RD-8

RD-8 (РД-8)
Country of origin	Soviet Union
First flight	April 13, 1985
Designer	Yuzhnoye Design Bureau
Manufacturer	Yuzhmash
Application	Second Stage Vernier
Associated LV	Zenit
Successor	RD-809M
Status	In Production
Liquid-fuel engine
Propellant	LOX / RG-1
Mixture ratio	2.4
Cycle	Staged Combustion
Configuration
Chamber	4
Performance
Thrust, vacuum	78.45 kN (17,640 lbf)
Chamber pressure	7.747 MPa (1,123.6 psi)
Specific impulse, vacuum	342 s (3.35 km/s)
Burn time	1100 s
Gimbal range	±33°
Dimensions
Length	1,500 mm (59 in)
Diameter	4,000 mm (160 in)
Dry weight	380 kg (840 lb)
Used in
	Zenit family second stage
References
References

The RD-8 (Russian: РД-8 and GRAU Index: 11D513) is a Soviet / Ukrainian liquid propellant rocket engine burning LOX and RG-1 (a rocket grade kerosene) in an oxidizer rich staged combustion cycle.^[5]^[6] It has a four combustion chambers that provide thrust vector control by gimbaling each of the nozzles in a single axis ±33°.^[2] It was designed in Dnipropetrovsk by the Yuzhnoye Design Bureau as the vernier thruster of the Zenit (GRAU: 11K77) second stage.^[7] As such, it has always been paired with the RD-120 engine for main propulsion.^[8]^[1]

It can only be started once, and as a high altitude engine it has a thrust of 78.45 kN (17,640 lb_f) and a specific impulse of 342 s (3.35 km/s).^[5]^[6] It is the first ever steering engine to use the staged combustion cycle, and as such is the basis for a family of planned engines for the Mayak launch vehicle family.^[3]

The engine itself is built like a hollow cylinder, with a cylindrical space in the center so the RD-120 nozzle can pass through.^[9]

^ ^a ^b Cite error: The named reference gunter-zenit was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference b14643-ukrainepropulsion was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference khai-aktt201301p4450 was invoked but never defined (see the help page).
^ Cite error: The named reference ukrspexport-rd8 was invoked but never defined (see the help page).
^ ^a ^b ^c Cite error: The named reference yuzhnoye-rd8 was invoked but never defined (see the help page).
^ ^a ^b ^c Cite error: The named reference yuzhmash-rd8 was invoked but never defined (see the help page).
^ Cite error: The named reference aviadvigatel was invoked but never defined (see the help page).
^ Cite error: The named reference hendrickx2007p80 was invoked but never defined (see the help page).
^ Cite error: The named reference rsw-zenitstage2 was invoked but never defined (see the help page).

[gunter-zenit-1] Cite error: The named reference gunter-zenit was invoked but never defined (see the help page).

[b14643-ukrainepropulsion-2] Cite error: The named reference b14643-ukrainepropulsion was invoked but never defined (see the help page).

[khai-aktt201301p4450-3] Cite error: The named reference khai-aktt201301p4450 was invoked but never defined (see the help page).

[ukrspexport-rd8-4] Cite error: The named reference ukrspexport-rd8 was invoked but never defined (see the help page).

[yuzhnoye-rd8-5] Cite error: The named reference yuzhnoye-rd8 was invoked but never defined (see the help page).

[yuzhmash-rd8-6] Cite error: The named reference yuzhmash-rd8 was invoked but never defined (see the help page).

[aviadvigatel-7] Cite error: The named reference aviadvigatel was invoked but never defined (see the help page).

[hendrickx2007p80-8] Cite error: The named reference hendrickx2007p80 was invoked but never defined (see the help page).

[rsw-zenitstage2-9] Cite error: The named reference rsw-zenitstage2 was invoked but never defined (see the help page).

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