With 250 quad racing becoming more and more popular and local racing events starting to pop-up, Nova Labs member Fred Briggs decided to give it a try. Being a Maker, he didn’t want to buy the same ole’ frame that everyone else had so building from scratch seemed like the obvious way to go. Wanting something a little unique, Fred’s main goals were to develop something that looks cool, flies well, and is inexpensive to build. To meet those goals he quickly decided that Mongo, Nova Labs’ 100 watt laser cutter was a good option for cutting the frame. Having also recently finished building a 3D printer in Nova Labs Build Group 8, having some 3D printed parts seemed logical and a good use for the new tool. Fred also reported always loving the look of the V-tail quads so he settled on that design.
With that design criteria in mind the next step was CAD. Fred decided to use this project to learn OnShape which is becoming quite popular at Nova Labs. There were some frustrating moments with the CAD but the support of the OnShape User Group at Nova Labs helped through this portion. Once it looked cool in CAD it was time to make something!
Fred was able to get DXF files from OnShape and start to laser cut some wood frames which are simply hot glued together. This went through several iterations and this pic is of an early design. You can see the tabs that allow all the parts to key into place for quick and accurate assembly.
Then the “V” for the rear motors got 3D printed. While initially concerned that it might not be strong enough, some stress testing (i.e. crashing) has proven that the design is plenty strong and Fred hasn’t broken one yet.
The frame was painted with a rattle can and then put together. To really make it look cool it needed a thermoformed shell and this was probably the trickiest part of the entire build. It required a CNC routed mold which was made from old 2X4’s that were glued together. After a little sanding and then some paint it came out really well.
After trimming it fit great! The electronics are a very tight fit but it does fit.
Here is the finished product with a painted shell. Fred is really happy with the results and it meets all of his design criteria. It flies fantastic, it builds very easily and it gets attention every time it comes out at the field.
After looking at it Fred has decided to call it the Lil Dragon, and he hopes to run classes using the design at Nova Labs.
The final specs on it are 1806, 2300kv motors with 5” carbon props, 2200mah 3S battery and Naze32 flight controller. It gets about 12 minutes of hover and it is shockingly stable.
For more information please contact Fred directly at email@example.com, or be sure to check out the Open Aeris booth at the NoVa Mini Maker Faire, Sunday, March 13, 2016
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