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Difficult times for heavy-lift rockets

发布时间:2019-03-03 03:16:07来源:未知点击:

There is trouble afoot for the makers of a new generation of rockets capable of putting 20 tonnes in orbit. Last week, US air force investigators pinpointed the cause of the failure of Boeing’s Delta 4 heavy launcher, which failed to place its cargo in the correct orbit on its maiden flight in December. Its sensors shut off the first-stage engines too soon because bubbles in the fuel lines made them think the fuel had run out. Meanwhile Arianespace, the European company behind the Ariane 5 family,