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Should x21 be a synonym of x121?

If not, when would one use and not in asking a question?

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I think they are different.

When talking about "Weight & Balance", it is more about how an operator / pilot would load up the plane. E.g. how to interpret the charts in the aircraft manual.

When talking about "Center of Gravity", it is more about airplane designs, and the focus is on the theoretical side. E.g. how to place engines such that the center of thrust pass through the center of gravity.

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    $\begingroup$ Isn't cg in design directly related to w&b? For example, when would one use cg and not w&b in asking a question? $\endgroup$
    – user14897
    Sep 27, 2019 at 11:58
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    $\begingroup$ @ymb1 cg --> physics, theory, aircraft designers. W&b --> pilots, dispatchers, manuals. $\endgroup$
    – kevin
    Sep 30, 2019 at 3:16
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I don't see why. the center of gravity is part of the balance part, but it is not the same thing.

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Both are part of the daily lives of the pilots, as a very importany part of preflight preparations is doing w&b calculations to ensure the cg is within permitted limits. In GA the pilot does this, in (bigger) airlines usually dispatch handles crunching the numbers and PIC checks them as he, of course, will be solely responsible for the safe operation of the aircraft.

w&b calculations are a method to determine cg. As tags, I'd definitely say that cg is a subcategory of w&b, kind of in the same manner as fixed wing is a subcategory of aircraft.

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