// multi-utility computation suite · offline · instant · precise
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eng.propeller-thrust-power Calculator
Calculates propeller thrust, power, and efficiency from thrust coefficient, power coefficient, and advance ratio. The J-curve (advance ratio) vs. efficiency shows the optimal operating point for a fixed-pitch propeller.
Inputs
Diameter M
Distance across a circle through its centre. Always confirm units match the rest of the calculation.
Pitch M
Reference formula or conversion factor shown for context.
Rpm
Rate of movement. 1 m/s = 3.6 km/h = 2.237 mph.
Advance Coeff J
Reference formula or conversion factor shown for context.
Kt
Reference formula or conversion factor shown for context.
Kq
Rotational force (N·m) = force × perpendicular lever arm. Engine torque peaks at lower RPM; horsepower peaks higher.
Results
thrust T (kN)
Forward propulsive force generated by the engine or motor. Net thrust = gross thrust minus inlet momentum drag.
shaft power P_D (kW)
Reference formula or conversion factor shown for context.
propulsive efficiency η
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%.
T = Kt·ρ·n²·D⁴
Sample size or count used in the calculation.
Q = Kq·ρ·n²·D⁵
Sample size or count used in the calculation.
pitch ratio P/D
The proportional relationship between two quantities.