Speed-loss percentage vs reference-period baseline - the ISO 19030 Part 2 hull-and-propeller performance metric.
Formula
$$ \text{Speed loss} = \frac{V_\text{baseline} - V_\text{current}}{V_\text{baseline}} \times 100\% $$Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $V_\text{baseline}$ | Reference-period normalised speed | kn | sea-trial benchmark |
| $V_\text{current}$ | Current normalised speed | kn | noon report + corrections |
Sources
- ISO 19030 - Hull and propeller performance.