Hydrazine Engine Start System Air Start Performance and Controls Sizing

Hydrazine has been used as an energy source in many applications to fuel in-flight main engine starting. In a current application, an existing hydrazine engine start system (ESS) design was adapted to meet new fuel control requirements. This paper presents a brief system description, historical context and the motivating factors for the hydrazine controls changes, and three case studies of controls design and analysis from the ESS program.