Save A Falling Egg

grabcad

In my second entry for this challenge, I've used five parts, with four components containing five helical spring elements to adjust and fix the egg in axial and radial directions for varying egg sizes. The design is similar to a diving bell without watertight sealing. A preliminary calculation was done for dimensioning the spring elements based on the height of fall (4.5m), mass of the egg (0.075kg), potential energy of the egg (3.3J), and spring rate. However, using plastic material to achieve such a high spring rate seems improbable. I believe this new concept is more suitable than my first entry for converting the kinetic energy of the falling egg into the work of a spring. A FEM-analysis has not been done on the spring elements yet. If you fill the complete cavity of the ball with sawdust or a similar material after assembling the egg, it might increase its chances of surviving the free fall. The model is available in STEP (.stp), STL (.stl) for 3D printing, and native PTC Creo Parametric 2.0 (.prt,.asm) formats. Thank you for your attention!