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{{Ratings}}
{{Status|Canon}}
{{Weapon Infobox
{{Weapon infobox
|image=[[File:Onager.jpg|300px]]
|image=[[File:HReach-OnagerMDC.png|300px]]
|name=Onager
|name=Mark 2488 Magnetic Accelerator Cannon
|manufacturer=
|manufacturer=[[Misriah Armory]]
|model=Mk/2488
|model=Mk/2488
|type=[[Magnetic Accelerator Cannon]]
|type=Magnetic Accelerator Cannon
|cost=
|cost=
|size=
|length={{Convert|106.9|ft|m|sp=us|disp=flip}}{{Ref/Book|Id=Enc22|Enc22|Page=182}}
|damage per hit=High
|width={{Convert|46.2|ft|m|sp=us|disp=flip}}{{Ref/Reuse|Enc22}}
|height={{Convert|33|ft|m|sp=us|disp=flip}}{{Ref/Reuse|Enc22}}
|weight=93.4 tonnes (103 tons){{Ref/Reuse|Enc22}}
|damage per hit=
|magazine=
|magazine=
|maxammo=
|maxammo=
|fire=
|fire=
|ammotype=15 cm metal projectiles
|ammotype=15 cm M895 HV/FTHPP (1.1 gigajoules per hit){{Ref/Reuse|Enc22}}<ref name="vis">'''[[Halo: The Essential Visual Guide]]''', ''page 114''</ref>
|operation=[[Wikipedia:Coilgun|Electromagnetic linear motor]]
|operation=[[Wikipedia:Coilgun|Electromagnetic linear motor]]
|rate of fire=
|rate=20 rounds a minute
|velocity=High
|velocity=High
|accuracy=High
|optics=
|range=
|range=Long
|era=
|service=[[Human-Covenant War]]
|counterpart=
|affiliation=United Nations Space Command
|counterwep=
|affiliation=[[United Nations Space Command]]
|mpguide=
}}
}}
The '''15cm Mark/2488 1.1GJ MAC''', also known as the '''Onager''' or often just referred to as a "'''[[Mass Driver]]'''", was a [[Magnetic Accelerator Cannon]] used by the [[United Nations Space Command]] during the [[Human-Covenant War]].<ref name="stats">'''[[Halo: Reach]]''', ''Game Stats''</ref>
The '''Mark 2488 Magnetic Accelerator Cannon''', formally designated '''15&nbsp;cm Mark/2488 1.1GJ MAC''', also known as the '''Onager''' and often referred to as a "'''[[mass driver]]'''", is a stationary [[Magnetic Accelerator Cannon]] used by the [[United Nations Space Command]] during the [[Human-Covenant War]].<ref name="stats">'''[[Bungie.net]]''' ''Halo: Reach'' game stats</ref>
 
The [[Mark 2551 Magnetic Accelerator Cannon|Mark 2551/25cm Portable]] is an upgraded variant of the weapon brought into service after the war.


==Design details==
==Design details==
The Onager is capable of firing a 15 cm round with up to 1.1 gigajoules of kinetic energy.<ref name="stats"/> It has five linearly arranged magnetic coils, each of which needs to charge individually before each shot. Additionally, the weapon needs to cool off after every shot, and does so by opening a radial vent on the upper portion of the barrel. The weapon is operated from a small booth on the left side of the cannon.<ref name="reach"/>
The Onager is capable of firing a 15&nbsp;cm ferric-tungsten hollow-point round with up to 1.1 gigajoules of kinetic energy.{{Ref/Reuse|stats}} It has five linearly arranged magnetic coils, each of which needs to charge individually before each shot. The weapon needs to cool off after every shot, and does so by opening a radial vent on the upper portion of the barrel. The weapon is operated from a small booth on the left side of the cannon.{{Ref/Reuse|reach}}


