Boosted gravity propulsion drive

Boosted Gravity Propulsion Drive is the boost that is put onto the Covenant vehicles such as the Banshee, the Ghost, the Wraith, the Spectre and the Shadow in Halo 2 and Halo 3. The Boosted Gravity Propulsion Drive boosts the vehicle into the air. Some say that is only the boost, and it is not responsible for the flotation system of the vehicle.

Other suggest that there is a DRIVE made of Boosted Gravity Propulsion that allows the floating movement of the Ghost and some vehicles, but doesn't allow the movement of the Banshee and the Forward movement of the Phantom

This system acquires power from the main engine of the vehicle, and "steals" energy from the weapon systems, allowing for an increase of speed, like the Ghost and the Banshee.

(NOTE: The Banshee uses this system only when "boosting". When normally flying, it uses antigravity pods located on its wings).

The biggest ship that uses the Boosted Gravity Propulsion Drive is the Phantom, that has 4 protectors on the lower part. The Seraph may use another propulsion system.

The Shade has a Boosted Gravity Drive projected by its base.