The MAC round does push the ship backwards. Internal workings of the 14D4A1 MAC on Cairo Station. It is theorized that if a ship's armor or shields were to absorb all the kinetic energy of a super MAC round, the release of thermodynamic energy would still vaporize the ship. [On preview: as exphysicist345 says] the PoA will recoil to match the momentum of the slug, not the energy. Its exo-atmospheric combat capabilities were shown when the UNSC Infinity managed to use the Series-8 to puncture the Mantle's Approach's hull. The M68 Gauss Cannon is a UNSC weapon mounted on the M12G1 Light Anti-Armor Vehicle as well as on stationary turrets. Captain Wallace and Catherine Halsey were able to hold a short conversation complete with emphasizing pauses in the time it took for the UNSC Commonwealth's MAC to charge up an additional 20% (from 30% to 50%). Four of these are fitted on the Infinity.  Earth's Moncton-class platforms received power from stacked liquid-metal capacitance cells on the stations themselves. And because the slug is traveling at relativistic speeds, you need to use the relativistic mass to calculate its momentum. Also, Pillar of Autumn's MAC charges up faster than normal UNSC MACs, most likely due to Pillar of Autumn's advanced reactor(s). The weapon could be fired even when not at full charge, but the velocity of the projectile will be greatly diminished. Against Covenant shield technology, the rounds possess enough kinetic energy to punch through shields, cut through the ship, and, upon exit, still retain enough energy to destroy a second ship, and cripple a third ship.  The "Super MAC" mounted on one of the Reach orbital defense platforms was capable of firing a 3,000-ton slug at nearly "point four-tenths" the speed of light. Shipborne MAC draw power from the ship's reactor and require a charge of the weapon's magnetic coils in order to be fired. The Mammoth's "mini mac" seen through the HUD of a Spartan. A pellet of fuel is dropped into the middle of a chamber and gets high simultaneously from all sides by hyperpowerful laser beams. The time it takes to bring the MAC's systems to full charge on a UNSC vessel is the deciding force in a conflict.  All known frigate classes carry one light MAC system, whereas the standard destroyer carry two light MACs and the Marathon-class heavy cruiser carry two heavy MACs. At the moment a slug leaves an ODP-mounted MAC's muzzle, a pair of thrusters on the bottom side of the station fire for a few of seconds to counteract the acceleration imparted to the station. Despite this, it still takes at least thirty seconds for them to charge their MACs to 100%. , The size of a Magnetic Accelerator Cannon is such that it is normally an integral component of a warship's (or station's) structure and cannot be aimed independently; the space vehicle must maneuver to directly face a target. As a result, MAC rounds are often fired at significantly below their maximum potential velocity by an order of magnitude or more. , While powerful, these guns require long charge times, impacting their sustained firepower. See Morris, C. G. (1992), In every single space battle scene in the novels, including, Halo 4 : King of the Hill Fueled by Mountain Dew, Model 99 Special Application Scoped Rifle, Halo: Evolutions - Essential Tales of the Halo Universe, The Impossible Life and the Possible Death of Preston J. Cole, Halo: The Fall of Reach - The Animated Series, Academic Press dictionary of science and technology, https://www.halopedia.org/index.php?title=Magnetic_Accelerator_Cannon&oldid=1375730, ...that damaged organs can be replaced via, ...that Covenant starships are powered with. Charon-class light frigates were able to fire with only a few seconds of delay between shots during the Battle of Voi, though these shots were fired at an unconfirmed charge level. Thus, while a vessel may not run out of ammunition for a long time (depending on the size/weight of the shots and the capacity of the ship), a captain or commander has to carefully analyze the situation of a battle and use his shots strategically. In Halo Wars 2, the MAC Blast has been upgraded by Ellen Anders and Isabel into MAC Blast EMP, which is very effective against all mechanical units. The following MAC version currently have an unknown Mark or series. While not a purpose-built weapon like the Magnetic Accelerator Cannon, these platforms are still potent weapons of