==Operational history==
==Operational history==
During the [[Battle of Reach]], a group of [[UNSC Marine Corps|UNSC Marines]] installed the Onager cannon on top of one of Reach's [[Aszod ship breaking yards|industrial facilities]] in [[Aszod]] to protect the {{UNSCShip|Pillar of Autumn}} while drydocked. [[Emile-A239]] manned the mass driver to fend off incoming Covenant [[Type-26 Ground Support Aircraft|Banshees]] and [[Type-52 Troop Carrier|Phantoms]] before the ''Autumn'' could take off.<ref name="reach">'''Halo: Reach''', campaign level ''[[The Pillar of Autumn (Halo: Reach level)|The Pillar of Autumn]]''</ref> However, the SPARTAN-III was killed by two Sangheili warriors, prompting [[SPARTAN-B312]] to commandeer the cannon and successfully delay the Covenant assault on the ''Autumn'' by crippling an incoming [[CCS-class Battlecruiser]] with a shot to the ventral energy projector.<ref name="reach"/>
During the [[Fall of Reach]], a group of [[UNSC Marine Corps|UNSC Marines]] installed an Onager on top of one of the planet's [[Asźod ship breaking yards|ship-breaking facilities]] in [[Asźod]] to protect the drydocked {{UNSCShip|Pillar of Autumn}}. [[Emile-A239]] manned the mass driver to fend off incoming Covenant [[Type-26 Ground Support Aircraft|Banshees]] and [[Kez'katu-pattern Phantom|Phantoms]] before the ''Autumn'' could take off.<ref name="reach">'''Halo: Reach''', campaign level ''[[The Pillar of Autumn (Halo: Reach level)|The Pillar of Autumn]]''</ref> However, the Spartan was killed by a [[Sangheili Zealot]], prompting [[SPARTAN-B312]] to commandeer the cannon and successfully delay the Covenant assault on the ''Autumn'' by crippling an incoming {{Pattern|Ket|battlecruiser}} with a shot to its ventral [[energy projector]].{{Ref/Reuse|reach}}


==Trivia==
==Trivia==
*This weapon is only seen once throughout the course of ''[[Halo: Reach]]'', featured on the level [[The Pillar of Autumn (Halo: Reach level)|''The Pillar of Autumn'']].
*The Onager is named after a [[Wikipedia:Onager (siege weapon)|medieval siege weapon]], which in turn takes its name from a [[Wikipedia:Onager|horse species]].
*It's named after a [[Wikipedia:Onager (siege weapon)|medieval siege weapon]], which in turn takes its name from a [[Wikipedia:Onager|horse subspecies]].
*On the ''Bungie.net'' weapons statistics page, the description for the Onager is simply "I need a weapon", a reference to a line by [[John-117]] in the opening cinematic of the level ''[[Cairo Station]]'' in ''[[Halo 2]]''.
*For the [[Bungie.net]] weapons statistics, the description for the Onager is simply "I need a weapon", a reference to the line delivered by [[John-117|Master Chief Petty Officer John-117]] in the opening cinematic of the level [[Cairo Station (level)|Cairo Station]] in ''[[Halo 2]]''.
*"S-239" is painted on the Onager's frame. This is a reference to [[Emile-A239]], who was killed while operating the weapon. Also, "S-266" is painted on the left side. That is a reference to [[Jun-A266]].
*The Onager is strikingly similar in appearance and function to the ship-mounted railgun used by the [[United States of America|United States Navy]] in [[Wikipedia:Transformers: Revenge of the Fallen|''Transformers: Revenge of the Fallen'']].
*The "[[using Onager early]]" glitch can be exploited so that a player can reach the driver before the scripted cutscene. This glitch can provide a player with an easy killing spree by shooting down [[Banshees]], or avoiding enemy lances by shooting the Phantoms carrying them.
*The Onager has "S-239" painted on it's hull. The service tag of [[Emile-A239|Emile]].


==Gallery==
==Gallery==
<gallery widths="160">
<gallery>
File:HaloReach - Mass Driver Cannon.jpg|First-person view of the Onager in ''[[Halo: Reach]]''.
File:HR_Onager_Early_Concept.jpg|An early concept for the Onager by [[Isaac Hannaford]].
File:HaloReach - MACrusher.jpg|The Onager, manned by [[SPARTAN-B312]], firing a round at the incoming Covenant CCS-class Battlecruiser.
File:HR_Onager_Concept.jpg|The cannon's final design.
File:HaloReach - Mass Driver Cannon.jpg|A first-person view of the Onager.
File:Onager.jpg|The Onager installed in the Asźod ship breaking yards.
File:HaloReach - MACrusher.jpg|The Onager, manned by SPARTAN-B312, firing a round at the incoming Covenant ''Ket''-pattern battlecruiser.
File:HReach-PillarOfAutumn-MDC.jpg|The Onager discharging a ferric-tungsten slug at the Covenant ''Ket''-pattern battlecruiser.
File:Onager_charging.jpg|An Onager's electromagnetic coils charging before it fires.
File:Onager_charging.jpg|An Onager's electromagnetic coils charging before it fires.
File:Onager_controls.jpg|The control booth of an Onager cannon.
File:Onager_controls.jpg|The control booth of an Onager cannon.
File:Onager.png|A blueprint for the Onager.
</gallery>
</gallery>


