Working Pulse Jet (Scalable)

This is a working scalable pulse jet. I got it to run for a bit under 20 seconds before parts began to melt and it ran very stable and clean without needing a spark plug. To get it to run, I simply used a bicycle pump, a lighter, and some isopropyl alcohol. I printed it using regular PLA and it worked great. Please LIKE and FOLLOW if you want more fun designs like this. It would also help a ton if you could support my website https://rcbasics.com/ or my youtube channel https://www.youtube.com/@BalsawoodRCPlanes-zx1je where I have other model airplane files and information.
Steps to start the pulse jet:
1. add a tbsp of isopropyl alcohol if printing to 100% size (scale accordingly).
2. shake and rotate at least 360 degrees to guarantee that the isopropyl alcohol has coated the walls of the combustion chamber.
3. use a bicycle pump to provide a very slight breeze through the engine to help favor combustion (you only need air to start it and can stop once the cycles begin.
4. Use a l