One of the seven types of hypothetical space drives suggested by Marc Millis
of the Breakthrough Propulsion Physics Program
at NASA's Glenn Research Center (see Millis
| Artist's concept of a diametric drive
spacecraft. Credit: Popular Science
A generic version of a 1957 negative
mass propulsion concept, the diametric drive would somehow create an
asymmetric field around itself. The interactions of the positive and negative
field would then, it is conjectured, propel the spacecraft.
| Principle of the diametric drive.
Credit: Popular Science