The restartable Agena engine relit after coast - did the spy payload live?
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The restartable Agena engine relit after coast - did the spy payload live?
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The restartable Agena engine relit after coast - did the spy payload live?
In this episode, we trace the Agena from a cancelled weapons project to a standardized orbital workhorse and follow its role carrying both NASA experiments and secret military payloads. What happened on the flight when the engine reignited after coast, and what did it mean for the classified satellite it carried?
Person: Lawrence Edwards
Date: 1959-1987 (program flight history)
Location: Earth orbit
Topic: Agena restartable engine and classified payloads
- The Agena evolved from the cancelled Weapons System 117L upper stage, repurposed and built by Lockheed.
- The Agena-B introduced the near-miraculous capability to restart its Bell 8096-derived engine after coasting in orbit.
- The Bell 8096 lineage traces back to engineering work on a cancelled rocket-propelled nuclear warhead pod, including propellant chemistry of IRFNA and UDMH.
- In 1962, Lawrence Edwards pushed to standardize the design, producing the Agena-D which flew unchanged for 25 years.
- Of 365 flights, 33 carried NASA payloads with public records; 332 carried classified military payloads whose records remain largely sealed.
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