I always wanted to build a RotorX RX122 Atom V3 4" frame because I kept seeing great reviews on it. So here it is, a light 4-inch quad that weighs in around 142g - 150g depending on what props you use. Overall it was a pretty easy build with a HGLRC XJB F428 stack because all I need to wire up is the Motors, VTX, Camera and RX. Initially I was using the stock dipole antenna with the eachine VTX03 but it was not doing as well as I hoped so I switch it out to a TrueRC AXII.
As for the props, It all depends on what you want to get out of your Atom. I like the flight characteristic of the GemFan Flash 4052 but it does weight a lot compared to everything else I have tried. Even with the extra weight it still flies very efficiently, I get about 6 minutes of flight time (depending on the way you fly). I also like how quiet the flash props are compared to the 2 blade Dals. However, the GemFan Flash props are a tad bit larger which has less than a millimeter of clearance between the props. As of now I was able to fly it without any issues or props strikes but it is just too close for comfort. Over all this is a great frame, I know it is an older design, but it just works. So, I will be keeping this setup in my collection for a while.
Update July 2018: 3D Printed Canopy
I liked how this 3D Printed Canopy fit, but I had 2 issues: it’s kind of fragile and heavy. So I end up going back to the original canopy, but this time I modified the camera opening so I can increase the camera angle.
Update May 2019: Another 3D Printed Canopy
I wanted to try using a GoPro Session 5 on the Atom and see how it performs so I finially installed this 3D Printed Canopy that I printed over a year ago. Surprisingly I did not take pictures of the canopy but if you are interested, you can download the STL files here (I did NOT design this canopy):
https://www.thingiverse.com/thing:2155306
Here is a video of the Atom with a GoPro Session 5 strapped to its back.
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The build looks great btw. Do you know if the quad is under 250g with the battery added? If so it would be an awesome build for when the new laws are introduced here in the UK next year.
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fantastic build and photos!!! Did you find or can you recommend an alternative/solution to the camera angle drawback you mentioned in one of your comments?
Thanks! I end up using a dremal and trimming the opening of the canopy and I was able to push the TPU camera mount and force it to stay in place. Before going this route I 3D printed a white canopy (PETG) that allowed me to have any camera angle but it could not take the abuse. I broke 2 of them after a few crashes so I end up going back to the oginal canopy (Blue).
Thanks for the response.