Mean Piston Speed
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.
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Formula, assumptions, and limits
| Symbol | Meaning | Unit |
|---|---|---|
| Stroke | mm (÷1000 for m) | |
| rpm | rpm | |
| Mean piston speed | m/s |
Source: Pounder's Marine Diesel Engines
In short
Cm = 2\u00b7s\u00b7N/60.