Soyuz-2.1v

Soyuz-2.1v is a Russian light-lift launch vehicle developed by the Progress Rocket Space Centre in Samara. It is a modernized, simplified variant of the long-serving Soyuz-2 family, designed to fill a gap in Russia's ability to launch smaller payloads following the retirement of rockets like the Kosmos-3M. The vehicle features a unique two-stage configuration that omits the four strap-on boosters characteristic of other Soyuz rockets, relying instead on a powerful new first-stage engine.

Development and design

The development of the Soyuz-2.1v was initiated in the mid-2000s to create a cost-effective launch system for small satellites, responding to both domestic needs and the international commercial market. The design philosophy centered on maximizing commonality with the existing Soyuz-2.1b while introducing key innovations. The most significant change was the replacement of the traditional RD-107/RD-108 engine cluster with a single NK-33 engine, originally developed for the Soviet N1 Moon rocket, refurbished and redesignated the RD-193. This engine provides sufficient thrust without requiring liquid-fueled boosters. The second stage is the familiar Block I from the Soyuz-2.1b, powered by an RD-0124 engine. For missions requiring higher orbits, the rocket can be fitted with a Volga upper stage, derived from the Briz-KM. The vehicle's avionics and control systems are based on the modernized digital suite used across the Soyuz-2 series, representing a major upgrade from the analog systems of earlier Soyuz-U rockets.

Launch history

The maiden flight of the Soyuz-2.1v occurred on 28 December 2013 from Site 43 at the Plesetsk Cosmodrome, successfully deploying the Aist 1 satellite and two SKRL-756 calibration spheres. The second flight in December 2015 also from Plesetsk Cosmodrome was a partial failure; the Volga upper stage malfunctioned, stranding the Kanopus-ST satellite in a useless orbit. Subsequent launches have demonstrated high reliability, with missions originating from both Plesetsk Cosmodrome and, starting in 2022, the new Vostochny Cosmodrome. Notable payloads have included military reconnaissance satellites like Kosmos 2551 and Kosmos 2565, as well as civilian Earth observation satellites such as those in the Zorkiy series. As of April 2024, the rocket has conducted 12 launches with 11 full successes.

Technical specifications

The Soyuz-2.1v stands approximately 44 meters tall with a core diameter of 3.0 meters and a launch mass of about 158 tonnes. Its first stage is powered by a single NK-33/RD-193 engine, burning RP-1 and liquid oxygen and producing roughly 1,630 kN of thrust at sea level. The second stage uses an RD-0124 engine, generating about 294 kN of thrust in a vacuum. When equipped, the optional Volga upper stage utilizes a S5.92 engine burning UDMH and N2O4. The rocket can deliver up to 2,800 kg to a Low Earth orbit or approximately 1,400 kg to a Sun-synchronous orbit. Its guidance system is a modern digital computer, and the payload is enclosed within a standard Soyuz payload fairing.

Operational use and missions

Operationally, the Soyuz-2.1v is launched by crews from the Russian Aerospace Forces at state cosmodromes. Its primary role has been to deploy Russian military and governmental payloads, particularly smaller optical and radar reconnaissance satellites for the Ministry of Defence (Russia), such as the Kosmos series. It has also launched technology demonstration and scientific satellites, including the MKA-FKI series for the Russian Academy of Sciences. The rocket provides the Roscosmos State Corporation with a flexible, domestic light-lift capability, reducing reliance on foreign launch providers or aging Soviet-era rockets. Future missions are expected to continue supporting Russia's national security and scientific programs from both Plesetsk Cosmodrome and Vostochny Cosmodrome.

Variants and related rockets

The Soyuz-2.1v is a distinct member of the larger Soyuz rocket family, which includes the medium-lift Soyuz-2.1a and Soyuz-2.1b. Its closest relative is the Soyuz-2.1b, with which it shares the second stage. A proposed variant, sometimes referred to as Soyuz-2.1v/Volga, is the standard configuration for higher-energy missions. Conceptually, it fills a similar market niche as other international light-lift vehicles like the American Antares or European Vega, though it is derived from a much older and heavier lineage. Its development also shares a historical link to the N1 program through the reuse of the NK-33 engine technology.

Category:Launch vehicles Category:Soyuz programme Category:Russian space program