Lift-based thrust of a Flettner rotor given rotor size, rotation rate, and relative wind - the Magnus-effect calc used for sizing Rotorsail.
Formula
$$ L = \tfrac{1}{2} \rho_a C_L A V^2 \sin \beta $$Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $\alpha$ | Spin ratio (tip speed / wind) | - | πDn/V |
| $C_L$ | Lift coefficient | - | Magnus coefficient curve |
| $A$ | Projected rotor area | m² | D × H |
Sources
- Norsepower Rotor Sail technical data.