As discussed here, not only do orbital rocket engines run propellant through the walls of the engine to keep the combustion chamber from melting, but the pumps themselves flow upward of thousands of liters per second of cryogenic propellants, which makes the metals, valves, and bearing brittle and prone to failure. Igniting Liquid Rocket Engines Preconditioning The Engineīefore a liquid-fueled rocket engine is able to start, the engine must be prepared for the extremely low temperatures it’s about to experience from the liquid propellants. This comes with disadvantages, such as not being able to shut them down and lower performance than liquid rocket engines. This highlights the entire benefit of solids: they are super simple and super reliable. That booster charge then ignites propellant in an igniter initiator, which is what fires down the entire length of the solid rocket motor, lighting the entire surface of the core of the booster simultaneously. The NSDs burst a thin seal, which then ignites a pyrotechnic booster charge. To start these SRBs, a signal is sent to two completely redundant NSDs to ensure both boosters light properly. A render of the NASA Standard Detonator (Credit: Everyday Astronaut)
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