反应堆舱
加长的一部分可能还与反应堆舱的尺寸有关。
Part of the extension may also be related to the size of the reactor compartment.
这样，当普通燃料火箭到达地球轨道约800公里高度时，核反应堆舱会脱离化学燃料火箭，并开始工作。
Then, once the vehicle had ascended to high-Earth orbit, above about 800 kilometers, the nuclear reactor module would detach from the chemical rocket and start up.
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