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Proton 11S824

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Block D / 11D68
Aft view of the Block D lunar crasher stage and its 11D68 engine. The Block D would have taken the LK lunar lander to near the surface of the moon. This stage remains in use today atop the Proton rocket.
Credit: © Mark Wade

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AKA: 11S824;Block D;D-1-e. Status: Retired 1975. Thrust: 83.30 kN (18,727 lbf). Gross mass: 13,360 kg (29,450 lb). Unfuelled mass: 1,800 kg (3,900 lb). Specific impulse: 346 s. Burn time: 470 s. Height: 5.50 m (18.00 ft). Diameter: 3.70 m (12.10 ft). Span: 3.70 m (12.10 ft).

Block D, article number 11S824. Without guidance unit (navigation commands come from payload). Adapted for use with Proton UR-500K as a fourth stage for manned circumlunar flight. Further used to launch large Lavochkin bureau unmanned lunar/planetary spacecraft. Flown from 1967 to 1975.

Cost $ : 4.000 million.