UR-100N ICBM - UR-100N ICBM Versions Credit: © Mark Wade. 8,399 bytes. 166 x 318 pixels.

The UR-100N was designed as a replacement for the UR-100 at the end of its 10 year storage life. Although it could be installed in the same silos, it was 50% heavier. The competing design of Yangel, the MR-UR-100, was also put into production when the Soviet hierarchy deadlocked and could not pick one design over the other. The missile, 18.8 m in length and 2.5 m in diameter, was encapsulated in a 24.3 m long, 2.9 m diameter canister. The UR-100N could deliver six 375 kg / 750 kt MIRV's to a range of 9075 km with a CEP of 550 m. Missile system reliability was estimated to be 85%, and with a warhead reliability of 95% and force readiness of 90%, total system reliability was estimated as 75%.

The UR-100N was deployed from 1975. Accuracy problems associated with first stage oscillations only became apparent during tests of in-service missiles in 1979. Interim fixes were made, but the UR-100N was replaced before the end of its 10 year service life by the UR-100NU, beginning in 1979, with all UR-100N's retired by 1983. Surplus UR-100N's are marketed to the West as the 'Rokot' launch vehicle.

Liftoff Thrust: 157,970 kgf. Total Mass: 90,445 kg. Core Diameter: 2.5 m. Total Length: 20.0 m.

• Stage Number: 1. 1 x UR-100N Stage 1N Gross Mass: 77,150 kg. Empty Mass: 5,695 kg. Thrust (vac): 181,373 kgf. Isp: 310 sec. Burn time: 121 sec. Isp(sl): 285 sec. Diameter: 2.5 m. Span: 2.5 m. Length: 17.2 m. Propellants: N2O4/UDMH No Engines: 4. RD-0232

• Stage Number: 2. 1 x UR-100N Stage 2N Gross Mass: 12,195 kg. Empty Mass: 1,485 kg. Thrust (vac): 21,850 kgf. Isp: 322 sec. Burn time: 183 sec. Diameter: 2.5 m. Span: 2.5 m. Length: 3.9 m. Propellants: N2O4/UDMH No Engines: 1. RD-0235

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  Ur100Nu Credit: © Mark Wade. 1,225 bytes. 47 x 393 pixels.

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• Stage Number: 3. 1 x UR-100N MIRV Bus Gross Mass: 1,100 kg. Empty Mass: 725 kg. Thrust (vac): 500 kgf. Isp: 200 sec. Burn time: 150 sec. Diameter: 2.5 m. Span: 2.5 m. Length: 0.5 m. Propellants: N2O4/UDMH No Engines: 1. RD-0237

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  UR-100NU Credit: Khrunichev. 5,078 bytes. 92 x 372 pixels.

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• 193 - Placard, TsNIIMASH Museum, .
• 220 - Khrunichev Brochure, 1996.

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Ur100Nrv Credit: © Mark Wade. 1,256 bytes. 48 x 412 pixels.

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Ur100Nmr Credit: © Mark Wade. 1,053 bytes. 46 x 412 pixels.

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Universal Rockets - Chelomei's Universal Rocket Family. From left to right: UR-200. Original UR-500 configuration, composed of clustered UR-200's. Conventional UR-500 monoblock configuration. Selected UR-500 polyblock configuration. UR-500 two-stage configuration as flown. UR-500K configuration with Block D upper stage. Credit: © Mark Wade. 36,031 bytes. 630 x 351 pixels.

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Ur100Mr Credit: © Mark Wade. 1,070 bytes. 43 x 325 pixels.

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