Engine Model: RD-866. Manufacturer Name: RD-866. Government Designation: 3D65. Designer: Yuzhnoye. 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.
RD-866 used on Rocket Stages
Bibliography:- Zhelyez x-plane book,
- Lardier, C, Air et Cosmos, "SS-18", 2 Sept. 1994 via Dietrich Haeseler.
- Siddiqi, Asif A, Soviet Space Web Page, 1999 via Dietrich Haeseler. Web Address when accessed: http://home.earthlink.net/~cliched/main_space.html.
- Shnyakin, V N, Shidkostnye Raketye Dvigateli - Opisanie i Osnovnye Tekhnicheskie Dannye, GKB Yuzhnoe "Yangel", Dnepropetrovsk 1996 via Dietrich Haeseler.
