Ok, here we go. In a rotating mechanism (helicopter rotor), at a state of equilibrium, the rotor consumes a certain amount of energy from the shaft to maintain a constant angular velocity (since there is a measure of resistance present over the span of the rotor). Lets suppose that the moment of inertia from all sources of drag acting on the rotor, transmitted to the shaft at a speed of 600RPM is measured to be 200Nm. If the rotor is made of two blades then each blade will have a moment of 100Nm? Each rotor blade measures 3m from the shaft centre point and has a mass of 80N. Second, assuming that the moment of inertia remains 200Nm for all angular velocities, how long will it take to slow the rotor to 0 RPM? Sorry if its vague, Im engaged in a purely academic design of a helicopter but have become lost in the rotating physics!