Stage Two freighter could carry itself, with an empty mass of 500 tons, to Uranus in 70 days for just 114 tons of fuel, and then bring back a load of 614 tons using about 254 tons of fuel.

一个第二阶段的货轮本身，具有500吨的空量，在去天王星70天里仅114吨的燃料，然后带回了614吨负载使用约254吨燃料。

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Its first stage is a souped-up version of one of the shuttle's solid-fuel rockets; its top stage is a similarly muscled-up model of the Saturn's massive J2 engines.

该火箭的第一级是发射航天飞机用的固体燃料火箭的马力加强版；顶端一级是同样增强了马力的用在土星火箭上的J2巨型发动机。

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Secondly, detenmine the optimum fuel arrangment on the basis of the Former stage results by employing a linear programming method or directly search method for successive every one of the multi cycle.

第二步，以前一步结果为条件，用线性规划或直接搜索法对多循环中相继的各个单循环进行燃料组件的优化布置；

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He adds that the newer version has a shorter launch time, better deterrent capability, and that it is a two-stage rocket using solid fuel that is highly maneuverable.

VOA: standard.2009.12.18

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The second stage, which burns a solid fuel, was produced by South Korean engineers.

BBC: South Korea halts rocket launch

The two other possibilities, which were ruled out, were on-island heat treatment - in an incinerator, gasification or pyrolysis plant - or a further stage of processing to produce a fuel product, which would also be shipped off-island.

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