Nice! That’s a solid upgrade path—swapping the old CC3D mini for a Foxeer F405v2 is going to give your Quanum Trifecta a whole new life, especially with ArduCopter onboard. It’s a pretty big jump, though, especially if you’ve never used ArduCopter before, so here’s what to expect (real talk, no bullet points, just straight-up chat).
First off, ArduCopter is incredibly capable, but it’s also more complex compared to something like Betaflight or Cleanflight. It’s more tuned for versatility and mission planning, and less about raw freestyle or racing performance, which actually makes it perfect for something like the Trifecta especially if you're aiming for longer flights, GPS navigation, or autonomous capability.
Flashing ArduCopter onto the Foxeer F405v2 is pretty straightforward through Mission Planner or QGroundControl, but you’ll want to make sure you're loading the correct firmware target for that board. Since the F405 is a bit lean on flash memory, you'll likely have to run a version with some features trimmed down usually the "F4 V3x" target (check on the official ArduPilot site just to be sure your board is fully supported).
The main thing you'll notice is the setup process is more detailed. You’ll have to calibrate the accelerometer, compass (if you're using one), radio, ESCs, etc. But Mission Planner walks you through it nicely, and once it’s set, it just works. You’ll also get features like auto-tune, in-flight mission scripting, and if you add a GPS, return-to-launch and autonomous waypoint nav are all on the table.
Since the Trifecta’s tail motor tilt is a bit unusual, you may need to mess around with mixing or adjust parameters so it behaves well—there are a few folks online who’ve made ArduCopter work on the Trifecta, so definitely worth diving into some forums or old build logs. Also, take a peek at servo and motor output orders ArduCopter can be picky about that.
But yeah, if you’ve flown Betaflight stuff before, just know ArduPilot is more like configuring a spaceship than a go-kart. But once it’s dialed in, it’s smooth, stable, and super powerful.