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My robot has two hinging augur arms that collects the regolith. They can fold up for easy storage while traveling. The augar's arms will be set completly oppisite of each other to keep the robot at a net-zero reaction force. Once the regolith is loaded into the robot via the augar, the dirt can be unloaded by having a kind of cap slide sideways. The cap is set in the bottom of the bucket/storage bin so that the regolith will simply dump staight out of the robot once the robot reaches the dump zone. The only problem that I see is that as the robot moves, there will be a lot of dirt kicked up, which with static electricity, will want to stick to the robot. The best solution to this problem is the static coating which can be used to negate the static charges.