What physical state defines Solid Rocket Motors before ignition?
Answer
Fuel and oxidizer are combined and cast into a solid structure (grain)
Solid rocket motors function based on having their fuel (reducing agent) and oxidizer pre-mixed and consolidated before launch. This combination is cast into a solid shape known as the propellant grain, which resides within the motor casing. This monolithic configuration is the source of their inherent simplicity, as it negates the need for complex plumbing, valves, or active feeding systems required by liquid engines. Once ignited, the combustion spreads across the exposed surfaces of this solid grain until all propellant is consumed, meaning the thrust profile is fixed from the moment of ignition.
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