MS-14A Gelgoog is the Principality of Zeon's general-purpose mass-production mobile suit from Mobile Suit Gundam (1979, U.C. 0079), reaching the front in December of that final year of the One Year War. Zeonic built the airframe, Zimmad supplied the thrusters and MIP developed the beam weapon, a split of work that the United Maintenance Plan's shared standards made possible.
What it does in the story
On paper the Gelgoog matched or slightly exceeded the Gundam, and it still could not change the outcome. Beam rifle production ran roughly two months behind the airframe, so only 67 machines were present for the battle at A Baoa Qu, and Zeon had so few experienced pilots left that student soldiers flew most of them. Surviving units served Zeon remnants for years afterwards, and the Federation kept some as aggressor trainers.
What makes it different
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It is the first mass-production Zeon mobile suit to carry a beam rifle.
Zeon built the rifle around energy-cap data obtained through Side 6, and its output is described as matching the RX-78-2 Gundam's weapon. Fitting it meant reworking the torso around a new thermonuclear reactor and cooling system.
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The close-combat weapon is a twin beam sword.
The beam naginata's hilt is about two saber grips long with an emitter at each end, so it can light one blade or both, and it stows on the back. Most pilots fought with a single blade because a two-ended weapon is awkward to swing.
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It has no backpack.
The main thrusters sit on the inner face of the rear waist skirt armour and a backpack is fitted only when a mission calls for one. The torso is split into three sections, with the cockpit block set into the abdomen.
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The forearms carry auxiliary thrusters.
Small propulsion units in the forearms were intended for work inside the atmosphere. In space they were dead weight, and some machines had them swapped for extra equipment or armour instead.
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Frequently asked questions
1. Why were only 67 Gelgoogs at A Baoa Qu?
Because the beam rifle was not ready. The airframe was finished in the autumn of U.C. 0079 but mass production of the rifle began in late November, so full deployment slipped, and the machines that did reach the fortress went out with pilots who had barely finished training.
2. Is Char's Gelgoog an MS-14A?
No. The red machine Char Aznable flies is the MS-14S commander type, the evaluation machine the MS-14A was derived from, and the official site lists it as an entry of its own. The A is the general-issue version of the same design.
3. Where are the thrusters if the Gelgoog has no backpack?
Inside the rear waist skirt armour, on its inner surface. That placement is why the legs and waist of the design are bulkier than a Zaku's, and why a backpack can be bolted on later without changing the silhouette.
4. What did the United Maintenance Plan change for the Gelgoog?
It standardised parts across Zeon's manufacturers, which let Zeonic, Zimmad and MIP work from shared specifications instead of three separate ones. The practical result was that the Gelgoog could be built on the existing Zaku II production line.
Background sources: MS-14A Gelgoog — Gundam Wiki · ゲルググ（日本語版 Wikipedia）
