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Land, Air, Sea, and Space: High-performing, American-built propulsion and defense systems to support U.S. dominance across all domains.

Powering the future of defense and aerospace

Ursa Major delivers mission-ready propulsion across missile defense, hypersonics, in-space mobility, and launch, leveraging additive manufacturing and modular architectures to produce scalable, flight-proven engines and SRMs faster than legacy providers. From throttleable, storable hypersonic engines to tactically responsive satellite propulsion and extended-range solid rocket motors, Ursa Major is powering the joint force with flexible, American-made propulsion for any mission, in any domain.

Ursa Major is flight-proven and scalable.

orbital launch growth rate in the last two years 

of all launch failures were caused by propulsion issues in the last 15 years. 

of the global propulsion supply dissolved in the Russia-Ukraine conflict.

$2.5B

For the United States and its allies, national security and space industry growth depend on access to reliable propulsion. But right now, demand is outpacing supply. 

Propulsion is an existential bottleneck 

The Solution

American-made, high-performing engines to solidify the U.S.’s leadership in space and defense today and for decades to come. 

As a storable evolution of the Hadley engine, Draper  provides a wide throttle range, multiple restarts, and mission flexibility to better address the evolving capabilities of our adversaries. 

Ursa Major Technologies 3d rendering of Draper Engine for Hypersonic and Defense. 

ursamajor draper web

Hydrogen Peroxide / Kerosene

4,000 lbf

Closed Catalyst Cycle

STORABLE AND FLEXIBLE FOR A RAPID RESPONSE 

Draper

Our one-of-a kind campus co-locates engineering, manufacturing, & testing operations, allowing for unmatched development time and the chance for employees, customers, and investors alike to experience rocket engine testing as a part of the normal work day.

America's first ox-rich staged combustion engine

Hadley Engine

Lox / Kerosene

Oxygen-rich

5,000 lbf

6,500 lbf

America's First Ox-Rich Staged Combustion Engine

Hadley

Ox-rich Staged Combustion

Hadley Full Height

Leveraging the manufacturing and design methodologies of Hadley, Ripley provides enhanced lox/kerosine propulsion capacity for an equally diverse set of vehicles. Ripley delivers industry-leading performance and power at a price point set to change the space launch industry.

Ripley Engine

50,000 lbf

Redefining small to medium class launch

Ripley

With a compact, fuel-rich staged combustion architecture using liquid oxygen and methane propellants, Arroway is the optimal balance of performance, simplicity, and versatility. Designed for U.S. national security missions, commercial satellite launches, orbital space stations, and future missions not yet conceived, the reusable, affordable Arroway engine is available for order now, slated for initial hot fire testing in 2023, and delivery in 2025.

Arroway Engine Render

Lox / Methane

Staged Combustion

200,000 lbf

America’s Next-Generation Heavy Launch Engine 

Arroway

launch-ready propulsion systems

Hadley Flight 3

Ursa Major Awarded $32.9M Contract to Deliver 16 Upgraded Hadley Engines

Ursa Major testing a HLG solid rocket motor at its headquarters.

Ursa Major Solid Rocket Motors

Ursa Major Validates SRM Manufacturing Process with Static Fires using HLG

Ursa Major x Stratolaunch approved photo of sustained hypersonic flight with historic first landing of hypersonic testbed vehicle

Ursa Major's Hadley Engine Hypersonic Flight

Ursa Major’s Hadley Engine Achieves Sustained Hypersonic Speeds

Draper Test Vehicle Graphic

AFRL awards UM $28.6M responsive space, hypersonic, on-orbit propulsion contract

Seeing aerospace advancement as a technological imperative, we’re accelerating the industry as the leading source of world-class propulsion systems.

Powering the future of defense and aerospace

The Mission

Ursa Major is flight-proven and scalable.

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