The Aurora, using only jet engines with Hydrogen/Oxygen fuel. could Single Stage To Orbit with ease! Add Magnetic Hydrodynamic Drive (MHD) to that along with a Magnetic Field Disruptor (MFD)--not to mention the Froning Warp Drive (FWD)--and the Universe is at your doorstep!
All of this is doable!
Watch the videos:
MAGNETIC FIELD DISRUPTOR
And, everything above is turn of the Century, year 2000, vintage!