// multi-utility computation suite · offline · instant · precise
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eng.ship-speed-hull-resistance Calculator
Calculates ship hull resistance from Froude and Reynolds numbers, wave-making resistance, and friction using the Holtrop-Mennen method. Hull resistance increases dramatically above the hull speed (Fn = 0.4) — displacement vessels typically operate below this threshold.
Inputs
Displacement Tonnes
Net position change from start to end — a vector. Different from distance, which is the total path length.
Waterplane Length M
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
Beam M
Reference formula or conversion factor shown for context.
Speed Knots
Rate of movement. 1 m/s = 3.6 km/h = 2.237 mph.
Results
frictional resistance (kN)
Opposition to current flow (Ω). Ohm's Law: V = IR. Lower resistance means more current for the same voltage.
shaft power estimate (kW)
The value at the specified point or condition.
Froude number Fn
Sample size or count used in the calculation.
resistance type
Opposition to current flow (Ω). Ohm's Law: V = IR. Lower resistance means more current for the same voltage.
ITTC friction coefficient Cf
Sample size or count used in the calculation.
wetted surface (m²)
Reference formula or conversion factor shown for context.