Concorde had 13 fuel tanks, but only four directly fed the engines, so they were constantly moving fuel between tanks. In addition, fuel was used to cool the a

Concorde had 13 fuel tanks, but only four directly fed the engines, so they were constantly moving fuel between tanks. In addition, fuel was used to cool the aircraft structure because it got very hot from supersonic speeds. And fuel was also used to trim the aircraft pitch - if you were a little out, it increased fuel consumption, but if you were a lot out it would be uncontrollable. And of course all the changed constantly as fuel was consumed. So a key part of the flight engineer's role was managing fuel. https://www.heritageconcorde.com/fuelgeneral https://www.heritageconcorde.com/fuelgeneral