Model Rocket Engines That Require Certification. There are some model rocket engines that require certification, licensing, or permits in order to operate/use because they are considered high-powered. Here is a list of these certification levels and the corresponding rocket engine classifications they are assigned to. Level 1 Certification
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-5 Seventy-year-old Islamic tea shop serves up... A seventy-year-old Islamic tea shop in the Thai capital Bangkok still.. If the top engine has, say, 500 psi (pounds per square inch) chamber pressure and the bottom one has 2,000 psi, then these two rockets are — to first order estimates — operating at the same performance level. What does that mean? That means that you could have a great big, bulky rocket engine or you could have a small, “tight” one.