opportunity. in 2552 a Paris-class was know to fire a 600-ton depleted uranium slug. Sheer kinetic hitting power is capable of destroying whole targets. A manned version was used to defend the Pillar of Autumn on Reach. One nice thing about a coil gun is that you can invest energy in your projectile a little at at time, but your target receives the energy the old fashioned way. The weapons are as destructive as nuclear weapons without the risk of radiological contamination from ionizing radiation and fallout. The mass driver is an orbital launch assembly designed to propel low-weight payloads into orbit, otherwise known as orbital lifting, or to deliver them across a planetary system. The time it takes to bring the MAC's systems to full charge on a UNSC vessel is the deciding factor during in-combat use. The orbital defense platforms present in orbit of Reach were among the most powerful ever built, approximately 802.2 metres (2,632 ft) long  and capable of accelerating 3,000-ton projectiles to "point four-tenths the speed of light", placing it with pinpoint accuracy and impacting with a massive amount of kinetic energy.  A typical MAC round weighs multiple tons, and is constructed of super-dense ferric-tungsten. In the campaign, the MAC Blast is available in several missions, most notably Dome of Light, during which the player is granted access to forty rapid-fire MAC rounds to destroy a Covenant base, a feat that would be impossible outside of gameplay. While never formally incorporated as a weapon, mass drivers have been used at as defensive magnetic accelerator weapons at Harvest, the Rubble, Reach, Ivanoff Research Station and on UNSC Infinity. This technology is not to be confused with that of a railgun, in which a projectile is electromagnetically accelerated between two conducting rails. Fusion reactions produce more energy than fission, and since we don't really have any in the real world that work yet, there is a lot of latitude to decide how much power they can output. [note 3], The standard MAC can be enhanced with booster capacitors which allow the weapon to be fired three times per charge rather than once per charge. I prefer the idea of woo-woo scifi tech though... EndsOfInvention's answer of 0.8% of c doesn't take into account relativistic effects. The firing process uses electromagnetism to fire a ferromagnetic-tungsten slug at high velocity. MAC systems are also sometimes roughly divided between "heavy coil" and "light coil" guns. After the war, a new automated variant, the Mark 2551, was mounted on the UNSC Infinity and Ivanoff Station. A frontal view of a Charon-class light frigate's MAC. The Mark II is a MAC version that uses light coils. The shock-wave generated is powerful enough to knock in-atmosphere starships out of the air. The weapons are as destructive as nuclear weapons without the risk of radiological contamination from ionizing radiation and fallout. Orbital defense platforms have the same firing process, though they launch much more massive projectiles with greater frequency.  Two of these nearly 27m-bore coilguns were powerful enough to breach the Mantle's Approach's powerful defenses, allowing the Master Chief to enter the ship. Whatever material the cannon mount is made of, it's hard to believe it could sustain that kind of force without tearing loose. Emile-A239 manned the mass driver to fend off incoming Covenant Banshees and Phantoms before the Autumn could take off. Join 6,448 readers in helping fund MetaFilter. In skirmish and multiplayer, the MAC Blast can only be used if Captain Cutter is selected as the player's leader. A shipboard MAC draws power from the ship's deuterium fusion reactor and requires a charge of the weapon's magnetic coils in order to be fired. In Halo Wars, the MAC Blast ability allows the player to use the UNSC Spirit of Fire's point-defense MACs for pinpoint orbital bombardment. Isabel uses standard MAC rounds, while Johnson uses EMP rounds. A destroyer circa 2552 operating at half its usual power output required 50 minutes to charge up its two MACs to 100%, indicating it would normally take 25 minutes to charge both, or 12.5 minutes to charge one. The Magnetic Accelerator Cannon (MAC), also known as the Mass Accelerator Cannon, is a weapon system employed by the United Nations Space Command on its warships and orbital defense platforms.
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