The main problem I had was it was three stages, and on the launchpad it weighed just shy of 1200tonnes. Half of that was gone by the time the stage was almost empty. The main trouble I\'m having is even though all the rockets on the first stage are the same, have the same amount of fuel etc, the first stage of rockets finish in 3 different times, with the third time having to ditch 3/4 of tanks of fuel. If I post the .craft file will you be willing to have a look at it and give me some pointers?