airbreathing electric nitrogen plasma rocket

electric engine that breathes in air 

and energizes nitrogen in air so that nitrogen becomes plasma 

plasma is used to thrust rocket upwards 

electric engine gets energy from land based laser 

to skip need of batteries or nuclear reactor inside rocket 

 

airbreathing electric plasma rocket breathes in air while in flight in atmosphere and stores nitrogen onboard rocket to use nitrogen as fuel for plasma thrust while in space

electric plasma rocket is used to carry components to space to build space based solar cells that are used to power lasers that streams energy into electric plasma rockets if it's to cloudy for land based laser to reach rocket 

weight of regular fuel rocket is 85% fuel weight 

which means an airbreathing electric plasma rocket would weigh 85% less than a fuel rocket on launch, 

but weight of airbreathing electric plasma rocket would increase while in flight in atmosphere since it breathes in air and stores nitrogen onboard for later use as fuel in space 

maybe rocket could have travel forwards instead of upwards 

for a while in order to reach a sufficiently high speed 

and when high speed is achieved 

then rocket collects nitrogen from air 

which it stores for spaceflight

and then the rocket could travel upwards towards space