I posted this graph a few weeks ago:
The very strange thing is that the chamber pressure is 500+ PSI where the feed pressure is 250 or so. I believed I had a data collection anomoly. I do not. I just finished testing the pressure transducer and checking out the wireing and it is all correct. The calibration of the ggraph is also correct.
The mechanical schematic of my motor is:
So the only possible conclusion is that I have a resonant pulse jet with the check valves. I’m going to run it again with a lot higher pressure and higher time resolution pressure transducer in place.