The background of the development of the two kinds of reusable high-performance engine is described. One of these two is the regeneratively cooled 1200 N thrust engine composed of two kinds of ZrO_2/Ni functionally graded materials (FGMs) chambers. This engine is a promising candidate for the future Japanese orbiting maneuvering system (OMS) engine of the H-II orbiting plane (HOPE). The other one is the reaction control system (RCS) engine which may also be used compatibly with HOPE. Developed RCS chambers are made of carbon-fiber-reinforced carbon matrix (C/C) composites coated with SiC FGMs.
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