Rolls-Royce Merlin
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| Dash
number |
Application | HP | RPM | ALT | Notes |
|---|---|---|---|---|---|
| I | Battle I | 1030 | 3000 | 16250 | Ramp head / Two-piece |
| 55 | Spitfire V
Spitfire III |
1470 | 3000 | 9250 | |
| 55M | Spitfire L.F. V
Spitfire L.F II |
1585 | 3000 | 9250 | Cropped supercharger impeller |