Can the rocket engine be silent and invisible?
If you hear that somebody has spoken about the resonance or wave engines, they are meaning the engine, where the oscillating diaphragm is making the wave movement of the gas, which will push the aircraft across the air. That means that the engine will be acting as a powerful loudspeaker. The method of how this system creates the thrust is giving the nickname "cold jet engine" for that system. Theoretically, this kind of system is quite easy to build, but practical solutions are more complicated to make.
The test sort would seem like the space shuttle Enterprise at the image over this text. That means it is published as an example. That kind of system would be just the diaphragm or rather saying the layer where the rocket engines will blow their jet. Then the oscillation of that jet would transfer to that layer. But there is one little problem. Rocket engines would cause extremely high pressure, and that causes problems with materials of the shield.
There is many times talked about the aircraft, which doesn't require the jet engines to flight. One version of those fundamental engines is the loudspeaker, where the diaphragm would kick the air molecules backward or otherwise opposite direction of the flight. So how this kind of system can fly in the super- or hypersonic speed? The diaphragm must just move faster than the sound, and the air must conduct in front of it, and something must produce the energy, which moves that diaphragm.
One of the versions of this kind of solution just makes the shield over the jet- or rocket engine. Then the jet that comes from the jet pipe or nozzle would conduct to the chamber, and then the pressure would cause that the system would start to resonate with the outer layer of the chamber. The oscillation would cause that the aircraft would move across the sky without leaving the infrared trace.
If that kind of system would put to the VTOL (Vertical Take-Off and Land) aircraft, that system allows to land and take-off that thing without leaving the mark to the grass. And the thing that means the voiceless flight can be that the diaphragm would make the sound, what human eye cannot hear, and this means that the aircraft will look voiceless. This kind of system is causing the sound, but humans cannot realize it, and this makes them very useful.
But the problem is that the systems, what are making the pressure impulses that way are keeping very loud sound. And the infrasound is causing sleep problems. This kind of solution would be an otherwise fundamental and revolutionary engine solution.
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