Propeller Torque Coefficient KQ
Non-dimensional torque KQ = Q / (ρ·n²·D⁵). Open-water charts typically tabulate 10·KQ to keep KQ and KT on the same chart scale.
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Formula, assumptions, and limits
| Symbol | Meaning | Unit |
|---|---|---|
| Shaft torque | N·m (input as kN·m) | |
| Sea-water density | kg/m³ | |
| Shaft rev/s | rev/s | |
| Propeller diameter | m | |
| Torque coefficient |
Source: Carlton - Marine Propellers and Propulsion
In short
Non-dimensional torque KQ = Q / (\u03c1\u00b7n\u00b2\u00b7D\u2075).