Terminology
12-07-2002, 03:27 AM
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Terminology
What does 1/2A and 1/8A mean? I know it depicts small planes, but I do not know what the terms mean. What constitutes a 1/2A or a 1/8A plane?
12-07-2002, 03:39 AM
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Terminology
In the early days of model competition, classes of engines were A, B, C and D, referring to under .199 cubic inches, .201 to .300 CI, .301 to .650 CI and over .651 CI respectively.
When the small engine came about in the late 40's and early 50's (K&B infant, Anderson Baby spitfire, etc) the new class was made for under .050 cubic inches called "1/2 A" as to denote the approx. half of the smallest common engine in the "A" class, the .09 like the Ardens and Atoms.
So then:
1/2A = .049 class,
1/4A= .020 class,
1/8A= .010 class.
Thus ends the lesson for today!
Andrew Coholic
When the small engine came about in the late 40's and early 50's (K&B infant, Anderson Baby spitfire, etc) the new class was made for under .050 cubic inches called "1/2 A" as to denote the approx. half of the smallest common engine in the "A" class, the .09 like the Ardens and Atoms.
So then:
1/2A = .049 class,
1/4A= .020 class,
1/8A= .010 class.
Thus ends the lesson for today!
Andrew Coholic
