Export restricted (ITAR), sale only to US Citizens and Organizations. Scarce Marquardt R-6C Attitude Control Engine Breadboard Test Assembly, measuring approximately 12″ x 2.75″ x 2.75″ (without wires), with a hand-engraved identification tag attached by a wire: "Thruster Assy-5 LB, P/N X244218-002, 'A', S/N 002, 5-2000." The assembly comprises propellant valves attached to the thrust chamber and nozzle, which is protected by a red plastic covering; the breadboard wiring harnesses remain intact. Also includes a second thruster with a longer combustion chamber, measuring 6″ long and 2.25″ in diameter across the baseplate, etched with part numbers: "X244218-002, SN001." All are housed in a plastic case. In overall very good to fine condition. Designed for Earth-orbiting satellite applications, the R-6C qualified in 1981 for the Insat 1, ArabSat 1, and Olympus and HS-393-type satellites.
