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发表于 2009-9-2 01:00 PM
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中国运载火箭目前主要的推进剂还是用肼和四氧化二氮的有毒推进剂。新型的煤油液氧推进剂还没有普及,而液氢液氧推进剂技术也不是太稳定。
二炮的导弹因为要长时间贮存,一般都用固态推进剂,价格高但准备时间短。液态燃料准备以小时计,如果中途放弃发射又要花较长时间排干净燃料。
卫星折寿是没办法的事了,但总比什么都收不回来的好,能用多久算多久吧。印尼人娶法国媳妇请中国轿夫,轿子一进村就被放下了,法国媳妇只好徒步进门。因为远地点不够远,所以卫星要在近地点加速。
According to U.S. military tracking data, Palapa D is circling Earth on a path with a high point of about 13,150 miles, a low point of approximately 130 miles and an inclination of around 22 degrees.
Palapa D's planned orbit was not published before launch. It is unclear whether the satellite will be able to reach its operational station 22,300 miles above Earth in geosynchronous orbit. |
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