Birdbrain RC Exocet 5

By CarbonRain on May 07, 2020

16  154  5

So the Fortress builds proved that I can consistently cut a decent box frame thanks to the thickness tolerances being awesomely tight on my carbon sheets these days. Since I (and nearly everyone!) have a lot of free time at the moment, I figured I'd go back to an idea I've had rattling around in my head for a good year or more - a box frame with a plus layout.

It's no secret that I do love a plus quad (got 7 in my current fleet!) - I love the idea of box frames too though, so what better way to overcomplicate things by combining them. At the same time, I've had good experiences with elevated rear motors on quads, as a means of getting the stretch frame benefit without needing a stretch frame size - so naturally I went for the trifecta of weirdness, a box plus with vertically staggered motors.

The carbon parts came together in CAD pretty quickly, having decided right at the start to use a 20x20 stack because I already had an Aikon AK32Pin and a Matek F411 Mini SE sitting on my shelf. The vertical staggering was symmetric about the side arms, which means the 4 cross braces are identical. I also canted the side arms at an angle to leave room for a battery strap, and added a couple of 3D printed bits to cover the sharp carbon edge and prevent straps from getting cut.

Designing the canopy on the other hand was a huge pain. It's been a while since I've done one, so it took a couple of hours to figure out surfacing in Solidworks again, and then once I started the file got messy real quick. It ended up taking best part of 3 days of on/off work and several restarts to end up with what you see here - still not 100% happy with it, but it'll do for testing for now.

When it came to component choice, obviously the stack was decided by virtue of already having it, and for motors I decided to pick up a set of AMAXinno's new range. I've always had a great experience with their motors, and figured for a lighter (by my standards at least) quad I might as well stick with the lightweight theme and use 2305s.

Foxeer Predator Nano came out of a failed toothpick project, and despite not being the smallest or lightest VTX I went with an AKK race since I have a ton of them. I also ended up 3D printing a shelf that the stack bolts screw into to mount the VTX and XM+, to keep things as compact as possible, along with my usual stack spacers and RX antenna mounts which on this build are completely out of harm's way far below the propline. Flywoo LED racewire (in pink!) rounds out the build, and should look pretty wild on the track from behind - hopefully where most pilots will be seeing this quad from!

Photos

Discussion

Sign in to comment

apexfpv   18 days ago  
2

Is there a place where I can purchase the frame? It looks spectacular!

CarbonRain   18 days ago 
1

Thanks very much! Still very much preproduction at the moment, wouldn't be happy selling them until I'm sure it won't break as soon as it hits a gate - unfortunately lockdown here in the UK means no flying, but hopefully it won't be too long before we can get back in the air again and I can put some time in with it :)

apexfpv   18 days ago 

Let me know once you get something figured out!

Sabredave   15 days ago 

I too would be interested. Looks really nice!

Jodie Froster   17 days ago  

Beautiful work

Guides & Reviews

27 1,907  27
21 days ago

This guide will walk you through the process of building your first FPV quad. The goal with this design was to build a low-cost, lightweight quad, yet powerful enough to safely carry a GoPro in close proximity areas. I chose these parts to minimize the amount of soldering at no cost to the quality. A typical build requires around 30 solders while this only needs 25. It's not a huge difference, but..

Read more
25 6,779  24
Nov 30, 2019

In late 2019 DJI made inroads into the FPV scene with their remarkable low-latency digital system. It gave us a 720p video feed with latency on-par with the status quo, analog video. Traditionally we've used analog video systems for low-latency video, but the video quality is far from ideal. It's a trade-off we've been willing to accept for the control. Now we've got the best of both worlds and what..

Read more