|N-IIGR - 1962 - N-IIGR Multi-Warhead FOBS, 1962|
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This 1962 project was designed by Korolev's OKB as a competitor to Chelomei's UR-500 against the military GR-2 (Global Rocket 2) requirement. The N-11GR was an adaptation of the basic N-11, derived from the second and third stages of the N1 heavy booster. The GR-2 was to be a kind of enormous multiple-warhead FOBS (fractional orbit bombing system). Surrounding the top of the second stage of the rocket, like bullets in an enormous revolver, were six final stages derived from the 8K713 GR-1 last stage. Each stage had a 1,500 kg nuclear warhead. The stages would separate from the main vehicle, and make violent maneuvers using independent guidance systems to put each warhead in a different low 160 km altitude orbit. At the end of 10,000 to 12,000 km journey along their separate orbital paths, the warheads would appear on US radar screens at the last moment with minimal warning. The total spread of the warheads would be 1800 km from left to right; two such missiles could devestate America's major cities from coast to coast. Chelomei's UR-500 instead was selected for the mission (and in turn never put into operation as a weapon).
Payload: 9,000 kg. to a: 6 x 1500 kg warheads, 160 km orbits, 1800 km apart trajectory. Liftoff Thrust: 1,082,000 kgf. Total Mass: 753,000 kg. Core Diameter: 9.8 m. Total Length: 40.0 m.
The GR-2 was to be a kind of enormous multiple-warhead FOBS (fractional orbit bombing system). Competitors included Korolev's N-11GR; Chelomei's UR-500; and Yangel's R-56