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eng.wave-resistance-froude Calculator
Calculates ship wave-making resistance from Froude number and hull form coefficients using the Michell integral approach. Wave-making resistance increases as the third to fourth power of speed above the hull speed — this is the principal reason displacement ships are speed-limited.
Inputs
Ship Speed Kn
Rate of movement. 1 m/s = 3.6 km/h = 2.237 mph.
Waterline Length M
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
Displacement Tonnes
Net position change from start to end — a vector. Different from distance, which is the total path length.
Wave Resistance Coeff
Opposition to current flow (Ω). V = IR. Resistors in series add; in parallel their reciprocals add.
Results
Froude number Fn
Sample size or count used in the calculation.
wave resistance Rw (kN)
Opposition to current flow (Ω). Ohm's Law: V = IR. Lower resistance means more current for the same voltage.
wave resistance power (kW)
Opposition to current flow (Ω). Ohm's Law: V = IR. Lower resistance means more current for the same voltage.
wave-making regime
The operating regime — the mode or zone in which the system is currently operating.