LΛUNCHER

This is what 99%+ combustion efficiency looks like for LOX/Kerosene.   Thanks to LOX cooling, E-2 doesn't require chamber film cooling.  Paired with a highly efficient injector, combustion efficiency and specific impulse are maximized, boosting payload capacity and unlocking more value from every mission to orbit.

Rocket engine hardware is continuously produced from powder in our factory. We leverage 3D-printing to manufacture our single-part, LOX-cooled E-2 combustion chamber, reducing cost and part count while enabling rapid design iteration. The upgraded chamber design shown supports a lighter, simpler engine with thrust vector control. E-2 rocket engines are made in America 🇺🇸 Propellants: LOX/Kerosene Thrust: 22k lbf (10 tf) Isp Sea Level: 290 s Isp Vacuum: 327 s Isp Vac Version: 365 s Cycle: Ox-Rich Staged Combustion

🚨 New max thrust record for E-2! 🚨 Last week, we boosted E-2 thrust by 23% to 27,000 lbf for multiple one-minute duration test fires. We’re pushing the limits to better understand the operating envelope in which E-2 can perform reliably. In parallel, our team is rolling out an upgraded design that is lighter, simpler, and incorporates thrust vector control.

Our team is the force that drives the propulsion 💎 💎 We're a highly skilled group with the experience and know-how to build the highest performance engines that maximize your value to orbit. And we have fun doing it! Here are a few of our great Launcher team members. If you're Interested in working on a one-of-a-kind rocket engine with our team, see our open roles at: vastspace.com/careers?depart…

Two E-2 development engines are fully assembled and undergoing test campaigns to validate reliability and service life. In parallel, our team is rolling out an upgraded design that is lighter, simpler, and incorporates thrust vector control. E-2 is ~75% 3D-printed by mass, produced in-house by our highly skilled manufacturing team. The highest performance LOX/kerosene engine in the small launch class is made in America 🇺🇸

@RJNance Yes. You can determine the payload of various rocket/engine configurations using our open source calculator: launcherspace.github.io/Launcher-Calcu…

@launcher So if my maths is right, 9 of these on a rocket could do 2000kg to LEO?

E-2 delivers unmatched performance in the small launch class. Operating at an optimal mixture ratio with 99%+ combustion efficiency, it produces a distinctive blue, transparent plume, which is unprecedented for kerosene engines. Designed for rapid reusability, E-2 maximizes specific impulse, increasing payload capacity and overall value to orbit. For a given rocket, higher engine performance enables more payload to be flown in place of propellant compared with lower performance engines. Propellants: LOX/Kerosene Thrust: 22k lbf (10 tf) Isp Sea Level: 290 s Isp Vacuum: 327 s Isp Vac Version: 365 s Cycle: Ox-Rich Staged Combustion

@TheRedstoneHive 46 and increasing with future versions

New engine test campaign kicked off! 💎💎 A trim test and a 200-second mission duty cycle test have been successfully completed on the latest brand-new E-2 engine unit, achieving a mixture ratio of 2.62 and a chamber pressure of 100 bar. Our thorough development program is critical to ensuring E-2 operates reliably and executes high-performance spaceflight missions at low cost. Propellants: LOX/Kerosene Thrust: 22k lbf (10 tf) Isp Sea Level: 290 s Isp Vacuum: 327 s Isp Vac Version: 365 s Cycle: Ox-Rich Staged Combustion

Twenty successful engine starts, totaling 2033 seconds of cumulative run time, were completed on the latest workhorse E-2 engine sample. This breakthrough test campaign concluded with a rapid relight demonstration, validating capabilities essential for reusability.  A brand-new engine sample has now been manufactured and is scheduled to begin testing early next week. E-2 continues to be pushed through its paces to ensure it will be fully prepared for future spaceflight missions, delivering high performance propulsion at low cost.   Propellants: LOX/Kerosene Thrust: 22k lbf (10 tf) Isp Sea Level: 290 s Isp Vacuum: 327 s Isp Vac Version: 365 s Cycle: Ox-Rich Staged Combustion

🚨 New record for E-2! 🚨 Last week we conducted an Endurance Demonstration Test Fire, setting a new record for the longest E-2 test to date at 222 seconds. Yesterday we followed it up with another 222-second run, achieving a mixture ratio of 2.75 and a chamber pressure of 101 bar. Thirteen successful engine startups totaling 1128 seconds of cumulative run time have been completed to date on the latest E-2 engine sample. Propellants: LOX/Kerosene Thrust: 22k lbf (10 tf) Isp Sea Level: 290 s Isp Vacuum: 327 s Isp Vac Version: 365 s Cycle: Ox-Rich Staged Combustion

New E-2 engine sample is rockin’ and rollin’ on the test stand! 💎💎 Nine successful engine startups totaling 869 seconds of cumulative run time have been completed to date on the latest E-2 engine sample, including an Endurance Demonstration Test Fire.  More soon... E-2 is the highest performance LOX/kerosene engine in the small launch class.

Throwback to the first 200-second E-2 test fire with our incredible partners at @NASAStennis on April 12, 2024. Since then, our team has completed 29 engine builds and test campaigns, each bringing us closer to a repeatable, reliable product. Our rigorous development program has been key to ensuring E-2 will be ready to execute spaceflight missions successfully, delivering high performance propulsion at a low cost.   Propellants: LOX/Kerosene Thrust: 22k lbf (10 tf) Isp Sea Level: 290 s Isp Vacuum: 327 s Isp Vac Version: 365 s Cycle: Ox-Rich Staged Combustion

Thirteen successful engine startups totaling 770 seconds of cumulative run time have been completed to date on the latest E-2 engine sample. Testing of this unit will continue to further characterize performance and extend the rated service life. E-2 is engineered to power spaceflight with rapid reusability and exceptional reliability at low cost. Propellants: LOX/Kerosene Thrust: 22k lbf (10 tf) Isp Sea Level: 290 s Isp Vacuum: 327 s Isp Vac Version: 365 s Cycle: Ox-Rich Staged Combustion

@anu_bonth Isp sea level: 290 sec Isp vacuum: 327 sec Isp vac version: 365 sec

@launcher Do you have ISP numbers?

This is what 99%+ combustion efficiency looks like for LOX/Kerosene.   Thanks to LOX cooling, E-2 doesn't require chamber film cooling.  Paired with a highly efficient injector, combustion efficiency and specific impulse are maximized, boosting payload capacity and unlocking more value from every mission to orbit.

E-2 making diamonds 💎💎💎 in the desert 🏜️ On September 15, 2025, our new engine unit completed its 6th test fire, a 202 sec full mission duty cycle with zero hardware issues.  E-2 manufacturing and test cadence are accelerating.

@PallottaPedro youtube.com/watch?v=iImKod…

@launcher When 4k on YT? Plz, make it happen!

E-2 has successfully demonstrated a full mission duty cycle with margin, completing a 201 sec run at our Mojave, CA test site. Multiple 200+ sec test fires have now been completed, proving performance and reliability across engine builds. As the highest performance LOX/kerosene engine in the small launch class, E-2 is designed to maximize your payload capacity and unlock more value from every mission to orbit.

At our Mojave, CA test site, E-2 ran at boosted thrust for a 1-minute duration, achieving 25,000 lbf thrust and measured 295 seconds Isp. Although E-2 is a kerosene/LOX engine, its plume is blue and transparent, demonstrating its 99%+ combustion efficiency. E-2 is now available for sale.

Launcher E-2 liquid rocket engine, 200-second test fire recorded Friday, April 12, 2024 at @NASAStennis - Youtube version in 4K: youtube.com/watch?v=mzX8nT…