ISO 19030 Performance Indicator
Speed-loss percentage vs reference-period baseline - the ISO 19030 Part 2 hull-and-propeller performance metric.
Speed loss (ISO 19030-2)
4.90%
Formula, assumptions, and limits
$$\text{Speed loss} = \frac{V_\text{baseline} - V_\text{current}}{V_\text{baseline}} \times 100\%$$
ISO 19030 Part 2 - compares normalised (power, sea-state, displacement, wind) speeds. Typical clean-to-fouled gradient is +0.5 %/month on a poorly-performing coating; target ≤ 0.15 %/month on premium AF.
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 |
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