A Valveless pulse jet (or pulsejet) is the simplest jet propulsion device ever designed, and is the simplest form of jet engine that does not require forward motion to run continuously. Valveless pulsejets are low in cost, light weight, powerful and easy to operate. They have all the advantages (and most of the disadvantages) of conventional valved pulse jets, but without the troublesome reed valves that need frequent replacement - a valveless pulsejet can operate for its entire useful life with practically zero maintenance. They have been used to power model aircraft, experimental go-karts and even some unmanned military aircraft such as cruise missiles and target drones.
Read more about Valveless Pulse Jet: Basic Characteristics, Basic (valved) Pulsejet Theory, Valveless Pulsejet Operation, Practical Design Issues, "Jam Jar Jet" Design, Pros and Cons
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