Thread: "1/2a"
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Old Oct 12, 2004, 05:00 PM
50+AirYears is offline
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For purposes of competition, the AMA, and probably the FAI internationally, considers class 1/2 A to run from 0.000 ci to 0.050 ci, class A from 0.051 to 0.200 ci, 0.201 to 0.300 ci as class B, 0.301 to 0.400 as class C, and 0.401 to 0.670 as class D. These divisions are why you used to see things like some mfgs putting out an .049 and an .051, a .19 and a .201 or .21, and the Johnson and Veco companies had a .29 and .31 or.32. When Free flight was the major competitive category, these size splits would allow a flyer to compete in two classes with the same plane by changing engines. The two displacements would have almost exactly the same weight and performance, so the engines could be swapped without any major readjustments.
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