Motor Guard for Upgraded KingKing 90GT Micro Quadcopter

prusaprinters

<p>A few months ago, I <a href="http://blog.patshead.com/2017/06/kingkong-90gt-upgrades.html">modified my KingKong 90GT to make room for larger propellers</a>. You can move the motors outward by quite a few millimeters if you avoid the two innermost screw holes on the frame, and you're willing to use only two screws on each motor.</p> <p>This works surprisingly well. You can upgrade from the stock 2" props to 2.5" props. Flight times and thrust both go up. It is a free upgrade, and I'm very pleased with the results.</p> <p>I've essentially turned my KingKong 90GT into a 105GT.</p> <p>Most of the time, I was flying over grass or dirt, and the hardest thing I'd crash into would be a tree. In those cases, all I ever managed to do was break a prop.</p> <p>The last few weeks, we've been flying in a new parking lot, and I've been crashing into the concrete. Most of the time this happens when I run out of battery, but every now and then it happens because I forget that the KingKong 90GT doesn't have nearly as much thrust as my real racing drone.</p> <p>This modification leaves the motors quite exposed without any carbon fiber to protect them. I recently managed to have enough of a voltage drop that I fell from the sky near the top of a power loop. I was up high enough that it took about four seconds to hit the ground, and I severely bent a motor.</p> <p>Motors are cheap, but I figured I could add a little protection to my modified KingKong 90GT. These little discs extend past the base of the motor, and the little nubbins on top are just about as thick as the carbon fiber frame. This allows you to use four screws--I sized this for 7mm screws, since those come with every set of 2.4" and 2.5" props.</p> <p>In a crash, this bumper will hit the ground first. Using four screws should help hold the bottom of the motor in place, and the bumper should transfer most of the shock to the frame.</p> <p>I've crashed a few times, and they seem to be working well. The part I uploaded is 2mm wider than the bumpers I'm running on my own drone.</p> <p>I printed mine in ABS. We'll see just what sort of crashes they can stand up to.</p> <ul> <li><a href="http://blog.patshead.com/2017/04/the-kingkong-90gt-micro-drone-is-bananas.html">The KingKong 90GT Micro Drone Is Bananas</a></li> <li><a href="http://blog.patshead.com/2017/06/kingkong-90gt-upgrades.html">KingKong 90GT Upgrades</a></li> </ul> Category: R/C Vehicles