/sci/ - Science & Math

Another RLA 120
Glushko Project 1975
33 tons to LEO, 30 tons with booster recovery (parachutes for slow down, propulsive for touchdown, like Energia), Zenit derived booster, but the sustainer is a, air-starter 3.9m diameter (therefore railway-fitting) Hydrolox stage powered by 3*RD-57 (120t thrust, 455s isp), the booster engine was an early, less powerful definition of the RD-170 with less thrust (600 vs 800t).

Announced cost is 6.9 Million Ruble, 5.3 with Reuse, for comparison, a Soyuz-U, at the time, was around 2-3 Million; a Proton-K around 5-6 Million.