---> NASA CHALLENGE 2020 <--- NASA RASSOR DRUM - 3 entries

grabcad

This is my submission for the NASA Challenge. The 3-scoops design features a spiral structure within the drum's internal space, with an intended fill ratio exceeding 70% (over 35 liters). This spiral configuration serves two key purposes: directing collected regolith deep into the drum to minimize resistance at the entry point and ensuring even unloading of regolith during reverse rotation at the unloading site, thereby reducing the likelihood of jamming and sticking. During transportation, the drum comes to a stop, minimizing losses due to possible regolith spillage from the small entry area of the spiral. The drum's primary material is carbon fiber, chosen for its weight-reducing properties (calculation link: https://docs.google.com/spreadsheets/d/1ee9JULr8QjGDX7upZeuKtGVvxd2IF4I9Nd5RXKK6HgI/edit?usp=sharing), with antifriction alloys used for the scoops. The 3D model was created using Blender v. 2.79b + 2.81, while regolith grain excavation simulations were conducted in Houdini v.18. Notably, the maximum total width of engaged scoops at any given time remains below 175 mm.