Quick-look delivered power from displacement, speed and a ship-type Admiralty coefficient.
Formula
$$ P_D = \frac{\Delta^{2/3} \cdot V^3}{C} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $P_D$ | Delivered power at the propeller | kW | result |
| $\Delta$ | Displacement at design draft | t | hydrostatic curves |
| $V$ | Service speed | kn | design spec |
| $C$ | Admiralty coefficient - tanker/bulker 400–500, container 200–300, Ro-Pax 300–400, cruise 200–280 | - | empirical / sister-ship fit |
$C$ bundles hull form, frictional regime and propulsive efficiency into a single number. Calibrate it on sea-trial data whenever available.
Sources
- Molland, Turnock & Hudson - Ship Resistance and Propulsion (Cambridge).
- Bertram - Practical Ship Hydrodynamics (Elsevier).