Japan has succeeded in the first-ever flight test of its RV-X experimental reusable rocket prototype.
The launch — or hop, considering its duration and distance — took place at the Japan Aerospace Exploration Agency’s (JAXA) Noshiro test facility on July 11 and lasted about 40 seconds. The 24-foot-tall (7.3 meters) test vehicle, powered by a single engine, rose just over 33 feet (10 m) in the air and traveled a horizontal distance of approximately 50 feet (15 m) across the site’s concrete pad before touching down softly on the side opposite its liftoff point.
The short test flight went exactly as planned and puts JAXA and its partners one step closer to the development of a technological spaceflight achievement only ever accomplished by a small handful of orbital rockets — SpaceX’s Falcon 9, Falcon Heavy and Starship, Blue Origin’s New Glenn and, most recently, China’s Long March 10B.
JAXA’s RV-X is being developed and operated in conjunction with Japan’s Mitsubishi Heavy Industries and is a precursor vehicle to a single-stage reusable flight experiment project called CALLISTO. CALLISTO is a joint venture involving JAXA, France’s space agency CNES and the German Aerospace Center (DLR) to design and build a single-stage rocket capable of vertical launch, landing, refurbishment and reuse. That vehicle will itself be a pathfinder rocket as JAXA seeks its own entry into the cost-saving playing field of reusable launch services.
Japan’s most advanced rocket in operation, the H3, was introduced in 2023 but wasn’t designed for reusability. The H3 is more efficient and cost-effective than its H-2A predecessor, which was retired last year. But two of the new rocket’s eight launches have not been fully successful, and it falls short in its cost-effectiveness compared to more advanced reusable rocket stages. So JAXA is hard at work on the H3’s future replacement.
“Reusable rockets require consideration of operational feasibility,” JAXA’s website says. “By repeatedly verifying maintenance, operation, vehicle movement and launch pad setup using an actual experimental vehicle in preparation for flight tests, we were able to establish operational procedures that will contribute to the repeated operation of future rockets.”
The test, and the RV-X vehicle itself, slightly resemble a similar flight article from SpaceX’s early Starship development days. The “Starhopper” Starship prototype was compared to a water tower during its first “hopper” test in 2019. The first time the stumpy, three-legged, steel Starhopper jumped off the ground at SpaceX’s Starbase facility in South Texas, it flew about 65 feet (20 m) straight up and back down.
Starhopper’s success paved the way for higher jumps for longer durations as SpaceX honed Starship’s early design, and the same is planned for RV-X. Now that JAXA’s test rocket has completed its first 33-foot (10 m) hop, Japan’s space agency is looking higher, too. RV-X’s next launch is expected to fly as high as 330 feet (100 m), with another lateral crossover and hover included in its flight before landing.
