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RD-843 (РД-843)
Country of origin	Ukraine
First flight	2012-02-13
Designer	Yuzhnoye Design Bureau
Manufacturer	Yuzhmash
Application	Upper stage
Associated LV	Vega
Predecessor	RD-869
Status	In production
Liquid-fuel engine
Propellant	N2O4 / UDMH
Mixture ratio	2.0
Cycle	Pressure fed
Configuration
Chamber	1
Performance
Thrust, vacuum	2,452 newtons (551 lbf)
Chamber pressure	2.04 MPa (296 psi)
Specific impulse, vacuum	315.5 seconds
Burn time	Up to 667s
Dimensions
Dry mass	15.93 kilograms (35.1 lb)
Used in
	AVUM
References
References

The RD-843 is a Ukrainian single nozzle liquid propellant rocket engine burning pressure-fed UDMH and nitrogen tetroxide. It is rated for up to 5 restarts, and can gimbal up to 10 degrees in each direction.^[2]

It was developed by Yuzhnoye Design Bureau for Avio and is manufactured by Yuzhmash. It uses the RD-869 thrust chamber, the old Soviet ICBM SS-18 Satan final stage engine from which it is evolved, and which was also designed by Yuzhnoye. The RD-843 ground test campaign included 74 tests, 140 ignitions, reaching a total of 8201 s, which is approximately 12 service lives on 4 engines. As of June 2020 it has been successfully used on 14 orbital launches.^[5]

It is currently used as the main engine of Vega's AVUM upper stage.

References

^ "Liquid rocket engine RD-843". Yuzhmash. Retrieved 2015-05-29.
^ ^a ^b "RD-843". Yuzhnoye. Archived from the original on 2020-12-02. Retrieved 2015-05-29.
^ Degtyarev, Alexander; Kushnaryov, Alexander; Shulga, Vladimir; Ventskovsky, Oleg (2016-10-01). "Yuzhnoye's new liquid rocket engines as enablers for space exploration". Acta Astronautica. 127: 693–698. Bibcode:2016AcAau.127..693D. doi:10.1016/j.actaastro.2016.04.006.
^ "RD-843". Defense Industry Of Ukraine Products And Services. Retrieved 2016-07-11.
^ "Vega". 4 June 2020.