猎鹰9号是一枚2级火箭，一般来讲，一级火箭考虑的主要目标是快点起飞，要对抗地心引力，要对抗空气阻力，推力大点好，猎鹰9号捆绑9枚发动机解决了问题，可是火箭的第二级就不是这么考虑问题了。那时候火箭已经到了太空，不考虑空气阻力，这时候换用高比冲的发动机是最合算的。一般都是用氢氧发动机，氢氧发动机的比冲一般都在4百多。高出煤油发动机一大截。比如说，长征8号的第2级用的2台YF75就是氢氧发动机，比冲高达438。那么猎鹰9号该怎么办？马斯克没有氢氧发动机。马斯克只有在梅林1C的基础上改进出真空管版发动机，想尽办法提高煤油发动机的比冲。最简单的办法就是加大喷管。我们的长征5号火箭，中央芯级用的是两台YF77发动机。你想加大喷管，没地方，空间不允许，两台发动机的喷管要磕碰的。可是猎鹰9号就不一样了，第二级只有一台发动机，喷管可以尽量加大，比发动机本身都粗好多。这一招果然是变态，真空板梅林1C发动机的比冲高达336，比很多号称高比冲的高压补燃发动机都要高。你别忘了这只是个燃气发生器的发动机哦……
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