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The highest specific impulse for a chemical propellant ever test-fired in a rocket engine was 542 seconds (5.32 km/s) with a tripropellant of lithium, fluorine, and hydrogen. However, this combination is impractical.
Engine Origin Designer Vehicle Status Use Propellant Power cycle Specific impulse (s) [a] Thrust (N) [a] Chamber pressure (bar) Mass (kg) Thrust: weight ratio [b] Oxidiser: fuel ratio
The highest-specific-impulse chemistry ever test-fired in a rocket engine was lithium and fluorine, with hydrogen added to improve the exhaust thermodynamics (all propellants had to be kept in their own tanks, making this a tripropellant). The combination delivered 542 s specific impulse in vacuum, equivalent to an exhaust velocity of 5320 m/s.
The NK-33 is among the most powerful LOX/RP-1 powered rocket engines ever built, noted for its high specific impulse and low structural mass. The NK-33 was an improved version of the earlier NK-15 engine, which powered the original N1 launch vehicle. Key upgrades included simplified pneumatic and hydraulic systems, advanced controls, enhanced ...
As of 2020, the thrust of the Merlin 1D Vacuum is 220,500 lbf (981 kN) [39] with a specific impulse of 348 seconds, [40] the highest specific impulse ever for a U.S. hydrocarbon rocket engine. [41] The increase is due to the greater expansion ratio afforded by operating in vacuum, now 165:1 using an updated nozzle extension. [40] [42]
The F-1 engine is the most powerful single-nozzle liquid-fueled rocket engine ever flown. The M-1 rocket engine was designed to have more thrust, but it was only tested at the component level. The later developed RD-170 is much more stable, technologically more advanced , more efficient and produces more thrust, but uses four nozzles fed by a ...
Each version of the engine has a corresponding Raptor Vacuum (RVac) variant [78] with an extended, regeneratively-cooled nozzle for higher specific impulse in space. The vacuum-optimized Raptor targets a specific impulse of ≈380 s (3,700 m/s). [8] A full-duration test of version 1 of Raptor Vacuum was completed in September 2020 at McGregor. [78]
The engine's 150:1 thrust-to-weight ratio is the highest ever achieved for a rocket engine. [8] [9] ... of thrust with a vacuum specific impulse (I sp) of 363 seconds ...