|Manufacturer||Yuzhmash, JSC "Khartron" (control system)|
|Country of origin||Ukraine|
|Launch sites||Baikonur Site 90
Plesetsk Site 32
|First Stage - 11K69|
|Engines||1 RD-261 + RD-855 Vernier engine|
|Thrust||3,032 kilonewtons (682,000 lbf)|
|Specific impulse||298.21 sec|
|Burn time||119 seconds|
|Second Stage - 11S692|
|Engines||1 RD-262 + RD-856 Vernier engine|
|Thrust||941 kilonewtons (212,000 lbf)|
|Specific impulse||313.5 sec|
|Burn time||162 seconds|
|Specific impulse||330 sec|
|Burn time||450 sec|
The Tsyklon-4 or Cyclone-4, also known as Tsiklon-4, is a Ukrainian carrier rocket which is being developed for commercial satellite launches. Derived from the Tsyklon-3, it has a new third stage, a larger payload fairing, and a modernised flight control system compared to its predecessor. Control system has been developed by JSC Khartron.
Tsyklon-4 is a three-stage-to-orbit expendable launch system built on the successful Tsyklon-3 rocket and it uses its first two stages. The new features are mostly concentrated in the newly developed third stage:
- The third stage has a three times larger propellant capacity;
- The new rocket engine RD-861K with multiple ignition capability (3 to 5 times);
- A modern western-like control system capable of precise orbit injections;
- A new fairing derived from Ariane 4 is under development. It has a diameter of 4 meters, controlled temperature and cleanness conditions inside.
Tsyklon-4 will also improve the fueling system, allowing safe capture of toxic vapors from the Tsyklon's hypergolic propellant.
Tsyklon-4 will be launched primarily from the Baikonur and Plesetsk Cosmodromes. A preliminary attempt to develop a Ukrainian-Brazilian rocket launching center ended up in a big fiasco. Due to severe financial problems in the South American developing country and to strong political pressures from Russia, the project was cancelled in 2015.
|This section is outdated. (July 2015)|
Development began in 2002, with the maiden flight aimed for 2006. Following a series of production delays, this has slipped, and is now scheduled for sometime after 2015.
- Wade, Mark. "Tsyklon 4". Encyclopedia Astronautica.
- "Cyclone-4 Launch Vehicle". NPO InterCoS.
- Control systems for intercontinental ballistic missiles and launch vehicles
- Krivonosov, Khartron: Computers for rocket guidance systems
- "Cyclone 4". National Space Agency of Ukraine.