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Propulsion to, in,
and beyond orbit

From liftoff to low Earth orbit, Ursa Major’s satellite propulsion, space-based defense, and launch systems move faster, fly farther, and adapt to the evolving threat landscape–delivering resilient space operations and true freedom to maneuver.

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In-Space PR

In-Space Mobility

Ursa Major’s modular, hydrazine-based satellite propulsion system delivers tactically responsive, highly maneuverable control for dynamic operations in orbit. Designed for mission flexibility from LEO to GEO and beyond, our monopropellant system is highly maneuverable and optimized for custom burn durations in the vacuum of space.  

With in-house development of critical components, including the propellant tanks, avionics, and thrusters, we minimize lead times through ensuring a resilient, scalable supply chain and productized components. Whether maneuvering to avoid threats, repositioning for rapid response, or extending satellite lifespan, Ursa Major’s in-space propulsion unlocks high-performance mobility tailored to mission needs. 

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Space-Based Defense

The Draper liquid rocket engine is designed for tactical hypersonic applications, missile defense missions, and in-space rapid maneuverability. This storable propulsion system offers the same launch readiness and storability as a solid rocket motor, with the added benefits of restart capability, unique mobility and range, as well as active throttle control with the flexibility to support new mission profiles. 

With tactical storability and cost-effective manufacturing, solid rocket motors developed via LYNX, Ursa Major’s Mixed Model Manufacturing approach, are ideal for space-based defense systems. This production infrastructure supports SRM manufacturing through product-agnostic tooling systems across a range of diameter classes, enabling versatile responsiveness to defense needs and a streamlined path to qualification. 

Launch Engines

Hadley
Ripley
Arroway

Hadley

America’s first oxygen-rich staged combustion engine

Suitable for small launch, hypersonics.

Propellants
Lox / Kerosene
Cycle
Oxygen-Rich Staged Combustion
Thrust, Sea Level
5,000 lbf
Thrust, Vacuum Variant
6,500 lbf
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Ripley

High performing kerosene engine.

Suitable for small to medium commercial launch.

Propellants
Lox / Kerosene
Cycle
Oxygen-Rich Staged Combustion
Thrust, Sea Level
50,000 lbf
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Arroway

Advanced engine suitable for heavy and national security launch.

Propellants
Lox / Methane
Cycle
Full-Flow Staged Combustion
Sea Level Thrust
65,000-300,000+ lbf
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Launch

Liquid Rocket Engines with

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

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