When building a model rocket, it can be fun to get into the maths of it all—calculating the expected performance of your build, and then seeing how it measures up in the real world. To aid in that ...

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Up over tiny, bleak Wangeroog, easternmost of Germany’s crumbling chain of East Frisian Islands in the North Sea, one day last week shot a five-foot model rocket plane. Up it went with a fearful roar, ...

The rocket, a reaction-propulsion device that carries all of its propellants internally, has been around for almost a millennium since its invention in China. But the twentieth-century saw a ...