Launch Vehicle Systems Integration Total Engine System Pump problem? Combustion problem? Components work by themselves, but what happens when they are put together? Get to optimum for components, then what? Sometimes detune individual components to optimize system (get more on this) Integration 1. develop, qualify component 2. integrate, qualify engine system Optimum system is not a combination of optimum components. Example - 1960s Surveyor mission. The turbine takes warm H2 to drive oxidizer and fuel pumps. Mounted to pumps and engine. At maximum performance, there was adverse wear on bearing(~ in which pump). The bearing was loaded badly. Solution - plug passages in turbine creating a side load on the bearing. To fix bearing - detune turbine. Art of Balancing subsystems 1. Identify problem 2. Go to specialist in design for that area 3. Develop various options 4. Chose option that has least impact on other components. Integration - getting new valve to behave like the old valve 1. How are new components mounted (discussed later) 2. Must survive - engine vibration - vehicle vibration 3. Valves may be heavier (cantulevered) - incur weight. If valve is hung on a line, will line tolerate heavier valve? Igniter was no problem, but valve was.