while running the testruns we always faced the problem that the flame was blown out or didnt even got in the combustion chamber. we discovered that the flame keeps better in the combustion chamber when the chamber itself is hot. so we heated it up before the testrun,
3d printed jet engine parts, worked a little bit more sensitive on the gas valve and we got a better result then. just check out the pressure display during the testrun.
unfortunately on the last run the starter motor broke, so we had to use the compressor this time again. however, doesn’t look like it changed much concerning the rpm. as you have already seen, the engine still does not run self sustain. what is also very strange: while its running, you can hold your hand behind the enginge and you’ll realize: there is some warmth, but no thrust. its more like a warm breeze, it got a good temperature, but its still just a breeze.
you simply do not notice anything like you can feel the thrust from the propeller of an rc airplane. there is obviously no excess pressure in the turbine (you clearly saw that) but you need for a engine. so this is really strange. we also discovered, that while cooling down, the longer it runs, there are some strange sounds like “clackâ€.
there is probably something warped, because actually there is enough space, even with thermal expansion there shouldn’t be a contact.
so we have to investigate on that. however, this still does not explain why we can not feel any air draft there, this still leaves us puzzling.
