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One wrong microsecond during ignition, and a Starship engine explodes. Here’s why Raptor needs multiple startup steps... Starting a SpaceX Raptor engine isn't as simple as turning a key or flipping a switch—it requires a fast, highly orchestrated sequence to safely ignite one of the most complex machines on...

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Engine ignition and liftoff of Starship on Flight 4 as seen from the launch tower
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Engine ignition and liftoff of Starship on Flight 4 as seen from the launch tower

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Inside Starship's combustion chamber, liquid methane and oxygen mix so violently they can create engine-killing shockwaves—unless you force them into a mini tornado. 🌪️👇#SpaceX #Starship #ShockWave

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Shutdown of a Raptor vacuum engine in slow motion. The engine’s nozzle is sized for use by Starship in the Earth’s upper atmosphere and outer space, so operation at sea level and low chamber pressures results in flow separation creating visible rings in the exhaust
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Shutdown of a Raptor vacuum engine in slow motion. The engine’s nozzle is sized for use by Starship in the Earth’s upper atmosphere and outer space, so operation at sea level and low chamber pressures results in flow separation creating visible rings in the exhaust

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A detailed unofficial animation of the full-flow Fuel Turbopump stack in the SpaceX #Raptor2 rocket engine that powers the Superheavy and Starship. Countdown to IFT3!

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I often wonder about how SpaceX plans to actually pull off multiple Starship flights per day. As Elon Musk has pointed out, computer simulations have steep limits you can't just simulate a vehicle traveling at 17,000 mph and experiencing 6 Gs on a screen. The answer is a massive, relentless physical testing pipeline that turns years of administrative certification into a rapid industrial manufacturing loop. To handle this cadence without bottlenecking the actual launch pads, SpaceX isolates its testing geographically: McGregor, Texas: The primary acceptance gate. Every single Raptor engine is shipped here for full-duration firings to qualify the combustion chambers and turbopumps. Massey's Outpost: Instead of risking the main orbital pads, ships and boosters go to this dedicated site for structural testing, static fires, and destructive evaluations. Before any Starship or Super Heavy booster is ever stacked for flight, it runs a strict 4-step gauntlet: → Cryo-Proofing: The vehicle’s tanks are pressurized and filled with extreme-cold liquid nitrogen or oxygen to verify the stainless-steel welds can handle thermal shock and flight-like stress. → Spin-Primes: Engine turbopumps are spun up to full operating speed with high-pressure gas—stopping just milliseconds before ignition—to test fluid dynamics without risking pad damage. → Static Fires: The vehicle is anchored down and the engines are hot-fired to test thrust vectoring, the aft dome's structural integrity, and the pad's water deluge system. → Wet Dress Rehearsal: A completely fueled, fully simulated launch countdown right down to the final seconds before ignition. Now, SpaceX is duplicating this entire operation on the East Coast. With a massive new facility at Florida's Roberts Road and dedicated on-site liquefaction plants at LC-39A, they are laying the groundwork to support up to 44 launches a year.

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Intuitive Machines flight controllers successfully fired the first liquid methane and liquid oxygen engine in space, completing the IM-1 mission engine commissioning. This engine firing included a full thrust mainstage engine burn and throttle down-profile necessary to land on the Moon. 🧵(16FEB2024 2020 CST) 1/3

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The most important upgrade to Starship isn't a new Raptor engine or a bigger booster. It's hidden beneath the launch pad. SpaceX is quietly changing how the world's largest rocket is fueled, and it could be the breakthrough that makes rapid reusability possible. #SpaceX #Starship #RocketScience #Cryogenics #Starbase

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🚨 BREAKING: 🇮🇳 India’s first ‘SpaceX-level’ rocket engine unveiled by Bengaluru startup Bengaluru startup Astrobase Space has unveiled EVEREST, India’s first fully integrated 80-tonne (800 kN) full-flow staged combustion engine running on liquid oxygen and methane. In this rare design, every drop of fuel and oxidiser powers the pumps before burning, delivering higher efficiency and reusability than standard engines. The complete engine, with 3D-printed core parts, was designed and manufactured entirely in India. Hot-fire tests are next as the company targets orbital flights by 2029.

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Flight 12 will debut the next generation Starship and Super Heavy vehicles, with both powered by the next evolution of the Raptor engine
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Flight 12 will debut the next generation Starship and Super Heavy vehicles, with both powered by the next evolution of the Raptor engine

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Ship 42 static fires complete. The Starship preparing for Flight 15 performed a full duration, six-engine static fire, and fired a single Raptor engine to simulate a deorbit burn
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Ship 42 static fires complete. The Starship preparing for Flight 15 performed a full duration, six-engine static fire, and fired a single Raptor engine to simulate a deorbit burn

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When a gas chamber filled with a fuel-air mixture is ignited, the flame does not instantly appear everywhere. Instead, it starts at the ignition point and spreads outward as a moving "flame front." For combustion to happen, fuel molecules must react with oxygen molecules. When a spark or flame provides enough energy, the first few molecules ignite and release heat. This heat then warms the nearby unburned gas, causing those molecules to reach their ignition temperature as well. The process repeats rapidly, creating a chain reaction that pushes the flame through the chamber. Think of it like a row of dominoes. The spark knocks over the first domino, which triggers the next one, and so on. In a gas chamber, heat and highly reactive particles called free radicals play the role of the falling dominoes. As the flame spreads, the hot combustion gases expand dramatically. This expansion creates pressure waves that move ahead of the flame. The speed of flame propagation depends on factors such as the fuel type, the fuel-to-air ratio, temperature, pressure, and turbulence inside the chamber. Turbulence mixes the gases more effectively, allowing the flame to spread much faster. In engines, this controlled flame spread is essential because it releases energy smoothly. However, if the flame spreads too rapidly or transitions into a shock wave, it can become a detonation or explosion,producing a sudden and destructive pressure spike. In short, a flame spreads because each burning region heats and ignites the next region, creating a self-sustaining wave of combustion that moves through the fuel-air mixture.
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When a gas chamber filled with a fuel-air mixture is ignited, the flame does not instantly appear everywhere. Instead, it starts at the ignition point and spreads outward as a moving "flame front." For combustion to happen, fuel molecules must react with oxygen molecules. When a spark or flame provides enough energy, the first few molecules ignite and release heat. This heat then warms the nearby unburned gas, causing those molecules to reach their ignition temperature as well. The process repeats rapidly, creating a chain reaction that pushes the flame through the chamber. Think of it like a row of dominoes. The spark knocks over the first domino, which triggers the next one, and so on. In a gas chamber, heat and highly reactive particles called free radicals play the role of the falling dominoes. As the flame spreads, the hot combustion gases expand dramatically. This expansion creates pressure waves that move ahead of the flame. The speed of flame propagation depends on factors such as the fuel type, the fuel-to-air ratio, temperature, pressure, and turbulence inside the chamber. Turbulence mixes the gases more effectively, allowing the flame to spread much faster. In engines, this controlled flame spread is essential because it releases energy smoothly. However, if the flame spreads too rapidly or transitions into a shock wave, it can become a detonation or explosion,producing a sudden and destructive pressure spike. In short, a flame spreads because each burning region heats and ignites the next region, creating a self-sustaining wave of combustion that moves through the fuel-air mixture.

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Starship’s twelfth flight test will debut the next generation Starship and Super Heavy vehicles, powered by the next evolution of the Raptor engine and launching from a newly designed pad at Starbase. The launch is targeted as early as Tuesday, May 19 →
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