In the world of model aircraft there are several competition classes to signify engine displacement.
A model aircraft is a small sized unmanned aircraft or, in the case of a scale model, a replica of an existing or imaginary aircraft. Model aircraft are divided into two basic groups: flying and non-flying. Non-flying models are also termed static, display, or shelf models.
Engine displacement is the swept volume of all the pistons inside the cylinders of a reciprocating engine in a single movement from top dead centre (TDC) to bottom dead centre (BDC). It is commonly specified in cubic centimetres, litres (L), or cubic inches (CID). Engine displacement does not include the total volume of the combustion chamber.
| 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 0.1526 | max 25 |
| Jet |
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