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Rudder Rate Check (SOLAS II-1 Reg 29)

Rate check: full rudder 35°→30° other side in ≤ 28 s, meaning ≥ 2.32 °/s average. SOLAS fundamental steering-gear duty.

ManoeuvringSOLAS
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Formula, assumptions, and limits

θ˙=65t3530\dot\theta = \frac{65^\circ}{t_{35 \to 30}}
SymbolMeaningUnit
ttMeasured time 35°→30°s
θ˙\dot\thetaAverage rudder rate°/s

Source: SOLAS II-1 Reg 29

In short

Rate check: full rudder 35\u00b0\u219230\u00b0 other side in \u2264 28 s, meaning \u2265 2.

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