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苏联在1989年宇航联年会上披露了50-50空天运输机项目和苏联暴风雪号航天飞机缩比模型Bor 4和Bor 5试验性空间飞行器的内幕。这些至今鲜为人知的项目和试验性飞行器是苏联暴风雪号航天飞机的前身。 50-50项目 代号为50-50的空天运输机是米高扬设计局于1962年设计的。这种飞行器有两级,第一级是一架高超音速飞机,它能达到M5.5～6的速度。驮在其上面的航天飞机50与其分离后由常规的火箭级推入轨道。50-50空天运输机(见封二)的起飞重量为140吨,其中单座航天飞机重10.3吨,它不带任何有效
The Soviet Union disclosed at the 1989 IAA annual meeting the inside story of the 50-50 Sky Transport aircraft project and the Soviet Blizzard shuttle model Bor 4 and Bor 5 pilot spacecraft. These little-known projects and experimental aircraft are the predecessor of the Soviet Blizzard space shuttle. The 50-50 Sky Transport aircraft, code-named 50-50, was designed by Mikoyan Design Bureau in 1962. This aircraft has two stages, the first stage is a hypersonic aircraft, it can reach M5.5 ~ 6 speed. The space shuttle 50 mounted on it departs from it and is pushed into orbit by a conventional rocket stage. The take-off weight for the 50-50 Sky Transport (see Envelope 2) is 140 tonnes, of which the single-seat shuttle weighs 10.3 tonnes and it does not carry any effective