How Raptor Engines and Starship Work
Starship is powered by Raptor, the first full-flow staged-combustion engine to fly. The engine and the fully-reusable vehicle around it are what make a Mars-class rocket plausibly affordable.
In short
- Raptor burns methane/oxygen and is the first full-flow staged-combustion engine to fly — maximal efficiency for reuse.
- Super Heavy clusters ~33 Raptors for record thrust; the stainless-steel ship carries crew and cargo.
- Starship aims for full, rapid reuse (booster caught by the tower, ship reflown) — still being proven in flight tests.
The Raptor engine
Raptor burns methane and liquid oxygen — a deliberate choice, because methane can in principle be manufactured on Mars from local ice and atmospheric CO2, and it burns cleanly enough for rapid reuse. Its key innovation is a full-flow staged combustion cycle: both propellants are routed through their own preburners and turbines before reaching the main chamber, so almost all of the propellant does useful work driving the pumps rather than being dumped overboard. That squeezes out more efficiency and runs the turbines cooler, which matters for an engine meant to fly again and again. Raptor is the first full-flow staged-combustion engine to reach operational flight — something no national space program ever fielded.
Super Heavy and the ship
Starship is a two-part stack. The lower stage, Super Heavy, clusters roughly 33 Raptor engines to produce more thrust than any rocket in history. The upper stage — confusingly also called "Starship" — is a stainless-steel vehicle designed to carry crew and cargo to orbit, the Moon and Mars. Stainless steel is an unusual choice for a rocket, but it is cheap, strong when cold, and tolerates re-entry heat well, which suits a vehicle meant to be mass-produced and reused rather than built as a delicate one-off.
Full reuse is the point
Falcon 9 reuses its booster; Starship is designed to reuse everything. The booster returns to the launch site and is caught out of the air by the tower's arms — first demonstrated in October 2024 — while the ship is designed to re-enter, survive with a heat shield, and be reflown. If full, rapid reuse works, the marginal cost of a launch drops toward the price of propellant and refurbishment, which is what would make routine flights to Mars economically conceivable. As of 2026 that full-reuse loop is still being proven in flight testing — the honest status is a radical design that is working piece by piece, not yet a finished operational system.
Frequently asked
Cite this page
Reviewed Jul 29, 2026ElonFacts.org. (2026). How Raptor Engines and Starship Work. Retrieved from https://elonfacts.org/explainers/how-raptor-and-starship-work
"How Raptor Engines and Starship Work." ElonFacts.org, Jul 29, 2026, https://elonfacts.org/explainers/how-raptor-and-starship-work.
@misc{elonfacts-explainers-how-raptor-and-starship-work, title={How Raptor Engines and Starship Work}, author={{ElonFacts.org}}, year={2026}, url={https://elonfacts.org/explainers/how-raptor-and-starship-work}}
https://elonfacts.org/explainers/how-raptor-and-starship-work