Tsyklon-4


The Tsyklon-4, also known as Tsiklon-4 and Cyclone-4, was a Ukrainian carrier rocket which was being developed for commercial satellite launches. Derived from the Tsyklon-3, it had a new third stage, a larger payload fairing, and a modernised flight control system compared to its predecessor. The control system had been developed by JSC Khartron.

Specifications

Tsyklon-4 was a three-stage-to-orbit expendable launch system, built on the successful Tsyklon-3 rocket and using improved versions of that rocket's first two stages. The new features were mostly in the newly developed third stage:
Tsyklon-4 would have improved the fuelling system, allowing safe capture of toxic vapours from the vehicle's hypergolic propellant system.
The launch system would have been able to deliver up to to a orbit, to a orbit, or to a geosynchronous orbit.

Development history

Development began in 2002, with the maiden flight aimed for 2006. Following a series of production delays, this launch date slipped, and was estimated to occur some time after 2015.
Tsyklon-4 had been planned to launch from a proposed launch pad at the Alcântara Launch Center in Brazil, which would have given the rocket access to all orbital regimes. However, Brazil backed out of the partnership with Ukraine in 2015, citing concerns over the project budget, the ongoing financial situation in both countries, and the future of the commercial launch market. Yuzhnoye began developing a two-stage derivative of Tsyklon-4, the Cyclone-4M, for Maritime Launch Services, a Canadian launch service provider. The new rocket is scheduled to be in service by 2020.