The propulsion system will consist of: Four (4) 3000 N Viking-like thrusters with throttle control. Eight (8) 4.5 N thrusters for roll control during landing, and TCMs and ACS during cruise Development Issues: Ultralight composite tanks are proposed to reduce total tank mass since two propellant and two pressurant tanks must be used for configuration reasons. These tanks are currently being developed by MSL and Scout efforts, and should be available at the time of launch. Monoprop and Viking Thrusters are all fed from a single feed system. It is assumed that some development and testing will need to be performed to confirm the 4.5 N thrusters can handle the higher pressure that is required by the Viking thrusters.
RAD 750 Based Processor, 33 Mhz < 5.7Kg and < 45Watts Typ
Aggressive mission as regard cost: science similar to Phoenix mission with $100M dart equipment and no free lander. Hard constraint: no less than 10 geophones and 5 explosives -> no cost flexibility/ incrementation Geophone = Explosive dart assumption: Does not take R&D (actually limited) and testing costs for explosive darts. This is offset by the fact that explosive is less expensive than instrumentation. Geophone study is the primary objective Adapt cost model to MGL: Darts: JPL model is not made for learning curve with 20 duplicates. Testing too conservative : test every batt and parachute Science dvpt: done in university Science team: the model accounts for too many people Ground operations: transferred to private contractors Total cost: Full science total cost is over the 450 cap. However we have a fall back plan. JPL CNES cooperation: Seismometer from Netlander mission (free) pay for some darts? Not politically easy… Free ride: No European mission to Mars is currently planned to follow Mars and Express Beagle 2 results (until 2020). France and Europe may well be interested in taking the MGL opportunity to fly their Netlander instruments and participate in launch costs