this is basically why I do the analysis, to break it down to simple rules
that will not require me to have to do the c of g calcs each time.

Try this - start at the bottom of the envelope, and pretend that each
corner represents a zero fuel loading. Then add fuel and see where you
end up. Draw that line on the envelope. The inner envelope is defined
as the the most restrictive envelope from all these lines and the
existing envelope. So long as your loading (with fuel) is within this
inner envelope, you'll be ok to zero fuel. (at least w&b wise.

Jose
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