Changing the Way We Move in Space

ABOUT PHASE FOUR

At Phase Four, we develop and produce next generation electric propulsion systems for satellites. Our mission is to change the way we move in space by bringing a reliable, mass-manufactured supply of electric propulsion to the growing market, and by introducing new, propellant-agnostic electric propulsion systems to enable new ways to move in space. Phase Four propulsion systems have been flying on multiple commercial missions since 2021.

Learn More

Phase Four Partners with Redwire to Expand Space Propulsion Offerings and Deliver Hall Effect Thrusters

Redwire and Phase Four will design and develop a reliable and efficient Hall Effect Thruster (HET), called the Valkyrie Thruster, based on an existing design. The highly flexible and streamlined design will yield a shorter production schedule enabling reliable, high-volume production.

Read More
LEW-17678-1_hall-thruster_ftb

Photo courtesy of NASA

P4 Favicon

PRODUCTS

Valkyrie Thruster

Valkyrie is a next generation Hall Effect Thruster designed to deliver a high performance solution to proliferated satellite constellations. Developed in partnership with Phase Four, the Valkyrie thruster is anticipated to go into full-rate production in 2025.

GET SPECIFICATIONS

RECENT NEWS

Read more about us and updates in the news.

Read More
University of Oklahoma Partners with Space Technology Company Phase Four

November 14, 2024

Representatives of the University of Oklahoma signed a memorandum of understanding at the Oklahoma Aerospace Forum on Tuesday with California-based Phase Four, Inc. to advance collaborative research involving space propulsion technologies.
Read More →
Bridenstine Kicks Off Phase Four Investment Round

November 11, 2024

Former NASA administrator Jim Bridenstine is making his first investment in a space company, backing the satellite propulsion company Phase Four’s latest fundraising round.
Read More →
Phase Four Announces Monopropellant Multi-Mode Propulsion Systems

October 22, 2024

Phase Four, a leading provider of next-generation electric propulsion (EP) solutions for satellites, announced the planned commercialization of their monopropellant multimode capability.
Read More →

CONTACT

We'd love to learn more from you. Please use the contact form to the right to get in touch with us, or a specific team, and we will get back to you as soon as we can!