KenV wrote:
And oh yes, if Voyager has no belly tanks, then I don't know how it could possibly mass out before it volumed out.
Do you actually understand the concepts of specific gravity and the effect of temperature on SG? Such factors may be insignificant in some little mini-jet such as an A-4, but they are highly significant in large aircraft such as the A330.
Total tank volume in the A330-MRTT is 139000 litre. Assuming you can do sums, you might like to calculate the total mass at different specific gravity values, then adjust that for temperature deviation.
Again, the USAF needed cargo floor and door in the Frankentanker because the B767's normal, somewhat limited underfloor cargo space is further compromised by the center tank plugs needed to meet the AAR requirements of the KC-X competition.