Electric motor input power to spin a Flettner rotor at the design RPM - 1–3 % of generated thrust energy.
Formula
$$ P = \tfrac{1}{2} \rho_a C_D D H V_t^3 $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $V_t$ | Rotor tip speed | m/s | πDn |
| $D, H$ | Rotor diameter / height | m | maker spec |
Sources
- Norsepower / Anemoi datasheets.