While I edit up the final part of the build video, I thought you might like proof that this ZMR250-based low-cost miniquad really does fly. Although it obviously needs some tuning, the quad does fly "right out of the box" at the end of the build process. A few notes on the video...
This was the first FPV flight of the quad and I used linear antennas at both ends (on the quad and the DVR) so you can see what to expect with this setup. The background video was recorded onboard with the RuncamHD action camera and the center video is direct from the FPV camera via the 5.8GHz link. I will be doing another video showing how CP antennas improve this by reducing the drop-outs and glitches you see in the "live video" feed.
Because it's untuned, the quad shows a tendency to "pop its nose up" in forward flight when in rate mode... I'll be posting PIDs that eliminate that -- although I suspect that most doing this build will be flying in self-leveling mode for a while anyhow and the stock PIDs are just fine for that.
This flight was flown in rate/acro mode (except for a bit right at the end -- when you can see the quad jerk as I switch it into self-leveling mode).
As you can see... despite the low build-cost, this little miniquad is plenty-fast :-)