R-29RMU2 Layner

R-29RMU2.1 Liner
Type	Submarine-launched ballistic missile
Place of origin	Russia
Service history
In service	2014
Used by	Russian Navy
Production history
Designer	Makeyev Rocket Design Bureau
Manufacturer	Krasnoyarsk Machine-Building Plant
Specifications
Weight	40 tons
Length	15 m
Diameter	1.9 m
Warhead	12
Engine	Three-stage liquid propellant
Operational range	8,300-12,000 km
Guidance system	Astroinertial with GLONASS

The R-29RMU2.1 Lajner (Russian: Р-29РМУ2 "Лайнер" meaning Liner) is a Russian liquid-fuelled submarine-launched ballistic missile (SLBM) developed by the Makeyev Rocket Design Bureau and produced by the Krasnoyarsk Machine-Building Plant. Derived from the R-29RMU Sineva SLBM, the Layner can carry twelve nuclear warheads, three times as many as Sineva. It was expected to enter service with the Russian Navy's Delta IV class submarines after a successful test programme that spanned from May to September 2011. The Russian Navy confirmed in 2014 that the system was now in use.

History and design

On 9 August 2011, the Russian Ministry of Defense disclosed the details of the Layner SLBM, whose first launch occurred on 20 May earlier that year. The authorities originally claimed the launch to be of a Sineva missile, but on 23 May 2011 revealed the missile fired was actually the Layner. The successful firing, aimed at the Kura Test Range, was conducted from the submarine K-84 Ekaterinburg.

K-114 Tula, one of the seven Delta IV class submarines of the Russian Navy, launched the second Layner in September 2011.

The second launch of the Layner missile took place on 29 September 2011 from the submarine K-114 Tula in the Barents Sea aimed at the Kura Test Range. Following the second successful Layner test, the Russian Navy decided to accept the missile into active service to augment the RSM-56 Bulava missile and improve the future viability of the Delta IV class submarines until at least 2030. Development work on the missile was completed by late February 2012. Missile was recommended by the State Commission for adoption as of December 2012. Missile weapons complex D-29RMU2.1 with missile R-29RMU2.1 accepted for service by decree of the President of the Russian Federation in January 2014.

The Layner missile is a highly advanced derivative of the three-stage liquid-propelled R-29RMU Sineva SLBM, which was accepted into service in 2007. While many technical details are not disclosed, it is known that the missile is capable of carrying up to twelve low-yield nuclear warheads called MIRVs capable of striking several targets individually. This is twice the number of warheads the solid-propellant RSM-56 Bulava SLBM can carry, and, unlike those of the Sineva SLBM, these warheads can be of a mixed set with various yields. While it shares flight characteristics with the Sineva, the Layner is equipped with improved systems to overcome anti-ballistic missile shields. The missile can carry ten low-yield warheads with penetration aids, eight low-yield warheads with more penetration aids, four medium-yield warheads with penetration aids.

See also

• Comparison of ICBMs
• M51 SLBM - French submarine-launched intercontinental ballistic missile
• Trident SLBM - US submarine-launched intercontinental ballistic missile
• JL-2 SLBM – Chinese submarine-launched intercontinental ballistic missile
• R-29RMU Sineva - Russian submarine-launched intercontinental ballistic missile
• RSM-56 Bulava - Russian submarine-launched intercontinental ballistic missile
• RS-26 Rubezh - Russian Intercontinental Ballistic Missile based on the RS-24 Yars
• RS-28 Sarmat - Russian heavy intercontinental ballistic missile, replacement for R-36M SS-18