The DSI Small Satellite Launcher

Three DSI Launchers were used aboard the Discovery (STS-39) in May 1991 as part of the Infrared Background Signature Survey (IBSS). Each launcher successfully deployed a Chemical Release Observation (CRO) Sub satellite which were launched under the Complex Autonomous Payload (CAP) program, an outgrowth of NASA Goddard\u27s GAS program. Because the CRO subsatellites contained hazardous liquids (MMH, UDMH, and MON-lO) and were launched from GAS Cylinders without lids, the launchers were required to pass NASA Shuttle Payload safety and verification requirements. Some of the more interesting components of the design were the V-band retention and separation mechanism, the separation springs (surprisingly the dynamic response is dramatically different from the static), and the launcher electronics which provided a properly inhibited release sequence operated through the Small Payload Accommodations Switch Panel (SPASP) on board the Orbiter. The DSI launcher is space flight qualified hardware, has Space Shuttle flight heritage, and is available for use in the Small Satellite Community