YF-79

YF-79
Liquid-fuel engine
Country of origin	China
Designer	Beijing Aerospace Propulsion Institute
Associated LV	Long March 9
Predecessor	YF-75D
Status	In development
Propellant	Liquid oxygen / Liquid hydrogen
Mixture ratio	6.0
Cycle	Closed Expander Cycle
Configuration
Chamber	1
Nozzle ratio	160
Performance
Thrust, vacuum	250 kilonewtons (56,000 lb_f)
Chamber pressure	7.0 MPa (1,020 psi)
Specific impulse, vacuum	455.2 seconds (4.464 km/s)
Used in
Long March 9
References
References	^[1]^[2]^[3]^[4]

The YF-79 is a liquid cryogenic rocket engine burning liquid hydrogen and liquid oxygen in a closed expander cycle. It is China's fourth generation of upper stage cryogenic propellant engine, after the YF-73, YF-75 and the YF-75D. It can do multiple restarts thanks to an electric spark igniter and a prototype was tested at 60% and 100% (25 tonnes-force (250 kN; 25 LTf; 28 STf)) thrust levels in December 2021.^[1]

It will be used on the third stage of the Long March 9.

References

^ ^a ^b Xin, Zhang. "我国重型运载火箭25吨级膨胀循环氢氧发动机首台推力室挤压试验取得圆满成功" [First thrust chamber test firing of China's heavy launch vehicle 25-tonne hydrogen-oxygen expansion cycle engine a complete success] (in Chinese). Archived from the original on 2021-12-22. Retrieved 2021-12-22.
^ Brügge, Norbert (2021-12-22). "An overlook to China's new generation of Rocket Engines". B14643.de. Archived from the original on 2021-12-22. Retrieved 2021-12-22.
^ 崔荣军,何伟锋. "25吨级膨胀循环发动机技术方案研究". 导弹与航天运载技术2015年06期. Retrieved 2021-12-23.
^ 褚宝鑫,赵海龙,陈旭扬,龚杰峰 (2022-01-05). "25tf膨胀循环氢氧发动机研制进展" (in Simplified Chinese). 《火箭推进》2022年02期. Retrieved 2022-06-05.{{cite web}}: CS1 maint: multiple names: authors list (link)

External links

Engine Manufacturer

Rocket engines and solid motors for orbital launch vehicles

Comparison of orbital rocket engines

Liquid
fuel

Cryogenic

Hydrolox (LH₂ / LOX)	China YF-73 YF-75 YF-75D YF-77 YF-79 YF-90 Europe HM7B Vinci Vulcain India CE-7.5 CE-20 Japan LE-5 LE-7 LE-9 Russia KVD-1 (RD-56) RD-0120 RD-0146 United States BE-3U BE-7 J-2 RL10 RS-25 RS-68
Methalox (CH₄ / LOX)	China BF-20 Lingyun Longyun TQ-11 TQ-12 TQ-15A YF-209 YF-215 United States BE-4 Raptor Archimedes Aeon 1 Aeon R Russia RD-0169 Europe Prometheus M-10

Semi-
cryogenic

Kerolox
(RP-1 / LOX)

China
- TH-11
- TH-12
- YF-100
- YF-102
- YF-115
- YF-130
- Welkin
India
- SCE-200
Russia
- NK-15
- NK-33, 44
- RD-58
- RD-0105, 0109
- RD-0107, 0108, 0110
- RD-0110R
- RD-0124
- RD-107, 108, 117, 118
- RD-120
- RD-170, 171
- RD-180
- RD-191, 151, 181
- RD-193
- S1.5400
Spain
- TEPREL
Ukraine
- RD-8
- RD-801
- RD-810
United States
- F-1
- H-1
- Kestrel
- LR-79
- LR89
- LR105
- LR70-NA , S-3D
- Merlin
- RS-27
- RS-27A
- RS-56
- S-3D
- Rutherford
- XLR50

Storable

Hypergolic (Aerozine,
UH 25, MMH, or UDMH
/ N₂O₄, MON, or HNO₃)

China
Europe
- Aestus
- Astris
- Vexin
- Viking
India
- PS4
- Vikas
Israel
- LK-4
North Korea
- Paektusan LRE along other LREs
Russia
Ukraine
- RD-843
- RD-854, 861
- RD-855
- RD-856
- RD-864, 869
United States
- AJ10
- LR-87
- LR-91
- RS-88*
- TR-201
- XLR81*

Other

Russia
- RD-109, 119
- RD-211 to 214
UK
- Gamma
United States
- Curie
- RS-88*
- XLR81*

Solid
fuel

China
- FG-02
- FG-36
- FG-46
- FG-47
- SpaB-65
- SpaB-140C
Europe
- Mage 1
- P-4
- P-6
- PAP
- P80
- P120C
- P230
- Topaze
- Waxwing
- Zefiro 9
- Zefiro 23
- Zefiro 40
India
- S7
- S9
- S12
- S139
- S200
Iran
- Salman
- Rafe
Israel
- LK-1
- RSA-3
Japan
- KM-V1
- KM-V2b
- M-14
- M-24
- M-34
- M-34c
- SRB-A
United States
- AJ-60A
- Algol
- Castor 30
- GEM
- Orbus-6
- Orbus-21
- Orion
- Space Shuttle SRB
- Star 37
- Star 48
- UA120
- SRMU
- X-248
- X-254

* Different versions of the engine use different propellant combinations
Engines in italics are under development

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