Block D / 11D68 Credit - © Mark Wade

Other Designations: Block DM; D-1-e. Class: Tug. Nation: Russia.

Upper stage / space tug - in production. Launched by Proton. Also known as Block DM-5. With guidance unit, modification of 11S861 stage for heavier payloads and with different payload adapter. Commercial version was Block DM2, with Iridium dispenser.

Designed for insertion of multiple spacecraft into medium earth orbit.

Unit Cost $: 4.000 million. Length: 7.10 m (23.20 ft). Basic Diameter: 3.70 m (12.10 ft). Span: 3.70 m (12.10 ft). Mass: 14,600 kg (32,100 lb). Main Engine: RD-58M. Main Engine: 230 kg (500 lb). Main Engine Thrust: 85.020 kN (19,113 lbf). Main Engine Propellants: Lox/Kerosene. Main Engine Propellants: 11,300 kg (24,900 lb). Main Engine Isp: 352 sec.