Table of Energy Storage Traits
| Flywheel purpose, type | k (varies with shape) |
Mass (kg) |
Diameter (cm) |
Angular velocity (rpm) |
Energy stored (MJ) |
Energy stored (kWh) |
|---|---|---|---|---|---|---|
| Small battery | 0.5 | 100 | 60 | 20,000 | 9.8 | 2.7 |
| Regenerative braking in trains | 0.5 | 3000 | 50 | 8,000 | 33.0 | 9.1 |
| Electric power backup | 0.5 | 600 | 50 | 30,000 | 92.0 | 26.0 |
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