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对给定的飞行任务，计算了推进系统采用国外现有、改型以及新型液体火箭发动机时，主推进系统发动机的组成方式对单级入轨运载器干质量的影响。对推进系统采用改进SSME的单级入轨运载器，计算了在运载器起飞质量不变的情况下，发动机比冲和质量对运载器有效载荷的影响，以及在有效载荷不变的情况下，发动机比冲和质量对运载器子质运的影响。计算结果表明，推进系统采用双燃料双膨胀发动机的单级入轨运载器具有最小的干质量。
For a given mission, the influence of the main propulsion system engine’s composition on the dry mass of a single-stage orbiting vehicle is calculated when the propulsion system adopts existing, modified and new liquid propellant rocket engines abroad. The single-stage orbiter with improved SSME is adopted in the propulsion system. The impact of engine overshoot and mass on the payload of the vehicle is calculated under the condition of the same takeoff quality. In the condition of unchanged payload, Effects of Engine Specific Impulse and Mass on Carrier Submass Transportation. The calculation results show that the propulsion system has the lowest dry mass for the single-stage rail-in-board with dual-fuel twin-expansion engine.