I was just thinking, what is the max speed and acceleration an electric jet could reach if it didn't have to carry any batteries. Imagine a jet flying just a few feet off the ground pulling power from a live and earth strip it is just touching lightly via some conductive pole or even perhaps via an electric arch if that is possible You would still need a massive length to get upto any usable speed but at least the track just becomes two conductive plates The highest thrust jet engine seems to be 500KN for a 7.5T engine, and the max speed a jet has reached seems to be just shy of 1km/s so an electric engine not carrying fuel should surely best this but by how much? Two ideas 1: If very fast speeds can be achieved could it help get things into orbit. I think this would be a no and difficult as you would need to get towards 10km/s 2: Could air planes of the future use such a system and just use their momentum as "fuel" and maybe a small battery pack for small backup etc. - - - Updated - - - would an electric jet going through the sound barrier create much of a sonic boom?