==List of appearances==
==List of appearances==
*''[[Halo: Reach]]''
*''[[Halo: Reach]]'' {{1st}}


==Sources==
==Sources==
<references/>
{{Ref/Sources}}


{{UNSC Heavy Weapons}}
{{UNSC heavy weapons}}
[[Category:Magnetic acceleration weapons]]
[[Category:Artillery]]
[[Category:UNSC ground weapons]]

Latest revision as of 13:43, August 6, 2023

Mark 2488 Magnetic Accelerator Cannon
HReach-OnagerMDC.png
Production overview

Manufacturer:

Misriah Armory

Type:

Magnetic Accelerator Cannon

Specifications

Length:

32.6 meters (106.9 ft)[1]

Width:

14.1 meters (46.2 ft)[1]

Height:

10 meters (33 ft)[1]

Weight:

93.4 tonnes (103 tons)[1]

Ammunition type:

15 cm M895 HV/FTHPP (1.1 gigajoules per hit)[1][2]

Operation:

Electromagnetic linear motor

Rate of fire:

20 rounds a minute

Muzzle velocity:

High

Effective range:

Long

Service history

In service:

Human-Covenant War

 

The Mark 2488 Magnetic Accelerator Cannon, formally designated 15 cm Mark/2488 1.1GJ MAC, also known as the Onager and often referred to as a "mass driver", is a stationary Magnetic Accelerator Cannon used by the United Nations Space Command during the Human-Covenant War.[3]

The Mark 2551/25cm Portable is an upgraded variant of the weapon brought into service after the war.

Design details[edit]

The Onager is capable of firing a 15 cm ferric-tungsten hollow-point round with up to 1.1 gigajoules of kinetic energy.[3] It has five linearly arranged magnetic coils, each of which needs to charge individually before each shot. The weapon needs to cool off after every shot, and does so by opening a radial vent on the upper portion of the barrel. The weapon is operated from a small booth on the left side of the cannon.[4]

Operational history[edit]

During the Fall of Reach, a group of UNSC Marines installed an Onager on top of one of the planet's ship-breaking facilities in Asźod to protect the drydocked UNSC Pillar of Autumn. Emile-A239 manned the mass driver to fend off incoming Covenant Banshees and Phantoms before the Autumn could take off.[4] However, the Spartan was killed by a Sangheili Zealot, prompting SPARTAN-B312 to commandeer the cannon and successfully delay the Covenant assault on the Autumn by crippling an incoming Ket-pattern battlecruiser with a shot to its ventral energy projector.[4]

Trivia[edit]

  • The Onager is named after a medieval siege weapon, which in turn takes its name from a horse species.
  • On the Bungie.net weapons statistics page, the description for the Onager is simply "I need a weapon", a reference to a line by John-117 in the opening cinematic of the level Cairo Station in Halo 2.
  • "S-239" is painted on the Onager's frame. This is a reference to Emile-A239, who was killed while operating the weapon. Also, "S-266" is painted on the left side. That is a reference to Jun-A266.
  • The "using Onager early" glitch can be exploited so that a player can reach the driver before the scripted cutscene. This glitch can provide a player with an easy killing spree by shooting down Banshees, or avoiding enemy lances by shooting the Phantoms carrying them.

Gallery[edit]

  • An early concept for the Onager by Isaac Hannaford.

    An early concept for the Onager by Isaac Hannaford.

  • The cannon's final design.

    The cannon's final design.

  • A first-person view of the Onager.

    A first-person view of the Onager.

  • The Onager installed in the Asźod ship breaking yards.

    The Onager installed in the Asźod ship breaking yards.

  • The Onager, manned by SPARTAN-B312, firing a round at the incoming Covenant Ket-pattern battlecruiser.

    The Onager, manned by SPARTAN-B312, firing a round at the incoming Covenant Ket-pattern battlecruiser.

  • The Onager discharging a ferric-tungsten slug at the Covenant Ket-pattern battlecruiser.

    The Onager discharging a ferric-tungsten slug at the Covenant Ket-pattern battlecruiser.

  • An Onager's electromagnetic coils charging before it fires.

    An Onager's electromagnetic coils charging before it fires.

  • The control booth of an Onager cannon.

    The control booth of an Onager cannon.

  • A blueprint for the Onager.

    A blueprint for the Onager.

List of appearances[edit]

Sources[edit]

  1. ^ a b c d e Halo Encyclopedia (2022 edition), page 182
  2. ^ Halo: The Essential Visual Guide, page 114
  3. ^ a b Bungie.net Halo: Reach game stats
  4. ^ a b c Halo: Reach, campaign level The Pillar of Autumn

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