The YF-23 is a liquid rocket vernier engine, burning N₂O₄ and UDMH.^[5] It is used in along the YF-22 to form the YF-24 and YF-25 propulsion modules.^[3][6][7][8]

Versions

The basic engine has been used since the Feng Bao 1 rocket and has been the vernier propulsion of the Long March 2, Long March 3 and Long March 4 families second stage.^[1][9][10]

• YF-23: Original version.
• YF-23B (AKA DaFY21-1): Improved version.^[9][11][12]
• YF-23F: Improved version.^[9]

Modules

This engine is bundled into modules along the YF-22 upper stage engine.^{[13][14][15][16]}

The relevant modules for second stage application are:

• YF-24: A module comprising an YF-22 and a single YF-23 verniers.
• YF-24B: A module comprising an YF-22B and a single YF-23B verniers.
• YF-24E: A module comprising an YF-22E and a single YF-23F verniers.^[17]

References

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