R-29RM Shtil

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R-29RM Shtil/RSM-54
Type	SLBM
Service history
In service	1986–2010
Used by	Soviet Navy Russian Navy
Production history
Designer	Makeyev Rocket Design Bureau
Manufacturer	Krasnoyarsk Machine-Building Plant
Specifications
Mass	40.3 tonnes[1]
Length	14.8 metres[1]
Diameter	1.9 m[1]
Warhead	The payload (2800 kg) was capable of carrying ten 100 kT yield MIRV warheads, though only a four MIRV warhead version entered production.
Blast yield	200 kt each[2]
Engine	Three-stage liquid fueled stages using N2O4/UDMH propellant[3]
Operational range	8,300 kilometres (5,200 mi)[1]
Guidance system	Astroinertial[1]
Accuracy	CEP 500 metres[1]

The R-29RM Shtil^[4] (Russian: Штиль, lit. "Calmness", NATO reporting name SS-N-23 Skiff) was a liquid propellant, submarine-launched ballistic missile in use by the Russian Navy. It had the alternate Russian designations RSM-54 and GRAU index 3M27.^[5] It was designed to be launched from the Delta IV submarine, each of which is capable of carrying 16 missiles. The R-29RM could carry four 100 kiloton warheads and had a range of about 8,500 kilometres (5,300 mi).^[6] They were replaced with the newer R-29RMU2 Sineva and later with the enhanced variant R-29RMU2.1 Layner.