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In the world of model aircraft there are several competition classes to signify engine displacement.
| Class | Cubic Inches | Cubic Centimeters |
|---|---|---|
| 1/2A | 0.000 - 0.050 | 0.000 - 0.819 |
| A | 0.051 - 0.1525 | 0.835 - 2.499 |
| B | 0.1526 - 0.300 | 2.500 - 4.916 |
| C | 0.301 - 0.650 | 4.932 - 10.65 |
| FAI | max 1.526 | max 25 |
| Jet |