SCALING UP SPACE PROPULSION PRODUCTION

This paper presents Dawn Aerospace’s transition from prototype-based development to low-volume serial production of advanced green propulsion systems. Over the past years, Dawn has evolved from delivering one to two flight systems per year to at least four complete propulsion systems per month, while maintaining high quality, traceability, and customer responsiveness. This transformation coincides with the rapid expansion of flight heritage, with 23 propulsion systems launched in 2025, demonstrating that lean methodologies can be effectively applied to high-performance aerospace manufacturing at low production volumes.

The paper describes the implementation of lean practices across Dawn’s propulsion development and production lifecycle, focusing on waste elimination, workflow standardization, and the establishment of pull-based processes. Key enablers include digitized quality assurance workflows, real-time production dashboards, and structured product lifecycle management covering qualification, supplier engagement, and customer interfaces. The move to standardized digital records has improved traceability, reduced lead times, and simplified configuration management across multiple propulsion variants.

Challenges encountered during the transition are discussed, including balancing R&D flexibility with production discipline, ensuring consistency across small-batch manufacturing, and upskilling a multidisciplinary team without constraining engineering creativity. Through iterative refinement of procedures, Dawn has established a sustainable framework for continuous improvement aligned with internal manufacturing objectives and external mission assurance requirements.

Two case studies are presented: the 0.8U CubeDrive, a compact integrated propulsion module for CubeSat-class spacecraft, and the SatDrive 5 kN·s system, a larger propulsion assembly for microsatellite and ESPA-class missions. Both demonstrate the benefits of lean integration, including reduced process variability, improved throughput, and significantly lower non-conformance rates. Notably, Dawn achieved fewer than one system-level non-conformance per delivered propulsion unit on average while increasing delivery cadence.

The paper concludes with recommendations and an outlook on applying lean principles in low-volume aerospace production, providing a framework for scaling complex manufacturing while sustaining innovation and reliability.