High-performance propulsion

Liquid rocket engines and solid rocket motors optimized for high performance, diverse capability, and proven reliability.

The Ursa Major difference

Made to standards that set a new standard

We meticulously design, craft, and test our engines to achieve unmatched quality and reliability — and it’s all backed by the consistent stream of test data logged at our in-house facility.

Design

We use cutting-edge design techniques to create parts that simply couldn’t exist even ten years ago.

Fabrication

Additive manufacturing reduces overall part count and development time while allowing for rapid design, manufacturing, and iteration.

Testing

Ursa Major propulsion systems are developed and tested in-house, allowing for unmatched control over test scheduling.

Liquid rocket engines

Staged combustion

High-performing engine cycle in a compact design is our baseline

Reusability

Single engines capable of multi-mission use and extended duration applications

Thrust vector control

Precise gimbal maneuvering and control

Active throttle range

Allows for Max-Q throttling, g-limit throttling, and mission-specific thrust profiles

Single-mission restarts

Allows for efficient orbit-changing burns, de-orbit burns, and Stage 1 recovery

Custom burn duration

Allows for flexibility in mission planning and total impulse

Draper

In development: A flexible liquid engine with the storability of a solid motor

Suitable for tactical hypersonics, missile defense, in-space propulsion

Hydrogen Peroxide / Kerosene

Propellants

4,000 lbf

Thrust, Sea Level

Closed Catalyst Cycle

Hadley

In production: 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

In development: 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

In design: 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

Solid rocket motors

Driving speed and uniformity across motors with non-traditional manufacturing, as the U.S. faces a critical shortage in munitions.

Tactical, Defense, Hypersonics

Ursa Major solid rocket motor designs are optimized for manufacturing while delivering full performance.

Surge capability

Rapidly scale motor production leveraging common manufacturing production equipment and minimal tooling

Adaptability

One-click changeover to different casings on a single additive machine

Lower cost & fewer parts

Ursa Major’s processes have simplified the complex and labor-intensive process of motor manufacturing to reduce both part count and assembly tasks.

2-22" Diameter

Tailorable Thrust Profile

Composite Solid

Propellants

In-space Propulsion

Ursa Major is developing a modular, hydrazine in-space propulsion system offering customized degree-of-freedom satellite control.

Satellite Maneuverability

Leveraging Ursa Major's propulsion and manufacturing expertise to deliver reliability and redefine industry lead times, enabling rapid deployment of space-based capabilities.

Performance at Speed

In house designed and developed critical components including propellant tanks, avionics, and thrusters, are optimized for performance, mass, and lead time.

Mission Specific

Collaboration directly with customers to deliver a tailor-made propulsion solution for reliable use in LEO to GEO, and beyond.