Thanks Steff... no problem.. I was just curious.. You did a good job in sharing the principles of that info.. and it might stand to reason for certain apps too.. I'm mostly curious in the app it was used..

I'm now wondering how a mechanical "weight-shifter" might alter performance... I mean.. if one is going to simply use the fuel to alter the CG for easier landings.. What if someone came up with a device/design that could drastically shift weight.. and what that open up in manuevers.. 3D type manuevers.. or ... hmm.. what kind of tumbling/flipping/etc.. would be possible?

The top-level pilots flying high-end aerobatic planes do have ways to alter CG for sure... its usually a compartment located in the aft section of the airplane.. and they add weight, or detract weight depending on what type of pattern/competion they're flying.. to get certain performance traits, based on the CG.. hmm... if it was mechanical and in flight it would be like dual-rates... only you'd have adjustable CG.. which is essentially how this thread got started.. only you have to fly a whole tank for adjustment... but what if you could change it at will?? Could someone achieve some very "Mad" 3D stuff??
Theres a bit of expansion of the original concept.