// multi-utility computation suite · offline · instant · precise
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eng.propeller-thrust-actuator-disk Calculator
Calculates propeller thrust from actuator disk theory using the momentum equation for an ideal propeller disk. Propeller efficiency η = TV / P is maximum at low induced velocity — large diameter, slow-turning propellers (ships, large aircraft) are more efficient than small, fast propellers.
Inputs
P Kw
Rate of energy transfer (W). P = V×I (electrical). P = F×v (mechanical). 1 horsepower ≈ 746 W.
Eta Prop
Useful output divided by total input, as a percentage. 100% is impossible due to losses (heat, friction, resistance).
V Ship M S
Rate of movement. 1 m/s = 3.6 km/h = 2.237 mph.
Rho Kg M3
Mass per unit volume (kg/m³). Water: 1,000. Air: 1.225. Steel: 7,850. Affects buoyancy, flow, and structural loads.
Results
thrust T (kN)
Forward propulsive force generated by the engine or motor. Net thrust = gross thrust minus inlet momentum drag.
estimated propeller diameter D (m)
The computed diameter -- twice the radius.
advance coefficient J
Sample size or count used in the calculation.
thrust coefficient Kt
Forward propulsive force generated by the engine or motor. Net thrust = gross thrust minus inlet momentum drag.
T = η·P / V
Reference formula or conversion factor shown for context.
efficiency guide
Useful output divided by total input, as a percentage. True 100% efficiency is impossible — losses appear as heat. LEDs: 30–50%. Electric motors: 85–97%. Switching supplies: 85–95%.