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The hydro-electric dam bullet-valve and Junkers JUMO 004 jet turbine bullet- valves
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If you have the [citation needed] you should submit it to Wikipedia. Their
Jumo 004 entry has no mention.
Although it does cover my favorite starter --the two stroke APU with a pull handle.
...and the variable geometry Zwiebel:
On the original topic.I still struggle to explain the way it employs the Brayton Cycle. Apparently there is a high bypass airflow through the rotors' open hub, with each rotor being arrayed like the combustion chambers in a centrifugal flow jet engine.