sapolo 4d

R-4D. spesial 4d Credit: Aerojet Redmond. usg 4d janin 20 minggu Marquardt N2O4/MMH rocket engine Developed as attitude control thruster for the Apollo Service and Lunar Modules in 1960s In production for numerous satellites (Leasat, Insat, HS 393, Milstar, Intelsat 6, Italsat, Eurostar) for apogee / perigee maneuvers, orbit adjustment, and attitude control