YF-23 (rocket engine)

YF-23E

Country of origin	China
First flight	1974-11-05
Designer	Academy of Aerospace Liquid Propulsion Technology
Application	Vernier engine
Associated L/V	Feng Bao 1, Long March 2, Long March 3 and Long March 4
Status	In Production
Liquid-fuel engine
Propellant	N2O4 / UDMH
Mixture ratio	1.57
Configuration
Chamber	4
Performance
Thrust (vac.)	47.1 kN (10,600 lbf)
Isp (vac.)	297 seconds (2.91 km/s)
Burn time	300s
Used in
Long March 2F, Long March 3A, Long March 3B, Long March 3C, Long March 4B and Long March 4C second stage.
References
References	[1][2][3][4]

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

1. Norbert Bgügge. "Asian space-rocket liquid-propellant engines". B14643.DE. Retrieved 2015-07-15.
2. "Long March". Rocket and Space Technology. Retrieved 2015-07-08.
3. "YF-23". Encyclopedia Astronautica. Retrieved 2015-07-15.
4. Sutton, George Paul (November 2005). "Liquid Rocket Propellant Engines in the People's Republic of China". History of Liquid Propellant Rocket Engines. AIAA. p. 873. ISBN 978-1563476495. Retrieved 2015-07-15.
5. Harvey, Brian (2004). "Launch Centers Rockets and Engines". China's Space Program — From Conception to Manned Spaceflight. Springer Science & Business Media. p. 232. ISBN 978-1852335663. Retrieved 2015-07-15.
6. "YF-22/23". Encyclopedia Astronautica. Retrieved 2015-07-15.
7. "YF-22A/23A". Encyclopedia Astronautica. Retrieved 2015-07-15.
8. "YF-25". Encyclopedia Astronautica. Retrieved 2015-07-15.
9. Norbert Bgügge. "YF rocket engine history". B14643.DE. Retrieved 2015-07-15.
10. Norbert Bgügge. "Propulsion FB-1". B14643.DE. Retrieved 2015-07-15.
11. "Chapter 2 — General Description to LM-2E". LM-2E User's Manual. Issue 1999 (pdf). CASC. 1999. pp. 2–2. Retrieved 2015-07-08.
12. "Chapter 2 — General Description to LM-3B". LM-3B User's Manual. Issue 1999 (pdf). CASC. 1999. pp. 2–2. Retrieved 2015-07-08.
13. Norbert Bgügge. "Propulsion CZ-2, CZ-2C, CZ-2D". B14643.DE. Retrieved 2015-07-15.
14. Norbert Bgügge. "Propulsion CZ-3, CZ-3A CZ-3B, CZ-3C". B14643.DE. Retrieved 2015-07-15.
15. Norbert Bgügge. "Propulsion CZ-4A, CZ-4B, CZ-4C". B14643.DE. Retrieved 2015-07-15.
16. Harvey, Brian (2013). "Chapter 3 — The Program". China in Space — The Great Leap Forward. Springer Science & Business Media. p. 87. ISBN 978-1461450436. Retrieved 2015-07-15.
17. "2.3 LM-3B and LM-3BE Launch Vehicles". LM-3A Series Launch Vehicle User's Manual. Issue 2011 (pdf). CASC. 2011. pp. 2–16. Retrieved 2015-07-08.