A prototype physics drive system, the G2 utilizes the manipulation of micro black holes to practically amplify gravity's effects within a set range. It is powered by ultra-high intensity laser emitters that form a small, controllable black hole within the generator. Unfortunately this technology is not scaleable, as the black holes need be small enough to be stable, otherwise catastrophe would ensue.
1 - I'm aware of the actual energy requirements for such a device.
A G2 as seen on the [I-4 Gravity], used for manipulation of the legs.