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目前美国正在开发研制下一代运载火箭用的捆绑式固液混合助推器,以提供送入低地轨道更大范围的有效载荷能力(9～22.68t)。据称,固液混合火箭发动机将能解决使用固体发动机所面临的制造、操作方面的许多安全和环境问题。液氧/HTPB混合火箭发动机的比冲(I)基本上与液体发动机的相等,但超过在相同设计条件下所有固体火箭发动机的比冲。美国火箭公司研制固液混合发动机的经验表明,与固体或液体发动机如此,混合发动机的生产成本可降低30％,研制成本降低50％。
Currently, the United States is developing a bundled solid-liquid hybrid booster for the next generation of launch vehicles to provide a wider range of payload capabilities (9 ~ 22.68t) into low Earth orbit. Allegedly, solid-liquid hybrid rocket motors will solve many of the manufacturing and operating safety and environmental issues associated with the use of solid-state engines. The specific impulse (I) of a liquid oxygen / HTPB hybrid rocket engine is essentially equal to that of a liquid engine, but exceeds the specific impulse of all solid rocket motors under the same design conditions. Rocket Engineers’ experience in the development of solid-liquid hybrid engines shows that with solid or liquid engines, the cost of producing hybrid engines can be reduced by 30% and development costs by 50%.