ADHD Upgrade

thingiverse

I'm working on a OpenSCAD version of the ADHD, with wingspan of 50cm cut from a piece of Depron foam. The engine is a 1306, and I've chosen 4.3g servos and a 2S 300mA battery. Note that this plane hasn't been built yet; things will likely be re-designed. I'll move the battery once I have the first prototype printed. This model would make an excellent addition to any swarm setup. As always, I've included OpenSCAD files for anyone who wants to modify the design themselves. I've made several upgrades since starting this project. The total weight of the plastic parts is approximately 30g. I created a detailed wing version with winglets instead of a rudder. I also added an FPV camera to the design. When assembling the parts, be sure to use super glue. Checking the CG is crucial - I recommend using http://rcwingcog.a0001.net/?i=1 to calculate it. The battery cavity is too long, so you'll need to adjust or fine-tune the CG accordingly. I've added tiny wire fixtures for the ESC and engine wires. Everything looks good at this point. The hardware has arrived, and I'm excited to start building some prototypes. Tip: When working with these small craft, keep in mind that they can generate a lot of electrical/RF noise. To improve performance, consider adding filters and shielded cables. Filter caps and inductors will also help. Prototype build is underway. One issue I've encountered so far is that the plane is a bit heavy in the rear. I used hinge tape to mount the rudders, and a 2mm carbon rod for reinforcement of the wing. The camera is press-fitted with insulation from a silicone cord. Super glue has been my go-to adhesive for most components. I've also built a small PDB from a piece of PCB, featuring SMD caps and inductors. Initial testing suggests that the VTX works fine, the engine rotates as planned, but I still need to configure the flight computer. For this prototype, I used a wingspan of 50cm, but I may extend it to 65cm in future iterations. Moving the winglets forward should help with the plane's weight distribution. As I assembled the prototype, I made several small adjustments that will be incorporated into the next upgrade. I'm also considering adding a pair of ribs to maintain the wing's curve. Test flights are just around the corner!