  In this work we are going to develop a physical model that explains how
propulsion may be developed in a vacuum by the collision of electrons with an
anode. Instead of using principles related to the conservation of only the
mechanical momentum to achieve propulsion, like all the current propulsion
systems do, the present system achieves propulsion by using principles related
to the conservation of the canonical momentum. The complete physical model will
be provided and comparison with preliminary experimental results will be
performed. These results are important since they show that it is possible to
achieve a radical different propulsion system with many advantages.
