I've decided to build this quad as a small filming rig for flying in close proximity of consenting people and/or things.

Since I had a feeling that it won't be the lightest one, I have decided to skip the GoPro mount, and use RunCam Split, as 1080p is OK for what I need. With that, the quad is quite tall (40mm standoffs + 1mm washers) and heavy (±270g without the battery).

I have read numerous reports from people who were not able to fly this type of frame because of vibrations (likely combined with a lot of mass outside of propellers). Hard to say whether it is a real problem or they were doing something wrong, but I took no risk - there are two layers of soft mounts below the FC (ie. the ESCs are also softmounted), and the motors are softmounted as well. On top of that, there's a huge capacitor (1000 uF) on the main battery, and LC filter on the 12V output of ESC BEC. This way, I get virtually no noise in the FPV feed (or the recording).

As you can see, this is an incredibly tight build. I would really appreciate if the frame would be couple millimeters wider, because the props are almost hitting the stack (there's like a millimeter or two between them). One has also make sure that wires are not going to be hit, which makes it even more frustrating to put together. Unfortunately even when I was really careful assembling it, I haven't make sure that one wire (Split video out -> FC video IN) was properly secured, I hit it on the maiden flight, and lifted pad on the split, so I could throw its board away. So be really careful!

I was also afraid that I will be hitting the capacitor and/or the LC filter, but surprisingly, there seems to be enough clearance between them and the props.

In terms of wiring, I'm using this setup:

• Physical UARTs:
  -- S.BUS from XSR receiver
  -- RunCam
• Softserials
  -- S.Port telemetry (because inversion can be easily turned on)
  -- TBS Smartaudio

There's no real value in having RunCam connected to UART, because the operations it supports are gimmicks. You basically want to start recording the moment you power on the quad, and stop when you shut it down. This essentially gives you 2 free UARTs should you need them (one one them shared with I2C).

TBS Unify and RunCam are powered through 12V BEC on the ESC (via the LC filter), FC and receiver are powered through 5V BEC on ESC.

The only (but sort of important) drawback of this setup is the amount of amps that it can draw from the battery (at least with the Dalprops). In fact I have killed a brand new 3S battery (Acehe 850mAh 75C) during maiden (yeah, it was an expensive flight). After that, I have changed props to DYS 3045, which are a bit more battery friendly, and switch to 4S battery (Tattu 850mAh 75C). With the 4S battery, the quad is flying nicely, but the peak draw is 59A, which translates to 70C! The poor battery is not exactly happy with this either. I've got a recommendation to try Gemfan 3052 Flash (it is supposed to be more battery friendly while keeping the performance characteristics), so I will get that and see. Flight time is around 3 minutes when you are hard on the throttle, possibly more when flying calmly.

To summarize it - I like the quad. It certainly has its quirks, but it is like a tank (and flies as one as well :-)). I've hit a tree couple of times, and not a single scratch on anything. In case that you hit smaller branches, you often just keep flying as nothing would happened. It takes decent footage (although I regret that the Split can't produce some unsaturated D-log video). If Runcam pushes out Split3 with 4K, slowmo and D-Log recording, then it will be perfect (sort of) :-). However, unless you want to take footage in proximity of things and people, this is not a frame for you, IMO.