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 * Low speed flywheels, with typical operating speeds up to 6000 rev/min, have steel rotors and conventional bearings. For example, a flywheel system with steel rotor developed in a collaborative project at CCLRC in the 1980’s had energy storage capacity 2.3 kWh @ 5000 rev/min, and rated power 45kW. (rotor specific energy 5 Wh/kg, specific power 100 W/kg). ref