The development of next generation cargo transfer spacecraft HTV-X is steadily progressing toward the launch of the first unit. Currently, the detailed design has been completed and the spacecraft manufacturing has begun. One of the key points in designing HTV-X is to address diversifying cargo requirements. Mitsubishi Heavy Industries, Ltd. (MHI) has carried out design invents by detailed design that meets the constraints of the spacecraft structure form, then conducted step-by-step prototype tests, and confirmed that these requirements can be satisfied. HTV-X will be used to deliver supplies to the International Space Station (ISS) and a plan to use an advanced version of this spacecraft to contribute to resupply of the lunar orbit crewed base (Gateway), which is being promoted mainly by the United States, is also under consideration. This report presents the development status of HTV-X, the results of the detailed design and efforts for a future plan related to an advanced version of this spacecraft.
