// multi-utility computation suite · offline · instant · precise
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eng.ship-hull-Froude-number Calculator
Calculates ship Froude number from speed and waterline length, and estimates wave-making resistance coefficient. Wave-making resistance increases dramatically as Fn approaches 0.4 — displacement vessels are designed to operate below this hull speed for fuel efficiency.
Inputs
V Knots
Rate of movement. 1 m/s = 3.6 km/h = 2.237 mph.
L Wl M
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
Results
Froude number Fn
Sample size or count used in the calculation.
hull speed (knots)
The computed rate of movement or processing.
speed/length ratio V/√L
The computed linear length.
resistance regime
Opposition to current flow (Ω). Ohm's Law: V = IR. Lower resistance means more current for the same voltage.
Fn = V / √(g·L)
Sample size or count used in the calculation.
hull form recommendation
Suggested action or value based on the computed results and applicable best-practice guidelines.