Parabilis Space Technologies recently announced the successful hot-fire testing and delivery of its Dense Orbital Transfer System (DOTS) prototype to Space Systems Command’s System Delta 89, with support from the Space Force‘s Space Combat Power Portfolio Acquisition Executive. The 2U-scale DOTS prototype, a fully integrated CubeSat-scale modular propulsion system that is roughly the size of a household toaster (8” x 4” x 4”), met or exceeded all program objectives while delivering dramatic improvements over existing CubeSat propulsion technologies.
Compared to current state-of-the-art systems, DOTS provides a multi-fold increase in higher thrust, (from typically only a few ounces to multiple pounds of force), and double-digit percentage improvements in Delta-V capability, specific impulse and total impulse.
“The successful hot fire of the DOTS prototype underscores the value of innovative industry partnerships that give us access to cutting-edge space technologies that directly advance U.S. space superiority objectives,” said USSF Col. Scott Klempner, acting Space Force portfolio acquisition executive deputy for Space Combat Power.
The DOTS prototype leverages Parabilis’ solid-liquid hybrid engine technology, featuring a plastic motor with a high-concentration hydrogen peroxide oxidizer. This safe, non-toxic approach simplifies handling and integration for CubeSat providers, accelerating deployment while enabling the system’s breakthrough thrust and maneuverability.
“By achieving orders-of-magnitude higher thrust and improved efficiency while meeting all program objectives, DOTS delivers a clear leap in CubeSat propulsion performance,” said Enrico Attanasio, president and CEO of Parabilis Space Technologies, Inc. “This milestone reflects the effectiveness of our hybrid propulsion architecture and positions small satellites for truly responsive, mission-critical operations. We look forward to seeing these capabilities enable the next generation of dynamic space missions.”
The DOTS engine thrust accelerates 6U CubeSats significantly, boosting current Delta-V capability to hundreds of meters per second (over 1000 mph) in just a few minutes. This advanced capability provides small satellites with the essential speed to maneuver decisively, evade threats and execute dynamic repositioning swiftly. In addition to the successful live hot-fire test of the fully integrated system, every major component was individually tested and characterized. DOTS is expandable in size, enabling high thrust across the full CubeSat class of vehicles, payloads and missions.
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