The optimized design consists of aluminum propellant tanks, a cylindrical outer structural shell, tank mounted multi-layer insulation, a propellant management system with capacitance probe propellant mass sensors, and screen start baskets to provide propellants at the tank outlets during zero g coast. A pressurization system is used which keeps the propellant tank constituents in thermal equilibrium at all times, thereby maintaining a constant state of readiness. The propellant inlet ducts are designed to maintain liquid propellants in near proximity to the engine inlet, providing an instant start capability.


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