If I remember correctly, the MLW depends on wether it's a RR, GE or ER 747.
Tonnes.
The Rolls Royce MLW is 295.7
The General Electrics are 285.7
and the Extended Range ER's are 288.9
Average(ish) empty weights are circa
RR 181.0
GE 181.0
ER 184.0
Plus crew + pantry loads of around 5.0 tonnes
So the maximum fuel tankering option would be in a RR.
Last edited by blow.n.gasket; 22nd Sep 2017 at 15:16.