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"DARPA has contracted Raytheon to develop a practical version of a revolutionary air-breathing rotating detonation engine called Gambit, which would have no moving parts and could lead to lighter missiles with longer ranges at lower cost. ...
In an [Rotating Detonation Engine], a combustible mixture of fuel and air is introduced into a gap between two coaxial cylinders, with the gap sealed at one end and the other end forming into a nozzle. When the mixture is ignited, it burns in a very special way. The combustion takes the form of a supersonic wave that travels around inside the gap. As more fuel and air is introduced at the top, the wave continues going around in the gap, producing more and more heat and pressure, and is forced down until it exits through the nozzle, creating thrust. ..."
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