| RK-55 Relief|
(NATO reporting name: SSC-X-4 'Slingshot')
S-10 Granat(SS-N-21 'Sampson')
|Type||surface/sub-launched nuclear cruise missile|
|Place of origin||Soviet Union|
|In service||since 1984|
|Used by||Soviet Union / Russia|
|Designer||L. V. Lyulev, Novator NPP Temp, Raduga|
|Manufacturer||Novator, NPP Temp, Raduga MKB, KhAZ (Kharkiv), others?|
|Mass||1,700 kg (3,750 lb)|
|Length||809 cm (26 ft 7 in)|
|Diameter||51 cm (20.1 in)|
|Blast yield||Nuclear 200kt|
|Engine||Solid-propellant rocket booster + R-95-300 or 36MT-37 turbofan|
|Wingspan||310 cm (122.0 in)|
|3,000 km (1,600 nmi)|
|Maximum speed||720 km/h (447.4 mph)|
|Sprut inertial guidance plus TERCOM|
|Akula-class submarine, Sierra II, Victor III, Yankee Notch, Yasen-class submarine, TEL|
The Novator RK-55 Relief (Russian : РК-55 Рельеф 'Relief'; NATO: SSC-X-4 'Slingshot'; GRAU: 3K12) is a Russian land-based and submarine-launched cruise missile with a nuclear warhead developed in the Soviet Union. It was about to enter service in 1987, when such weapons were banned under the Intermediate-Range Nuclear Forces Treaty. A version launched from submarine torpedo tubes, the S-10 Granat (SS-N-21 'Sampson'; GRAU: 3K10), has apparently been converted to carry conventional warheads and continues in service to this day. The Russian Federation was reported to have deployed the derivative SS-CX-7/SS-CX-8 systems on February 14, 2017.
The RK-55 is very similar to the air-launched Kh-55 (AS-15 'Kent') but the Kh-55 has a drop-down turbofan engine and was designed by MKB Raduga.Both have formed the basis of post-Cold-War missiles, in particular the 3M-54 Kalibr which has a supersonic approach phase.
In the late 1960s, the "Ekho" study conducted by the GosNIIAS institute concluded that it would be more effective to deploy many small, subsonic cruise missiles than the much more expensive supersonic missiles then in favour. [ citation needed ]In 1971 Raduga began working on the air-launched Kh-55, which first flew in 1976. That same year, RK-55 first flew. NPO Novator would work on the submarine- and ground-launched versions. In 1993 Novator exhibited the Sizzler series weapons, which appears to be based on the RK-55. It is a two-stage design, which goes supersonic during its final approach to the target.
Six RK-55 missiles are carried on an eight-wheeled transporter-erector-launcher (TEL) based on the MAZ 543 launcher of the R-17 (SS-1 'Scud B').
The S-10 is launched through 533 mm torpedo tubes.[ citation needed ]
Fewer than 100 RK-55s had been deployed by the end of 1988.The new Akulaclass was the first class to receive the new missile. It was later fitted on the Sierra I/II and Victor III classes and the new Yasen-class submarines.
Four Yankee-class submarines deployed in 1988is a design of particular note, replacing the missile compartment with additional torpedo tubes for 35-40 land attack cruise missiles. They were probably nuclear-tipped S-10s during the Cold War, and then converted to use conventional warheads after the START I treaty restricted sub-launched nuclear cruise missiles. The US Navy has done the same on a grander scale with the SSGN conversions of four Ohio-classsubmarines. It has been suggested that S-10's could in future be fitted to converted Delta-class submarines, or to surface ships, but these have not been confirmed.
The ground-launched variant was subject to the Intermediate-Range Nuclear Forces Treaty signed in December 1987 and had been tested.Six launchers with 84 missiles was deployed at the Missile/Launcher Storage in Jelgava (Latvian Soviet Socialist Republic) and had been destroyed by November 1990.
In early 2017, US officials and analyst Jeffrey Lewis asserted that Russia was violating the INF through the deployment of the 9M728 (SSC-X-7) and 9M729(SSC-X-8) missiles as part of the Iskander missile system. These are widely reported as variants of the earlier SS-C-4. According to U.S officials, two missile battalions equipped in SSC-8 were deployed as of 14 February 2017 in violation of the treaty. Each battalion consists of 4 launchers, each launcher supplied with six nuclear-tipped cruise missiles. One battalion is allegedly located at Kapustin Yar near Volgograd; the other's location is unknown at this time. The German newspaper FAZ argued in February 2019 that in addition to two known locations where missiles and battalions are stationed – at a launch pad at Kapustin Yar, in southern Russia, and Yekaterinburg – there would be two other places equipped with these missiles: Mozdok in North Ossetia and Shuya near Moscow. Each of the four battalions would have four-wheeled launchers, each carrying four missiles, adds the German media. This adds to 64 SSC-8 missiles in Russia's possession, which can be armed with conventional or nuclear warheads. This type of missile has a range of 2,350 kilometers. With a conventional warhead of 500 kilograms, the range is 2,000 kilometers.
Conventional unitary High Explosive (HE) warhead and submunition warhead versions of the RK-55 have probably been developed, to justify the continuing service of the submarines that carry them.
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