Redwire Secures $20M DARPA Award for VLEO Air-Breathing Propulsion
Redwire has secured a $20 million DARPA contract under the Otter program to test air-breathing electric propulsion tech, aiming to operationalize the Very Low Earth Orbit regime.
Low-Altitude Dominance
Redwire ($RDW) has reinforced its position in the emerging Very Low Earth Orbit (VLEO) sector. According to Payload, the firm secured a $20 million DARPA contract to advance the agency’s Otter program. This initiative focuses on air-breathing electric propulsion (ABEP), a technology designed to sustain operations between 90 km and 250 km—an altitude where atmospheric drag typically terminates conventional orbital missions.
The Subscale Precursor
This new funding follows a larger $44 million Phase 2 award granted in November 2025. The current $20 million allocation is dedicated to a subscale precursor mission utilizing a modified version of Redwire’s SabreSat platform. Slated for late 2027, the flight will last less than 24 hours. The objective is to gather critical empirical data on ABEP performance that cannot be replicated in terrestrial laboratories, thereby reducing risk for the subsequent full-scale Otter demonstration.
Strategic Implications
DARPA’s interest in VLEO is driven by the need for tactical responsiveness and proximity-based reconnaissance. By harvesting atmospheric particles to generate thrust, ABEP-equipped satellites can maintain persistent, maneuverable presence in regimes previously considered unreachable for long-term deployments.
Redwire is currently managing dual tracks for this technology. While the DARPA effort services U.S. national security, Redwire is also the prime contractor for the European Space Agency’s (ESA) Skimsat mission. Despite different regulatory frameworks, Redwire aims to apply universal digital engineering tools across both programs. Skimsat is also targeting a 2027 launch, positioning VLEO as a critical new frontier for European and American space infrastructure.