Let me preface this post with a warning – rockets are dangerous. Please be extra careful if you even think about experimenting with them. Now onto the fun stuff…

With the exception of solid fuel model rockets, actual rocket engines have been out of the reach (and budget) of most DIY’s. However, there’s an older rocket technology called a pulse jet engine which is making a comeback amongst do it yourselvers. It was first invented by Germany and used in their notorious V-1 rockets (buzz bombs) in WWII. One reason they’re popular today is that they can be built with no moving parts. Here’s more info on how they work.

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