Editing Repulsor engine

{{Status|Canon}}
{{Disambig header|Covenant starship engines|the gravity manipulation technology|anti-gravity technology}}
[[File:H3 TsavoHighway BattlecruiserEngines.jpg|thumb|300px|The ''Gablien''-pattern repulsor engines of a battlecruiser.]]
A '''repulsor engine''', also referred to as a '''repulsor drive''', is a diametric drive used by [[Covenant]] ships for sublight navigation,{{Ref/Book|Id=wf92|HWF|Page=92}}{{Ref/Book|Id=Enc22|Enc22|Page=223}} configured for swift and agile localized transit.{{Ref/Book|HM|Page=154}}

==Functionality and mechanics==
Repulsor engines use stacked tidal gravity generators which create asymmetrical gravity fields that push and pull a ship through space in a desired vector, all without the need for reaction mass or conventional exhaust. An extremely sophisticated application of [[Anti-gravity technology|gravitics]],{{Ref/Reuse|wf92}}{{Ref/Book|Id=wf62|HWF|Page=62-63}} these engines are powered by a ship's [[pinch fusion reactor]]s.{{Ref/Book|Id=wf70|HWF|Page=70-71}} Modern repulsor engines are finely tuned and expected to operate for years without maintenance refreshes. However, the repulsor engines on older, [[Vestige|vestigial]] [[warship]]s—such as the drives outfitted on the {{Pattern|Hekar Taa|blockade runner}} — are cruder pieces of technology, requiring constant monitoring and adjustment to operate at full power.{{Ref/Book|HWF|Page=79}}{{Ref/Reuse|Enc22}}

A repulsor engine produces quantum fluctuations in its wake that are extremely hazardous to personnel and nearby vessels within its range, particularly when operating at high "thrust".{{Ref/Reuse|wf62}}<ref>''[[Halo: Ghosts of Onyx]]'', p. 331</ref> These fluctuations are capable of interfering with the operation of gravitic technologies in the vicinity of the fluctuations. Prolonged exposure to unshielded repulsor drive elements can cause neurological degradation and even psychosis in most species - something the [[San'Shyuum]] considered largely beneath their notice.{{Ref/Reuse|Enc22}}

==Models==
[[File:HR-SDVHeavyCorvette-SideScreen.jpg|thumb|250px|''Callipoas''-pattern repulsor engines on a corvette]]
===Human===
*[[Fusion drive#XR2 Boglin Fields: S81/X-DFR|XR2 Boglin Fields: S81/X-DFR]] - Installed on the {{UNSCShip|Infinity}}.{{Ref/Book|HM|Page=132}}

===Covenant===
;''Callipoas''-pattern
*Four ''Callipoas''-pattern repulsor engines are installed on the {{Pattern|Ceudar|heavy corvette}}.{{Ref/Reuse|wf70}} As part of [[Operation: UPPER CUT]] during the [[Fall of Reach]], [[NOBLE Team]] and other [[FSS-1000 Sabre]] pilots disabled the four ''Callipoas''-pattern engines of the ''[[Ardent Prayer]]'' to conduct a [[Naval boarding|boarding]] action.{{Ref/Level|Id=LNoS|HR|Long Night of Solace (level)|Long Night of Solace}}

;''Galbien''-pattern
*Two ''Galbien''-pattern repulsor engines are installed on the {{Pattern|Ket|battlecruiser}}.{{Ref/Reuse|wf62}}

;''Raphyus''-pattern 
*Three ''Raphyus''-pattern repulsor engines are installed on the {{Pattern|Kerel|assault carrier}}.{{Ref/Book|HWF|Page=77}}

==Gallery==
<gallery>
File:HE12 Infinity Exit.jpg|A ''Ceudar''-pattern with ''Callipoas''-pattern engines, confronting the {{UNSCShip|Infinity}}.
File:H4 Landfall Corvette 2.jpg|A ''Ceudar''-pattern vessel with green colored ''Callipoas''-pattern engines over [[Casbah City]].
File:H4 FUD SDV-corvette.jpg|''Ceudar''-pattern vessels with paler colored ''Callipoas''-pattern engines at the [[Corbulo Academy of Military Science]].
File:H3-AssaultCarrier-Underside.jpg|A ''Kerel''-pattern assault carrier's underbelly with ''Raphyus''-pattern engines.
</gallery>

==List of appearances==
{{Col-begin}}
{{Col-2}}
*''[[Halo: Combat Evolved]]'' {{1st}}
*''[[Halo: First Strike]]''
*''[[Halo 2]]''
*''[[Halo Graphic Novel]]''
*''[[Halo 3]]''
*''[[Halo Wars]]''
*''[[Halo Legends]]''
*''[[Halo 3: ODST]]''
*''[[Halo: Reach]]''
*''[[Halo: Combat Evolved Anniversary]]''
**''[[Terminal (Halo: Combat Evolved Anniversary)|Terminals]]''
{{Col-2}}
*''[[Halo 4: Forward Unto Dawn]]''
*''[[Halo 4]]''
**''[[Spartan Ops]]''
*''[[Halo 2: Anniversary]]''
**''[[Terminal (Halo 2: Anniversary)|Terminals]]''
*''[[Halo: Fleet Battles]]''
*''[[Halo 5: Guardians]]''
*''[[Halo Mythos]]''
*''[[Halo Wars 2]]''
*''[[Halo Infinite]]''
{{Col-end}}

It is possible that repulsor engines are a form of [[Wikipedia:reactionless drive|reactionless drive]] that make use of negative matter. [[wikipedia:Exotic matter|Negative matter]] would have negative mass and would have a "repulsive" effect on the normal matter of the ship if placed behind it. 

==Sources==
{{Ref/Sources|2}}
[[Category:Covenant technology]]
[[Category:Propulsion]]