Engine Model: RD-105. Manufacturer Name: RD-105. Government Designation: 8D71. Designer: Glushko. Developed in: 1952-54. Application: R-7 ICBM stage 1 (strap-on) initial project. Propellants: Lox/Kerosene. Thrust(vac): 627.600 kN (141,090 lbf). Thrust(sl): 539.000 kN (121,172 lbf). Isp: 302 sec. Isp (sea level): 260 sec. Burn time: 130 sec. Mass Engine: 782 kg (1,724 lb). Diameter: 1.20 m (3.90 ft). Length: 4.45 m (14.59 ft). Chambers: 1. Chamber Pressure: 58.80 bar. Area Ratio: 14.20. Oxidizer to Fuel Ratio: 2.70. Thrust to Weight Ratio: 81.84. Country: Russia. Status: Out of Production. Single chamber engine intended for the R-7 strap-ons. Subsequently replaced by the 4 chamber RD-107. Glushko was having difficulties in achieving stable combustion in a chamber of the size of the RD-105, which represented a huge scale-up from the ED-140 German-design 7 tonne thrust engine. In the beginning of the 1950's, various experimental chambers of 600 mm diameter were built, but Glushko was unable to achieve stable combustion. An increase in the payload specification of the R-7, requiring a 50% increase in thrust per stage, got him off the hook. At the end of 1954, he abandoned the RD-105 and instead used four more modest V-2-size chambers for the RD-107.
Bibliography:- Varfolomyev, Timothy, Spaceflight, "Soviet Rocketry that Conquered Space - Part 1", 1995, Volume 37, page 260.
- Glushko, V P, Albom Konstruktsiy ZhRD, Vol. 1 1968, Vol. 3 & 4 1969 via Dietrich Haeseler.
- Rakhmanin, V F, Odnazhdy i Navsegda, NPO Energomash, Moscow 1998 via Dietrich Haeseler.
- Michels, Juergen and Przybilski, Olaf, Peenemuende und seine Erben in Ost und West, Bernard & Graefe, Bonn, 1997.