ORIGINAL: dick Hanson
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If it weighs zero or almost zero and has very low wing loading - you can take extreme liberties with CG- we have been back past 50% of MAC- and -they are still flyable - you gotta watch em -but they still fly
enough power to overcome weight -easy one -it will fly no matter how badly the designed is bungled.
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First sentence: You are still stating an approximate aft CG limit. All airplanes have their limits for acceptable controllability. A 50% limit means that CG very definitely DOES matter.
Second sentence: If the CG is so far back that the pitch oscillations are too large and/or rapid for a given pilot to correct, it will be a very short flight, even with a 100:1 power to weight ratio.
I think you have destroyed the original purpose of this thread.