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Model engine classes

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In the world of model airplanes there are several engine competition classes to signify engine displacement capacity.

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' 0.152 - 0.300 2.500 - 4.916
'C' 0.301 - 0.650 4.932 - 10.65

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