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N1 Block R
KVRB stage
KVRB stage
Credit: © Mark Wade
LOx/LH2 propellant rocket stage. Designed 1965-1971 as replacement for N-1 Blok D. Cancelled 1971 in favor of Blok Sr; revived and developed in 1974-1976. First static test Oct 12 1976. Two stages tested 1976-1977. Strangely never replaced Blok D on Proton.

Status: Development ended 1971. Thrust: 73.50 kN (16,523 lbf). Gross mass: 23,000 kg (50,000 lb). Unfuelled mass: 4,300 kg (9,400 lb). Specific impulse: 440 s. Burn time: 1,080 s. Height: 8.70 m (28.50 ft). Diameter: 4.10 m (13.40 ft). Span: 4.10 m (13.40 ft).



Subtopics

Proton KM-4 LOx/LH2 propellant rocket stage. Planned version for Proton. Never developed.

Angara KVRB LOx/LH2 propellant rocket stage. Planned version for Angara. 5 restarts.

GSLV-3 stage LOx/LH2 propellant rocket stage. The stage finally reached hardware status as a joint Russian-Indian development for India's GSLV booster.

Country: Russia. Engines: RD-56. Launch Vehicles: N1M, N1F-L3M. Propellants: Lox/LH2.

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