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Block D / 11D68
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. 52,122 bytes. 398 x 580 pixels.

Manufacturer Name: RD-58M. Government Designation: 11D58M. Designer: Korolev. Developed in: 1970-74. Application: Proton 8K824K / 11S824M; 11S824F; 11S86; 11S861; 17S40 stage 4 (block DM). Used on stages: Proton 11S824F, Proton 11S824M, Proton 11S86, Proton 11S861, Proton 17S40. Used on launch vehicles: Proton 8K82K / 11S824F, Proton 8K82K / 11S824M, Proton 8K82K / 11S86, Proton 8K82K / 11S861, Proton 8K82K / 17S40, Proton 8K82K / DM1, Proton 8K82K / DM2. Propellants: Lox/Kerosene Thrust(vac): 8,500 kgf. Thrust(vac): 83.40 kN. Isp: 353 sec. Burn time: 680 sec. Mass Engine: 230 kg. Diameter: 1.2 m. Length: 2.3 m. Chambers: 1. Chamber Pressure: 77.50 bar. Area Ratio: 189.00. Oxidizer to Fuel Ratio: 2.48. Country: Russia. Status: In Production. First Flight: 1974. Last Flight: 1999. Flown: 177. References: 42 , 315 .

Engine 11D68 detailEngine 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.

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Last update 12 March 2001.
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