NASA RASSOR Drum Concept

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The concept revolves around two distinct sections, each boasting twin spiral openings that converge into a central chamber at a precise 90-degree angle. This strategic design ensures that digging forces are evenly distributed between the scoops, maximizing efficiency. The entire assembly is crafted from high-strength aluminum, with a hard anodizing process protecting it from the abrasive effects of regolith. Laser or TIG welding techniques are employed to assemble the aluminum parts, yielding maximum mass retention. Aluminum was chosen for its abundance and affordability, as well as its suitability for undergoing high-hardness surface treatments. In contrast, carbon fiber composites, while lightweight, would be vulnerable to damage from regolith exposure, rendering anodized aluminum a far superior choice due to its extended longevity, low outgassing values, excellent thermal properties, and absence of organic compounds. The drum itself leverages every available volume, boasting a diameter of 450mm and length of 360mm, with a mass of 4.8kg – well within the acceptable limit. The cylinder's 54L volume is designed to be filled at approximately 75% capacity, contingent upon the angle of the scoops. While magnesium could potentially be used as a lighter material, the resulting increase in cost would undermine the goal of mass-producing such systems for future lunar base construction.