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Admiralty Coefficient Power

Quick-look delivered power from displacement, speed and a ship-type Admiralty coefficient. Useful for early-design sizing, sister-ship benchmarking, and power-limitation sanity checks.

DesignResistance

Inputs

DisplacementtService speedknAdmiralty coefficient C–Tanker / bulker 400–500, containership 200–300, Ro-Pax 300–400, cruise 200–280.

Delivered power

16,158kW

21669 hp

Formula, assumptions, and limits

$$P_D = \frac{\Delta^{2/3} \cdot V^3}{C}$$

Empirical shortcut that works because wave-making resistance roughly scales with Δ²/³ and V³. C bundles hull form, propulsive efficiency and frictional regime into one number - calibrate it on sea-trial data if available.

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