WT-Quadcop

Quadcopter - Optimised for 3D printing Mass: 9.5 g Print Time: 1h:30m (40mm/s, 0.2mm Layer Thickness) Fill: None required - 20%+ recommended Support: None Print orientation: Upside Down CAD: Onshape (free) Simulation / Rendering: Solidworks Topology Optimisation: The old way - Southern Hemisphere The quad was designed around a lofted hollow shell - light weight and quick to print. The two feet should have sufficient surface area to attach the load without having to add Velcro to the battery. SIMULATIONS: Detaching the load from the Quad is likely the most stressful scenario, particularly if the recipient were to use one of the arms as a lever for prying free their delivery from the Velcro feet. SIM-1 attempts to simulate this peeling action: Assuming the Velcro holds the payload to the quad through acrobatics of 2g - a very conservative estimate of the grip strength would be 4 x Load or 1kg = 9.81N. This load is applied vertically to the arm in the simulation as if someone were prying the payload free. The sim uses the standard Solidworks library ABS material. It shows an FOS of 1.85. - The FOS in this scenario is likely to be closer to 1 given the imperfections introduced in the manufacturing process. SIM-2 attempts to investigate what happens when the the velcro closest to the prying arm gives way. it uses the same force as in SIM-1 but with only one of the feet fixed to the load. The resultant torsion causes premature failure in the shell supporting the battery cavity. (FOS: 0.5 - likely less as previously discussed) To eliminate this issue it is recommended that the load be peeled off by gripping the feet directly or by holding the quad by the front or rear and peeling the feet from the load in unison. Alternatively, we'll beef it up at a later date.