Model engine classes

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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 0.1526 max 2.5
Jet
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