Using of powdered fuel is almost impossible during all history of rocket engines. It burns so fast that the gas pressure destroys the engine’s casing. To solve this problem the fuel is pressed usually and an inhibitor is added. In my research I developed a new technology of controlling pressure inside the solid-fuel rocket. It simplifies greatly the process of making engines, allowing adjusting their parameters to get the maximum thrust safe pressure inside engine. Using this technology I created a working small engine for rocket modeling. It was tested and works well in real flights. I will continue the research of my new technology to understand its limits, increase efficiency and possibility to scale up for bigger appliances. It’s the next generation of solid-fuel rocket engines.