Any sub-light propulsion system which does not eject a stream of matter (or photons) to produce thrust, such as a gravity Polarizer or a thruster.
| Identifier (URI) | Rank |
|---|---|
| dbkwik:resource/F9BEwwRoSK8vZaurZDXKSQ== | 5.88129e-14 |
| dbr:Reactionless_drive | 5.88129e-14 |
| dbkwik:resource/5QbxIkX7UJHjlU3oQ5Ap9A== | 5.88129e-14 |