SpaceX Raptor

SpaceX Raptor
	A Raptor 1 rocket engine ready for transport outside SpaceX's factory in Hawthorne, California
Country of origin	United States
Manufacturer	SpaceX
Associated LV	SpaceX Starship
Status	In production
Liquid-fuel engine
Propellant	LOX / CH4
Mixture ratio	3.6 (78% O2, 22% CH4)
Cycle	Full-flow staged combustion
Pumps	2 turbopumps
Configuration
Chamber	1
Nozzle ratio	34.34 (sea-level),; 80 (vacuum);
Performance
Thrust	Raptor 1: 185 tf (1.81 MN; 408,000 lbf); Raptor 2: 230 tf (2.26 MN; 507,000 lbf); (sea-level); 258 tf (2.53 MN; 569,000 lbf) (vacuum); Raptor 3: 280 tf (2.75 MN; 617,000 lbf);
Throttle range	40–100%
Thrust-to-weight ratio	Raptor 1: 88.94 Raptor 2: 141.1 Raptor 3: 183.6
Chamber pressure	350 bar (5,100 psi);
Specific impulse, vacuum	Raptor: 350 s (3.4 km/s); Vacuum Optimized: 380 s (3.7 km/s)
Specific impulse, sea-level	327 s (3.21 km/s)
Mass flow	~650 kg/s (1,400 lb/s):; ~510 kg/s (1,100 lb/s), O2; ~140 kg/s (310 lb/s), CH4; ;
Burn time	Varies
Dimensions
Length	3.1 m (10 ft)
Diameter	1.3 m (4 ft 3 in)
Dry mass	Raptor 1: 2,080 kg (4,590 lb) Raptor 2: 1,630 kg (3,590 lb) Raptor 3: 1,525 kg (3,362 lb)

Raptor is a family of rocket engines developed and manufactured by SpaceX. It is the third rocket engine in history designed with a full-flow staged combustion fuel cycle, and the first such engine to power a vehicle in flight. The engine is powered by cryogenic liquid methane and liquid oxygen, a combination known as methalox.

SpaceX's super-heavy-lift Starship uses Raptor engines in its Super Heavy booster and in the Starship second stage. Starship missions include lifting payloads to Earth orbit and is also planned for missions to the Moon and Mars. The engines are being designed for reuse with little maintenance.