HOPE (H-II Orbiting Plane) was a Japanese experimental spaceplane project designed by a partnership between NASDA and NAL (both now part of JAXA), started in the 1980s. It was positioned for most of its lifetime as one of the main Japanese contributions to the International Space Station, the other being the Japanese Experiment Module. The project was eventually cancelled in 2003, by which point test flights of a sub-scale testbed had flown successfully. History The original HOPE project called for the building of a sub-scale orbital prototype known as HOPE-X, for H-II Orbiting Plane, Experimental. This would be used for flight testing and systems validation, before moving onto the larger HOPE, which used many of the same parts and general design in a 4-man design. As the name implies, both would be launched on Japan's new H-2 launcher, the full-scale HOPE requiring substantial upgrades in performance. At the time, Japan was an up-and-coming industrial powerhouse, and their space program was moving from success to success. There was little doubt, and a little trepidation, that HOPE would be successful. Models and test flights As part of the overall Japanese space program, testing for technologies that would be used on HOPE and other projects was well advanced. In February 1994 the first test flight of the new H-2 launcher was used to also launch the experimental OREX ballistic re-entry vehicle, which tested various communications systems, heating profiles and heat shielding components. Another project, HYFLEX, followed in February 1996. Hyflex was intended to test the carbon-carbon heat shielding tiles that were intended to be used on HOPE, as well as having the same body shaping in order to gather data on hypersonic lifting. HYFLEX was successful, but sank in the Pacific after splashdown before it could be recovered. Another test project, ALFLEX followed HYFLEX in 1996. Reduction in scope In 1997, well into the study, it was decided that HOPE-X should be modified into an unmanned cargo vehicle with the addition of automated approach and docking systems, and a cargo bay with doors similar to the one on the U.S. Space Shuttle. It was believed this would result in a "quick and dirty" cargo supply system for ISS, which was suffering from continued delays due to problems with the Shuttle program. It was estimated that such a conversion could be completed for an additional US$292 million, less expensive than designing a completely new