// multi-utility computation suite · offline · instant · precise
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│ [c] calcalyst_ │
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eng.ship-speed-Froude Calculator
Calculates ship speed in knots from Froude number and waterline length to determine where the ship sits on the resistance curve. The critical Froude number for displacement vessels is approximately 0.35–0.40 — above this, wave resistance increases steeply.
Inputs
V Knots
Rate of movement. 1 m/s = 3.6 km/h = 2.237 mph.
L 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.
Shp Kw
Rate of energy transfer (W). P = V×I (electrical). P = F×v (mechanical). 1 horsepower ≈ 746 W.
Results
Froude number Fr
Sample size or count used in the calculation.
effective horsepower EHP (kW)
Reference formula or conversion factor shown for context.
propulsive coefficient PC
Sample size or count used in the calculation.
Fr = V/√(g·L)
Reference formula or conversion factor shown for context.