RD-866

RD-866
Credit - Yuzhnoye

Manufacturer Name: RD-866. Government Designation: 3D65. Designer: Yangel. Developed in: 1980-83. Application: RT-23 / RS-22 (SS-24) MIRV-bus. Propellants: N2O4/UDMH. Thrust(vac): 5.200 kN (1,169 lbf). Isp: 306 sec. Burn time: 330 sec. Mass Engine: 125 kg (276 lb). Diameter: 1.98 m (6.49 ft). Length: 1.19 m (3.89 ft). Chambers: 1 + 16. Chamber Pressure: 40.70 bar. Oxidizer to Fuel Ratio: 2.03. Thrust to Weight Ratio: 4.22. Country: Ukraine. Status: Out of Production.

The RD-866 engine powered the MIRV distribution bus. The engine provided:

delivery of fuel delivery to the steering units used for missile flight control at the end of the first stage burn and during the second and third stage engine burns
roll control during third stage burn
during dispensing of multiple independently targeted warheads, provision of attitude and translation forces in multiple burns of the main engine and peripheral thrusters
fuel delivery to the hydraulic actuators that gimbaled the main engine during warhead distribution

The multifunction engine operated under a generator scheme. Propellants were fed under a combined scheme (pressure-fed and pump delivery). A broad range of flow-rates and pressures were provided according to the engine mode. The engine consisted of a centralized propellant supply source composed of two turbopumps with gas generators and two feeders; a single chamber main engine; and 16 liquid thrusters for attitude control and translation. Overall vacuum thrust of between minus 926 KN to plus 5036 kN could be provided at a mean specific impulse of 305.5 seconds for the design dispensing profile. The thrusters could be fired in continuous or 10 Hz pulsed modes.

Summary: One main and 16 control thrusters. 5.20 kN + 16 x 116 N. Chamber pressure 40.7 / 5.56 bar. Specific impulse 305.5 / 245 sec. Burn time 330 / 1200 sec. Oxidizer to fuel ratio 2.03 / 1.85.

Bibliography and Further Reading

Siddiqi, Asif A, Soviet Space Web Page, 1999 via Dietrich Haeseler. Asif Siddiqi presents material that could not be fit into his monumental 'Challenge to Apollo'. Accessed at: http://home.earthlink.net/~cliched/main_space.html.

Zhelyez x-plane book, .

Lardier, C, Air et Cosmos, "SS-18", 2 Sept. 1994 via Dietrich Haeseler.

Shnyakin, V N, Shidkostnye Raketye Dvigateli - Opisanie i Osnovnye Tekhnicheskie Dannye, GKB Yuzhnoe "Yangel", Dnepropetrovsk 1996 via Dietrich Haeseler.

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