Hello, I would like to know the amount of torque required when the flywheel starts? I know that once at speed the flywheel doesn't require torque. I would also like to know what size of slip ring induction motor to run as the below mentioned speed. The weight of the flywheel is= 6500 kg ( wt. shaft, flywheel boss and wall 2700 kg + mass 3800 kg = total 6500 kg ) RPM= 1550 Diameter=2200mm Thanks for your help.