Upper stage / space tug - in production. Launched by Soyuz. Derived from propulsion module of Yantar spy satellite, over 30 flights to 1998. 50 restarts.

Ikar upper stage upgrades the Soyuz LV, replaces Block L; increased versatility due to capability for 50 restarts. Engine thrusts: 1 x 2943 N + 4 x 110 N + 4 x 52 N + 8 x 5.88 N.

Length: 2.56 m (8.39 ft). Basic Diameter: 2.72 m (8.92 ft). Span: 2.72 m (8.92 ft). Mass: 3,164 kg (6,975 lb). Main Engine: 17D61. Main Engine: 820 kg (1,800 lb). Main Engine Thrust: 2.940 kN (661 lbf). Main Engine Propellants: N2O4/UDMH. Main Engine Propellants: 2,344 kg (5,167 lb). Main Engine Isp: 326 sec.