Required hydraulic torque on the rudder stock to satisfy the SOLAS II-1 Reg 29 duty: full rudder 35°→35° in ≤ 28 s at service speed.
Formula
$$ T = F \cdot r, \quad P = T \cdot \dot\theta, \quad \dot\theta = \tfrac{70}{t_\text{28}} $$Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $F$ | Peak side force on rudder | kN | DNV-ST-0285 or test |
| $r$ | Moment arm to stock centreline | m | rudder geometry |
| $T$ | Stock torque | kN·m | result |
| $\dot\theta$ | Angular rate (70°/t_28) | °/s | SOLAS |
Sources
- SOLAS II-1 Reg 29.
- DNV-ST-0285 - Steering gear.