The Ikar upper stage is part of the Soyuz launch system upgrade policy. Built by TsSKB in Samara, this fourth stage is derived from an existing flight-proven module that has been used as a propulsion module of Yantar type satellites. Equipment and subsystems from the module are used to the maximum extent to limit new development. Modifications are primarily limited to some of command/control equipment and certain mechanical/electrical interfaces with the payload.
Ikar has a mass of 820 kg. and is located under the payload fairing. With an in-flight restart capability of up to 50 times, it can handle deployment of multi-satellite payloads to different orbits. The stage can be controlled from the ground or in an operate autonomous mode.
The stage is powered by a 17D61 engine from the KB Melnikov and has a vacuum thrust of 2943 kN. It operates on UDMH/N2O4 propellant and has 16 vernier engines for flight control.
|StageType / Application:||Manoeuvering stage|
|Fuel||UDMH / N2O4|
|Used with:||Soyuz-U Ikar|
No: Type: Date: LS Payload
1 Soyuz-U Ikar 09.02.1999 TB LC-1/5 Globalstar 23 / Globalstar 36 / Globalstar 38 / Globalstar 40 2 Soyuz-U Ikar 15.03.1999 TB LC-1/5 Globalstar 22 / Globalstar 37 / Globalstar 41 / Globalstar 46 3 Soyuz-U Ikar 15.04.1999 TB LC-1/5 Globalstar 19 / Globalstar 42 / Globalstar 44 / Globalstar 45 4 Soyuz-U Ikar 22.09.1999 TB LC-1/5 Globalstar 33 / Globalstar 50 / Globalstar 55 / Globalstar 58 5 Soyuz-U Ikar 18.10.1999 TB LC-1/5 Globalstar 31 / Globalstar 56 / Globalstar 57 / Globalstar 59 6 Soyuz-U Ikar 22.11.1999 TB LC-1/5 Globalstar 29 / Globalstar 34 / Globalstar 39 / Globalstar 61 TB Tyuratam / Baikonur F Failure P Partial Failure