// multi-utility computation suite · offline · instant · precise
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sci.ship-resistance-Froude-number Calculator
Calculates ship hull resistance using Froude number Fr = V/√(gL) and splits into wave-making, frictional, and form resistance components. Wave-making resistance spikes near hull speed Fr = 0.4 (Fn at which bow wave length equals hull length) — modern displacement hulls operate at Fr < 0.35 for efficiency.
Inputs
L M
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
V Knots
Rate of movement. 1 m/s = 3.6 km/h = 2.237 mph.
Displacement Tonnes
Net position change from start to end — a vector. Different from distance, which is the total path length.
Cb
Reference formula or conversion factor shown for context.
Results
Froude number Fn
Sample size or count used in the calculation.
estimated wave resistance Rw (kN)
Opposition to current flow (Ω). Ohm's Law: V = IR. Lower resistance means more current for the same voltage.
estimated shaft power SHP (kW)
The value at the specified point or condition.
Fn = V/√(gL)
Sample size or count used in the calculation.
resistance breakdown
Opposition to current flow (Ω). Ohm's Law: V = IR. Lower resistance means more current for the same voltage.