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"Everyman's Jet Engine" - Why Valveless Pulsejets?
I mentioned the ramjet -- an engine just as simple as the valveless pulsejet (and more compact, as well). The problem is, the ramjet won't run as a stationary engine; you have to use another propulsion system to get it up to some threshold speed that will allow it to begin operating. Thus, a design that seems simple actually demands greater complexity (outside of the engine proper) to start working as a propulsion system. Because of this, ramjets have little practical use for the hobbyist (though they are certainly interesting and have their devotees, of course).