Propeller advance coefficient J = V_A / (n·D) - the dimensionless speed on open-water characteristics.
Formula
$$ J = \frac{V_A}{n D}, \quad V_A = V_S (1 - w) $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $V_A$ | Advance velocity | m/s | V_S (1-w) |
| $n$ | Propeller revolutions | rev/s | shaft rpm ÷ 60 |
| $D$ | Propeller diameter | m | prop geometry |
Sources
- Rawson & Tupper Vol 2.