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retropropulsion.bsky.social
@retropropulsion.bsky.social
RM-81 Lockheed Agena (1959)
Bell Aerospace XLR-81

The Agena served as a reliable upper stage and spacecraft bus, with over 365 launched. Each Agena was powered by a single XLR-81 engine burning UDMH and Red Fuming Nitric Acid.
March 25, 2025 at 5:39 AM
Galileo Spacecraft (1989)
Boeing Inertial Upper Stage

Solid rocket motor designed to raise the orbits for Space Shuttle deployed missions
February 12, 2025 at 5:41 AM
Viking Lander Engine (1975)
Rocket-Research MR-80B

Showerhead nozzles to reduce surface impingement
February 11, 2025 at 4:35 AM