Engine Model: 11D43. Government Designation: 11D43. Designer: Glushko. Developed in: 1960-64. Application: UR-500 stage 1 original concept. Propellants: N2O4/UDMH. Thrust(vac): 1,642.000 kN (369,136 lbf). Isp: 316 sec. Isp (sea level): 285 sec. Burn time: 115 sec. Chambers: 1. Country: Russia. Status: Developed 1960-64. Low-expansion ratio gimbaled variant developed for UR-500 stage 1. In initial configuration 4 x 8D43 would be clustered with 4 x Glushko 11D43. Abandoned in favor of 6 x 11D48 by Glushko.
Bibliography:- Afanasyev, Igor, Novosti kosmonavtiki, "35 let RN Proton", 1998, Issue 5, page 40.