The RPK-2 Viyuga (Russian: РПК-2 Вьюга, meaning blizzard), also designated 81R, and identified by NATO as Starfish and the United States Department of Defense as SS-N-15, is a Russian submarine-launched, nuclear-armed anti-submarine missile system, launched exclusively through 533mm torpedo tubes.
Analogous to the now retired Subroc missile carried by US Navy submarines, it is designed to be fired from a 533 mm (21 in) torpedo tube. It is boosted by a choice of mechanisms depending on model before clearing the water, firing a solid fuel rocket and delivering its payload up to 45 km (28 mi) away. The payload ranges from a simple depth charge to a 200 kt nuclear warhead.
Both submarine- and surface-launched versions exist. The surface-launched versions are used by the Slava, Kirov, Neustrashimyy and Udaloy classes. The submarine-launched versions are used by the Akula, Oscar, Typhoon, Delta, Kilo, and Borei classes.
- Range - 35–45 km
- Propulsion - solid-fuel booster
- Speed - subsonic (Mach 0.9)
- Payload - 5 kt nuclear warhead or a Type 40 torpedo
- Diameter - 533 mm torpedo tubes
- In service - 1969
- Launch mass - 2445 kg
- Inertial guidance
- Metel Anti-Ship Complex, predecessor
- 82R Vikhr (SUW-N-1)
- Type 86R and Type 88R Vodopad/Vodoley/Veter (SS-N-16 Stallion), successor
- Encyclopedia Astronautica
- Shchuka B-class (NATO name 'Akula') Statistics (James Martin Center for Nonproliferation Studies)
- SS-N-15 Starfish (RPK-2 Viyoga)
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