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Just to answer my own question and not waste anybody’s time, all I needed to do was to invert the cylinder to get Liquid Gas to flow out. It worked! Here:


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This "university" project may have made an old mistake of scaling up before the design parameters were properly set. A pulse jet, theoretically, is a truly amazing engine that uses an invisible piston to compress the next batch of air and fuel, a resonant shock wave. A properly shaped "tuned pipe" must be made or it simply will not run effectively. So you ...


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To my eye, comparing with memory of many YouTube videos, the conical ends of the combustion chamber are too short and the bends in the exhaust pipe are both too small radius and the pipe is slightly flattened at those bends. The angle of the exhaust pipe shouldn't matter -- I've seen these build completely straight and gotten to run -- but the sharp bends ...


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The key to the operation of a valveless pulse jet is the oscillating shock wave created by repeated explosions in the combustion chamber. In this video they talk about using a spark plug to trigger these explosions initially, and once the engine is running the process is self sustaining. Looking at your video I don't see any connections to the engine except ...


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Low frequencies are attenuated less over distance and by obstacles. The lower frequencies, even from the music from a dance hall or band, or that car near you playing loud music will be heard first. It may be all you hear! It is also common that as we get older, and especially those in aviation, we become high tone deaf!!


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The air attenuates high frequencies more than it does low. Thus, lower frequency sounds travel farther, so you hear them first. Also, longer wavelengths will appear to "bend" around obstacles more than ones with shorter wavelengths, so buildings around you will in many cases develop acoustic "shadow" zones for higher frequencies as those buildings' ...


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The jet engine efficiency is unfortunately more complicated than just a one-to-one function between static Turbine Inlet Temperature and efficiency. Thermodynamic efficiency of a turbine engine is defined as the useful generated power extracted from the chemical energy added by the fuel. The following is extracted from a paper format uni book on aircraft ...


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If you live in the approach path to a big airport, then there will be thumps and muffled booms as the landing gear is extended. It could be this that you are hearing.


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