美国航天飞机问世以来,受到世界各国的普遍重视,一些航天技术先进的国家,跃跃欲试。 苏联正在研制的“Ram-R”航天飞机,已在今年春天试飞。它的外形与美国航天飞机相似,但起飞重量仅为1500吨(美国为6200吨),有效载荷可达20吨(是美国的2倍),它把卫星送到轨道上的费用仅为美国航天飞机的1/60。 Since the advent of the U.S. space shuttle, it has received widespread attention from all countries in the world, and some countries with advanced aerospace technology are eager to try. The “Ram-R” space shuttle being developed by the Soviet Union has already flown this spring. Its shape is similar to that of the U.S. Space Shuttle, but its take-off weight is only 1,500 tons (6,200 tons in the United States) and its payload is up to 20 tons (twice that of the United States). Its cost for sending satellites to orbit is only U.S. spaceflight. 1/60 of the aircraft.