At Estes we are proud of our engine quality and have over 500 million successful launches to show for it. On this slide, we show a schematic of a solid rocket engine. Engines are the heart of any rocket launch. This page is an incomplete list of orbital rocket engine data. 1 Current and upcoming rocket … Solid rocket engines are used on air-to-air and air-to-ground missiles, on model rockets, and as boosters for satellite launchers.In a solid rocket, the fuel and oxidizer are mixed together into a solid propellant which is packed into a solid cylinder. The propellant contains both fuel and oxidizer; therefore these devices can operate in the vaccuum of space. An electrical signal is sent to the igniter which creates hot gases which ignite the main propellant grain (see image below). Conceptually, solid rocket motors (or SRMs) are simple devices with very few moving parts. A hole through the cylinder serves as a combustion chamber.