Covenant starships use Repulsor Engines for propulsion in space. Little is known about its mechanisms, other than that they produce quantum fluctuations that can affect personnel within range of them, and that leave a wake that can affect starships. It's possible that Repulsor Engines could be a form of "reactionless drive" that makes use of negative matter. Negative matter would have negative mass and would have a "repulsive" effect with the normal matter if placed behind the ship.
A Repulsor is an electronic device which uses particle beam technology to project a blast of concussive energy. Repulsor blasts may be directed by magnets and focused by electrostatic lenses, although they may also be self-focusing. One of the luminaries of repulsor design technology is Anthony Stark, who has incorporated them into every iteration of his patented Iron Man armors. Constructed using micro-circuitry, these repulsors are implemented into the palms of his battlesuit and are one of the armor's primary offensive tools.
(See Also: Anthony Stark; Iron Man Armor)
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The repulsorlift or repulsorlift engine, often referred to simply as a repulsor, was an anti-gravity technology capable of levitating an object. It was created from subnuclear "knots" of space-time made by enormous unmanned power refineries encompassing black holes. Repulsorlifts were widely used, and were included on virtually every type of vehicle.
Repulsorlifts only worked within a gravity well, as the technology required mass to push against. For a typical habitable planet such as Alderaan, "antigrav range" was approximately six planetary diameters, or around seventy-five thousand kilometers. Repulsorlifts used minimal power and were reliable enough to be utilized continuously.
Repulsorlifts could be assembled in arrays, clusters, or vanes studded with micro-coils of gravitic knots". These units were then mounted on a vehicle or spacecraft, usually on the underside. The many repulsorlifts needed for a large ship were typically powered by a dedicated "antigrav generator."
Ships as massive as the era were only able to make planetfall with the aid of massive ventral repulsorlift suspensor units. In fact, the landing legs of a Lucrehulk-class Core Ship could not support the ship's immense weight without the aid of repulsorlifts.
The five planets of the Corellian system possessed massive repulsors on their surface. They were so powerful that they could destroy capital ships in nearby space, and even stop the devastating firepower of Centerpoint Station, which created gravitational shifts great enough to destroy stars.
The Verpine of the Roche asteroids utilized repulsorlifts in asteroid shepherding. Vehicles that commonly employed repulsors include speeder bikes, swoops, landspeeders, airspeeders and starships capable of operating in a planetary atmosphere. Power chairs, repulsorsleds and skimboards also used this technology.
Jaina Solo and Lowbacca along with scientists discovered that a miniature repulsor could mimic the gravitic signature of a Yuuzhan Vong ship they captured, the Trickster, enabling the New Republic to trick the Vong into attacking their own ships, creating decoys, and confusing them in battle. This would turn the tide of the Yuuzhan Vong War.