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美国洛克希德公司一家工厂的研究人员最近提出了一种不载人的单级入轨飞行器设想。他们称这种飞行器可以把每公斤有效载荷的入轨成本降低到1100美元甚至更低,而且2000年之后不久便可投入使用。 这种飞行器的推进系统将采用线性塞式喷管。整个推进系统由并排成一列的7台发动机组成,与升力体式的机体组合后形成一个空气弹道火箭飞行器,可将18吨的有效载荷送入185公里高的低地轨道(这一能力与大力神4相当),也可用于将空间站发射到556公里高的轨道。根据设想,它每次将在轨道上飞行12～72个小时,然后返回地面,采
Researchers at a Lockheed plant have recently proposed an unmanned single-stage orbiter concept. They say the aircraft can reduce the orbit cost per kilogram of payload to $ 1,100 or less and become operational shortly after 2000. This aircraft propulsion system will use a linear plug nozzle. The entire propulsion system consists of seven engines side-by-side combined with the body of the lift body to form an air-ballistic rocket vehicle that delivers 18 tons of payload to a 185-kilometer low Earth orbit 4), and can also be used to launch a space station to a 556-kilometer orbit. It is envisaged that it will fly on orbit for 12 to 72 hours each time before returning to the ground.