o Elevated temperature materials are assumed where normal working temperatures for aluminum or composites are exceeded. o High temperatures and associated environments are limited to known capabilities of known engineering materials. Avionics: o LSI circuit chip technology is assumed available for data processing hardware; data bus techniques are assumed to minimize wire mass. o Communications and GN&C systems assumed Shuttle and full-capability tug technology levels. Laser radar is assumed available for rendezvous as required. Electric Power: o Fuel cells and batteries are assumed for electric power. Main Propulsion: o The P&WA design RL-1O Category IV engine is assumed as the baseline engine. Stage thrust-to-weight calculations will determine appropriate numbers of engines per stage. o RL-10 Category IV characteristics assumed are as follows: Auxiliary Propulsion: o The use of a hydrazine monopropellant system is baselined. Storable bipropellant and advanced O2/H2 auxiliary propellant technologies are assumed available as needed. Thermal and Meteoroid Protection: 0 Multilayer metallized plastic film insulation (MLI) is assumed for thermal protection of all main propellant tanks. A metal skin, non- structural for vehicles with integral tanks, is assumed external to the
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