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Engine 11D68 detail
Engine 11D68 detail - Closeup view of the 11D68 Block D lunar crasher stage showing detiail of the BOZ orientation/ullage thrusters that control the stage during coast, restart, and maneuver.

Credit: © Mark Wade. 43,376 bytes. 393 x 424 pixels.

Gross Mass: 17,550 kg. Empty Mass: 2,300 kg. Thrust (vac): 8,670 kgf. Isp: 352 sec. Burn time: 610 sec. Propellants: Lox/Kerosene Diameter: 3.7 m. Span: 3.7 m. Length: 7.1 m. Country: Russia. No Engines: 1. RD-58M Status: Hardware. Other designations: Block DM; D-1-e. Comments: Also known as Block DM; article number 11S86. With guidance unit, designed for insertion of military spacecraft into geosynchonous/ medium earth orbit. Used from 1974 to 1990. Succeeded by 11S861.

Block D / 11D68Block 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. 52,122 bytes. 398 x 580 pixels.

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