Single Copter - (almost) Maiden Flight

@jaco wrote:

We are new to single rotor airframes. Recently we flew our first custom designed single copter. The airframe was 3d printed.

Link to picture: https://ln.sync.com/dl/b2cd926a0/v55qmc7u-62frfkc3-4jsbubuv-9b9dupxt

Short spec:
5 inch propeller,
EMax 2206 2750KV,
4S battery,
3DR PixHawk Mini autopilot,
3,5 (stable) software.
The airframe selected in QGC as single copter.

Link to flight footage: https://www.youtube.com/watch?v=OZYBMDWbpBE&feature=youtu.be
Link to .bin file: https://ln.sync.com/dl/b01c85e00/nqurgjb7-zh94zeh8-qei23m4u-iqtn9kfw

As you can see from the video the copter heavily drifted and crashed eventually. It flew in AltHold mode. There was some light wind. It flew once before in the Stabilize mode. At that time it hoovered much longer but also went nose down at about 30 deg angle when we tried to make it fly sideways to stop drifting.
The PIDs were increased by 20% from original settings based on initial short trials inside a house.

We are looking for some guidance and help from more experienced members with interpretation of data-flash logs, and for proper PID and other settings.

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