The Gundam development plan, launched in UC0081, is based on the design concept of the RX-78 Gundam, a masterpiece machine from the One Year War. It was aimed. The first draft, RX-78GP01, and the second draft, RX-78GP02A, which specializes in assault attacks, were both completed assuming operations under gravity. The high refinement of the Luna Titanium (Gundarium Alpha) alloy is a major reason why it was able to acquire strength and mobility that far surpassed that of the mobile suits of the One Year War. In addition to the basic design of the RX series, Anaheim Electronics, which was in charge of development in a secret tie-up with the Earth Federation Forces in this project, acquired Zeonic, the largest military manufacturer in the former Principality of Zeon, as its business expansion after the war. By acquiring it, they also acquired a number of mobile suit technologies that were said to be ten years ahead of the Federation Forces in advanced technology. It can be said that this is the reason why the Earth Federation Forces single-handedly appointed Anaheim Corporation. GP01, which was completed with the introduction of a newly designed core block system, went up to outer space with the assault landing ship Albion for a pursuit mission to recapture GP02A, which was stolen by Major Annabelle Gato of the Delaz Fleet, but was in zero gravity. As a result of fighting with the Delaz Fleet without having the aircraft control function corresponding to the GP01, the aircraft was severely damaged, and the GP01 was transported again to the Anaheim Electronics Livermore factory in Von Braun City, where the specifications were changed for space battles. . The Core Fighter II, which is the core of the aircraft, is also equipped with a rocket motor for outer space (originally, the idea was to convert the Core Fighter II for space navigation so that the GP01 could easily become a space-ready machine. There was), and a reverse rocket engine was incorporated in the space that was previously used as an air intake. Normally, it is shielded by a protective outer shell, but when the cover is opened, the rocket engine nozzle is exposed and fixed in the forward position, and by using it in combination with the thrust direction of the rear rocket, it can be used in three-dimensional super space. Enables pivot turning. Originally, the basic design of the GP01 was to enhance the convenience of exchanging armor and exterior parts (repairing damage during battle) for the skeleton frame of each part of the fuselage, and in this refurbishment, an integral tank was installed for attitude control. Exterior armor (especially the legs) is installed, and vernier units are added to the shoulder tops of both arms. The biggest feature of this specification is the multi-angle vernier unit = universal boost pod that is pivoted on both sides of the space battle core fighter II. The strength of Luna Titanium has succeeded in providing resistance to high torque, and in addition to airframe control that had previously relied on the AMBAC system, by sharing the vector with the main engine, it is possible to instantaneously concentrate thrust. and Of course, it can also be used as a mass balance. In fact, this technology also led to the development of variable mobile suits, which would later be used in the Gryps campaign (the fact that Anaheim's technology development department was exposed to the involvement of various intelligence organizations was a limit in terms of counterintelligence). It is also a manifestation that the control of the Earth Federation Forces did not function sufficiently in the postwar world). The refurbished GP01 was given the subtype and common name of RX-78GP01Fb = Gundam Zephyranthes Fulburnian as a pure space battle specification. In addition to the XBR-M82a Beam Rifle with an energy pack supplied as the main armament, the high-power XBR-L83d option developed in parallel for the GP03 can also be used. However, it is said that it malfunctioned during the Lunga Offshore Artillery Battle and could not demonstrate its full performance. The defensive shield of this Fb specification machine has been changed to one with anti-beam coating on the front and back. The anti-beam coating technology had already been put into practical use at the end of the war at Zeonic, and Anaheim had introduced this technology as standard equipment in this project as well. Although it was a hastily constructed refurbished aircraft (refurbishment work was carried out at an astounding 48 hours under the initiative of Nina Purpleton, the system engineer dedicated to the development of this aircraft), the performance of the GP01Fb is more than sufficient for a space combat aircraft. Demonstrated, captured GP02A after the Federation Forces naval review attack, and succeeded in shooting down while hitting each other. However, due to damage to the booster unit, the Core Fighter II's escape system did not function, and the pilot, Second Lieutenant Kou Uraki, was forced to escape from the aircraft on his own. The degree of perfection of this machine was undoubtedly superior to the mobile suits deployed by the Federation Forces, which would be reorganized four years later, when the manufacturing cost and complexity of operation were excluded. .