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40年来,美国空军(USAF)一直把航空航天飞机(空天飞机)当作长期的蓝图,倡导者声称可回收空天飞机每发射一磅有效载荷的发射经费可由原来的10000美元节省到1000美元,不论是发射卫星还是执行其他任务,都将给予USAF在空间开发方面更大的灵活性。 为使航天飞机以25马赫飞行入轨,然后安全返回地球,航天界早已开始了无数航天器试验以寻求所需技术。但是,由于USAF在政策和财政上没有得到华盛顿对空天飞机的支持,到位资金和政府许诺的相差甚远,最近X-33空天飞机计划的终结再次表明技术上存在巨大障碍。
For more than 40 years, the U.S. Air Force (USAF) has been using the long-awaited blueprint for an aerospace aircraft (space shuttle). Proponents claim that the cost of launching a 1-pound payload for a reusable space shuttle can be reduced from $ 10,000 to $ 1,000 , Whether launching satellites or performing other missions, will give USAF greater flexibility in space development. In order for the space shuttle to fly into orbit at Mach 25, and then safely return to Earth, the space community has already started countless spacecraft trials to find the technology it needs. However, since USAF did not receive the policy and financial support from Washington for the space shuttle, the difference between the funding in place and the one promised by the government lags far behind. The recent end of the X-33 space plane program once again demonstrated a huge technical obstacle.