According to calculations by NASA, a emdrive motor powered by a portable nuclear generator 2 megawatts allow a spacecraft to reach Mars in just 70 days. Being less ambitious, a drive of this type with only 6 kilowatts (obtained by solar panels) generate the momentum needed to maintain a geostationary satellite in orbit indefinitely and reduce the burden that current rockets need to put in orbit 3 tons only 1 ,3.
If successful emdrive perfect the engine to provide even more propulsion power, this engine could be the starting point for the warp able to bend space-time to travel faster than light engines. Then for the construction of our interstellar explorers drones it will require also develop this engine on a smaller scale without losing efficiency propulsion.