The YF-23 is a liquid rocket vernier engine, burning N2O4 and UDMH. It is used in along the YF-22 to form the YF-24 and YF-25 propulsion modules.
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This article is an automated import of the Wikipedia article "YF-23 (rocket engine)", available at https://en.wikipedia.org/wiki/YF-23_(rocket_engine) . Text is licensed under CC BY-SA 4.0.