Proton 11S861-01

LOx/Kerosene propellant rocket stage. Also known as Block DM-2M, article number 11S861-01. Commercial versions are Block DM3, with Saab payload dispenser, for insertion of Hughes HS 601 bus spacecraft into geosynchronous orbit; and Block DM4, for insertion of FS-1300 bus spacecraft into geosynchronous orbit. With guidance unit, originally designed for insertion of military spacecraft into geosynchronous orbit. Capable of boosting heavier payloads than 11S861 through use of higher-performance 'Sintin' synthetic kerosene fuel.

Cost $ : 4.000 million.