This is an excerpt from a report made to the Aviation Safety Reporting System. The narrative is written by the pilot, rather than FAA or NTSB officials. To maintain anonymity, many details, such as aircraft model or airport, are often scrubbed from the reports.
On departure out of the airport, myself and Aircraft Y had a near miss.
The other was operating in the pattern, circling above the airport, seemingly pointlessly, and as I was making my taxi calls, I heard nothing from him. So I tried to time my departure to coincide with his downwind on the opposite side of the airport that I was departing from.
As I was climbing, my Sentry threw a traffic alert, and as I looked over my shoulder to see if I could find him, I made visual contact with the aircraft, and he appeared to be descending into me.
I promptly made a descending left 360 to try and get out of his way, and once he and I were no factor, I continued my climb.
As I was making my CTAF calls, I heard nothing form the other aircraft to indicate that he was in the pattern. The only form of warning I had was my ADS-B In on board my aircraft.
Primary Problem: Procedure
ACN: 2049639
At an uncontrolled airport you do two things: (1) you keep your head on a swivel coming or departing, and (2) repeat #1.