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High-Performance Cryogenic
Orbit Transfer Stage

Powered by the Mjölnir full flow staged combustion engine - with the highest specific power of any chemical rocket thermodynamic cycle
Key Benefits

The high-performance engine enables the design of a small and lightweight Orbital Transfer Stage (OTS) due to both its performance and the high bulk density of LOX/LNG fuel, which is over twice that of LOX/LH2 fuels. This level of performance and dense propellants allow delivery of a reliable, long-life, light-weight, and low-cost OTS with key performance parameters:

  • Powered by a high-performance full-flow staged combustion engine.

  • Throttleable from 30% to 100% thrust.

  • Autogenous pressurization with unlimited zero-g restarts. 

  • Access to all cislunar orbits.



Mjölnir has the potential to be an expendable NASA OTS evolving into a lunar lander and a fully reusable OTS. From LEO a 3,000 lb gross OTS can deploy a 400 lb payload to GEO and over 200 lbs to any location in cislunar space, including Earth escape velocity. 


A 3,000 lb OTS also has potential military applications by enabling responsive military space domain awareness throughout cislunar space.


The OTS has a small form factor optimized for launch inside the fairing of venture-class vehicles.

The Mjölnir engine will be available for OTS, lunar lander, or related capabilities in 2024.

Download the factsheet.

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