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; and NASA Jet Propulsion Laboratory (JPL) to capture satellite and spacecraft propulsion system information for an online database tool. The Spacecraft Chemical Propulsion Database (SCPD) is a new online central repository containing general and detailed system and component information on a variety of spacecraft propulsion systems. This paper only uses data that have been approved for public release with unlimited distribution. The data, supporting documentation, and ability to produce reports on demand, enable a researcher using SCPD to compare spacecraft easily, generate information for trade studies and mass estimates, and learn from the experiences of others through what has already been done. This paper outlines the layout and advantages of SCPD, including a simple example application with a few chemical propulsion systems from various NASA spacecraft. L IntroductionT HE goal of this database project is to capture historical data that are of interest for a variety of uses including, but not limited to, investigating design precedents: anchoring mass estimates and design approaches for concept and trade system studies: comparing propulsion system architectures and schematics: examining precedents and best practices: and understanding lessons learned. A fundamental objective of the Spacecraft Chemical Propulsion Database (SCPD) is to capture propulsion specific design and operational knowledge that is too frequently lost. SCPD contains data tables displayed in a tabular Web interface, bibliographic references, and design documentation on a variety of spacecraft propulsion systems. These systems may be Earth-orbiting satellites, interplanetary spacecraft, upper stage systems, interplanetary Landers. or transfer vehicles, including both human-rated and robotic spacecraft. Most of the spacecraft in SCPD have already flown, but the database may contain data for frilly integrated and tested systems that have not yet flown. The searchable database is currently limited to U.S.