In a tightly controlled manufacturing hangar west of Paris, workers put finishing touches on a large, silver-colored engine destined for a first mission of the Ariane 64 configuration. The rocket, scheduled for Thursday’s maiden launch from Kourou, French Guiana, is Europe’s most powerful version of Ariane 6 and will fly with four boosters for the first time.
Ariane 64 is named after those boosters, which are intended to give the launcher a significant boost in performance for its planned payload: 32 satellites for Amazon Leo, a broadband constellation seeking to compete with SpaceX’s Starlink network. The mission will be launched from the European spaceport in French Guiana, according to the account provided by AP in the run-up to liftoff.
At ArianeGroup’s plant in Vernon, engineers design, integrate and test the engines for the heavy-lift launcher, while another ArianeGroup site west of Paris—at Les Mureaux—builds and assembles the rocket’s main stage components. The company said its work depends on a broad European industrial base, with engines and stages assembled from contributions across 13 European nations that are members of the European Space Agency.
ArianeGroup’s chief technical officer, Hervé Gilibert, said the Thursday flight is “a special launch — something new for us on Ariane 6.” He described the debut of the four-booster configuration as making the rocket “roughly twice as powerful” as the Ariane 62 version, and he said that configuration delivers “significantly more power, allowing much heavier payloads to be sent into space.” Gilibert also said the four-booster version could accelerate more than Ariane 62, “the version we have already launched five times.”
Company officials said components for Ariane 6 are produced across Europe, including Bremen in Germany for the upper stage and Les Mureaux in France for the lower, or main stage. Ahead of the launch, officials said all components have crossed the Atlantic to French Guiana for final assembly, and they described Ariane 64 as standing about 62 meters tall—roughly the height of a 20-story building.
Once the rocket is airborne, the mission is expected to last about one hour and 50 minutes, nearly one full orbit, before satellites are deployed in pairs from the top of the rocket. AP reported that the Vulcain 2.1 engine built at Vernon ignites first at liftoff; Emmanuel Viallon, director of the Vernon site, said that for “a few seconds, we verify that it is functioning properly,” before the solid boosters are ignited and the rocket lifts off.
The four boosters are designed to help propel the rocket at launch, consuming 142,000 kilograms of solid propellant in just over two minutes until they burn out, according to the account provided. Ariane 6, through both its launcher and engines, was designed to halve operating costs compared with its predecessor, Ariane 5, which last launched in 2023 and concluded a program that began in the late 1970s.
ArianeGroup also described engine testing intended to mirror launch conditions. At Vernon, engines are tested on site under near-real launch conditions deep in a forest, where reinforced structures hold engines in place as they fire at full power and test teams operate from underground control rooms; AP said the full testing cycle takes two to three weeks before the engines return for final adjustments. A test director at the Vernon site, identified only as Laurence for security reasons, said the engine arrival is “always a joy, it’s always very intense,” and she described the launch going well as bringing “a great deal of gratitude.”
At Les Mureaux, engineers are preparing components for upcoming missions, with large main-stage tanks—described as 5.4 meters wide including supercooled hydrogen and oxygen tanks feeding the Vulcain engine—lying horizontally as part of ongoing work. Caroline Arnoux, business unit director at ArianeGroup, said seven to eight launches are planned this year and described a strong order book “equivalent to about 30 launches,” with institutional missions and commercial launches in a split she characterized as roughly one-third and two-thirds, respectively.
In officials’ assessments of the market challenge, Ariane 64 was framed as one more step in Europe’s strategy to maintain independent access to space while competing with companies such as SpaceX. Hermann Ludwig Moeller, director of the European Space Policy Institute, said Ariane 64 “is an additional level of performance,” and he argued that there can be “hardly be any comparison with SpaceX,” which he said builds rockets, builds satellites and sells the service, while Europe operates through a more separated industrial setup.
Moeller said a challenge for Ariane 6 will be diversifying Europe’s customer base, which he said could involve preferential treatment for government missions and further development of commercial markets across the continent. Arnaud Demay, Ariane 6 project manager, said independent access to space remains the core objective of the program “to allow Europe to meet its own needs,” and he said the company is also working on “key technology bricks” aimed at enabling reuse of certain launcher components, ideally including engines powered at liftoff.
Demay added that he almost always cries with emotion when the rocket lifts off, saying, “We do it so rarely, and it’s so majestic when it takes off: that little touch of magic inevitably overwhelms me with emotion every time.”