EngineBackground engines page

Engines the world can depend on

Masterfully tuned to an optimal balance of Performance, Reliability, and Cost

Our Engines

Everything you need to get there

Our engines are optimized to offer high performance, diverse capability, and unwavering reliability — all at a competitive price.

Staged Combustion
High-performing engine cycle in a compact design, innovating technology to its limit
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
Hadley Engine

In Production

Hadley

5,000

lbf

Ox-rich Staged Combustion

Thrust, Sea Level

Lox / Kerosene

Propellants

Reusable

Low Earth OrbitGeostationary OrbitIn-SpaceHypersonics

In Production

ursamajor draper web

in development

Draper

4,000

lbf

Closed Catalyst Cycle

Thrust, Sea Level

Hydrogen Peroxide/Kerosene

Propellants

Reusable

HypersonicsDefense

in development

Ripley Engine

In Development

Ripley

50,000

lbf

Ox-rich Staged Combustion

Thrust, Sea Level

Lox / Kerosene

Propellants

Reusable

Low EarthGeostationary Orbit

In Development

Arroway Engine Render

In Development

Arroway

200,000

lbf

THRUST, SEA LEVEL

Lox / Methane

PROPELLANTS

Reusable

Medium & Heavy Boost

In Development

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.

Measuring Tools

Fabrication

We leverage additive manufacturing (3D printing) to reduce overall part count, which reduces development time and allows for rapid redesign, manufacturing, and test iteration.

Engine Assembly

Testing

All Ursa Major engines are tested and developed at our in-house facility in Colorado, allowing for unmatched control over test scheduling.

Development & Test
Measuring Tools
Engine Assembly
Development & Test

Design

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

Fabrication

We leverage additive manufacturing (3D printing) to reduce overall part count, which reduces development time and allows for rapid redesign, manufacturing, and test iteration.

Testing

All Ursa Major engines are tested and developed at our in-house facility in Colorado, allowing for unmatched control over test scheduling.