Originally Posted by
IFLY_INDIGO
I am wondering if there is any commercial transport cat airplane in which CG moves forward with fuel consumption ( I admit that would be very silly coz it would increase fuel consumption).. just out of curosity.. ????
Yes there are. It all depends on the fuel layout. Global Express (which is Part 25 Transport Category) has it moving both forward and aft at different times, as the fuel burn is an attempt to maintain a reasonably constant - and hence reasonably aft - cg.
And why do you believe starting aft and moving forward is silly - the behaviour you describe, of starting forward and moving aft is actually worse, since it means that the start of every flight, when you are heaviest, is also furthest forward, and every flight starts heavy while not every flight ends empty, so the "good" part of the fuel burn curve may never happen.
What's important for fuel burn is trying to keep the cg as far aft as possible throughout the flight, consistent with a safe loading.