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X-37 Storable Propulsion System Design and OperationsIn a response to NASA's X-37 TA-10 Cycle-1 contract, Boeing assessed nitrogen tetroxide (N2O4) and monomethyl hydrazine (MMH) Storable Propellant Propulsion Systems to select a low risk X-37 propulsion development approach. Space Shuttle lessons learned, planetary spacecraft, and Boeing Satellite HS-601 systems were reviewed to arrive at a low risk and reliable storable propulsion system. This paper describes the requirements, trade studies, design solutions, flight and ground operational issues which drove X-37 toward the selection of a storable propulsion system. The design of storable propulsion systems offers the leveraging of hardware experience that can accelerate progress toward critical design. It also involves the experience gained from launching systems using MMH and N2O4 propellants. Leveraging of previously flight-qualified hardware may offer economic benefits and may reduce risk in cost and schedule. This paper summarizes recommendations based on experience gained from Space Shuttle and similar propulsion systems utilizing MMH and N2O4 propellants. System design insights gained from flying storable propulsion are presented and addressed in the context of the design approach of the X-37 propulsion system.
Document ID
Document Type
Conference Paper
Rodriguez, Henry
(Boeing Aerospace Co. Huntington Beach, CA, United States)
Popp, Chris
(Boeing Aerospace Co. Huntington Beach, CA, United States)
Rehegan, Ronald J.
(Boeing Co. FL, United States)
Date Acquired
August 23, 2013
Publication Date
January 1, 2006
Subject Category
Propellants And Fuels
Meeting Information
53rd Joint Army Navy Nasa Air Force Joint Propulsion Meeting(Monterey, CA)
Funding Number(s)
Distribution Limits
Work of the US Gov. Public Use Permitted.
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