Cm = 2·s·N/60. Slow-speed engines 7–9 m/s; medium-speed 9–11 m/s; high-speed 12–16 m/s. Ring-reliability ceiling ≈ 10 m/s.
Formula
$$ C_m = \frac{2 \cdot s \cdot N}{60} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $s$ | Stroke | mm (÷1000 for m) | engine spec |
| $N$ | rpm | rpm | tachometer |
| $C_m$ | Mean piston speed | m/s | result |
Sources
- Pounder’s Marine Diesel Engines.