Non-dimensional thrust KT = T / (ρ·n²·D⁴). The vertical-axis quantity read from open-water propeller charts.
Formula
$$ K_T = \frac{T}{\rho \cdot n^2 \cdot D^4} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $T$ | Thrust | N (input as kN) | propeller trial / thrust meter |
| $ρ$ | Sea-water density | kg/m³ | 1025 |
| $n$ | Shaft revolutions per second | rev/s | rpm/60 |
| $D$ | Propeller diameter | m | drawing |
| $KT$ | Thrust coefficient | - | result |
Sources
- Carlton - Marine Propellers and Propulsion.