Solutions for commercial space
Liftoff without the heavy lifting
The Problem
Propulsion is notoriously difficult and expensive.
For decades, the U.S. aerospace and defense industry has faced two problematic choices for propulsion: build engines in-house—which can take 5-10 years and hundreds of millions of dollars—or buy outdated or foreign technology.
Propulsion accounts for
50%
Of launch failures
60%
Of vehicle costs
90%
Of vehicle complexity
The Approach
Get to the launch pad faster
With high-performing, turnkey rocket engines, Ursa Major focuses exclusively on propulsion so you don't have to.
80% of engines' mass is 3D printed for quick iteration, part commonality, and shorter build timelines.
Oxygen-rich staged combustion cycle as our baseline is a higher performing architecture at a fraction of the cost of traditional engine programs.
80,000+ seconds of runtime in testing for proven reliability and performance.
Built with reusability in mind.
Missions We Serve
Launch
Flexible engines for small, medium, and heavy launch vehicles.
Hypersonic testbeds
Accelerate the pace of hypersonic testing, without relying on a wind tunnel.
In-space
Reliable propulsion capable of multiple restarts and a custom burn duration within the vacuum of space.
Hadley
America’s first oxygen-rich staged combustion engine
Suitable for small launch, hypersonics
Lox / Kerosene
Propellants
Oxygen-rich
staged combustion
5,000 lbf
Thrust, Sea Level
6,500 lbf
THRUST, VACUUM VARIANT
Ripley
Highest performing kerosene engine ever built in the U.S.
Suitable for small to medium commercial launch
Lox / Kerosene
Propellants
Oxygen-rich
staged combustion
50,000 lbf
Thrust, Sea Level
Arroway
The future of American engines for heavy lift
Suitable for medium to heavy launch, national security launch, RD-180 replacement
Lox / Methane
PROPELLANTS
Staged Combustion
200,000 lbf
Thrust, Sea Level
Latest News
Ursa Major Hadley Engine Flies for the First Time
Ursa Major's Hadley engine, a purpose-built engine to satisfy America's commercial and national security space needs, flew for the first time powering Stratolaunch's Talon-A1 (TA-1) testbed during a test over the Pacific Ocean. The test, which reached high supersonic speeds approaching Mach 5, marks the first step toward flight of a hypersonic vehicle developed by a private company.
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