have less gauss overall and should have less drag brake effect. Use area of a cylinder - area of the smaller cylinder to solve.