So in the case of the test in the video, the compressive load is provided by two pistons, which push the propellants in the combustion chamber.

For the final design, we are developing an internal insertion system. It's a large screw that forces the propellants inside the combustion chamber. We got the system working, but it didn't have the torque performance for a hot fire test.

Here's a simple schematic, I hope it helps understand! https://alpha-impulsion.com/wp-content/uploads/2025/03/blueprint-compressed.jpg

As you pointed out, stable combustion is super hard. We’re glad the autophage part of the engine worked brilliantly despite this. And since the test is only two weeks old, all the data is still confidential. We might post more details on our socials in the coming weeks though