Narrative:

I was on an evening flight with a co-worker and on my way back to ZZZ; where I live and my plane is kept; I called out on CTAF at 4 miles and again at 2 miles; that I was inbound for that airport. No other aircraft responded nor was there any calls of any activity at that airport.all of a sudden in front of me at no more than a quarter mile was the blue and gray ultralight/light sport aircraft that has been flying out of a neighbor's property on ZZZ. He was at about 1250-1300 ft. Flying directly east after take off. Then a transmission came over frequency 'don't worry aircraft X; I will get out of your way'. I turned right to be sure not to hit him as he went off to my left and up. He had no navigation lights on; but being right in front of my vision; I had no trouble seeing him as it was still sunny and clear out.at this point I was on right downwind. My partner on the ground radioed that 'the crazy idiot with the little plane is up so be sure to look out for him'. Too late; we'd already had too close of an encounter. I landed my plane safely and saw that plane land too. I intend to go talk to him about his unsafe practices that I have been witnessing in addition to this event. He is a danger to himself and others. He takes off in winds too strong for his craft and weather that I wouldn't even dare fly in. A neighboring pilot watched him disappear into clouds not far above the airport just a few weeks ago. He is a disaster that will happen. He has purchased a aircraft and is getting it ready to fly. That will be a major disaster for certain. I do not even know if this fellow; even has a license of any sort.I lost my father in a mid-air collision because someone was flying inappropriately at an airport and without their radio on. Dad must have been looking out for me last night.

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Original NASA ASRS Text

Title: Pilot reported a NMAC on final to home airport with someone in an ultralight/sport aircraft that has been a nuisance around the area.

Narrative: I was on an evening flight with a co-worker and on my way back to ZZZ; where I live and my plane is kept; I called out on CTAF at 4 miles and again at 2 miles; that I was inbound for that airport. No other aircraft responded nor was there any calls of any activity at that airport.All of a sudden in front of me at no more than a quarter mile was the blue and gray ultralight/light sport aircraft that has been flying out of a neighbor's property on ZZZ. He was at about 1250-1300 ft. flying directly east after take off. Then a transmission came over frequency 'Don't worry Aircraft X; I will get out of your way'. I turned right to be sure not to hit him as he went off to my left and up. He had no navigation lights on; but being right in front of my vision; I had no trouble seeing him as it was still sunny and clear out.At this point I was on right downwind. My partner on the ground radioed that 'The crazy idiot with the little plane is up so be sure to look out for him'. Too late; we'd already had too close of an encounter. I landed my plane safely and saw that plane land too. I intend to go talk to him about his unsafe practices that I have been witnessing in addition to this event. He is a danger to himself and others. He takes off in winds too strong for his craft and weather that I wouldn't even dare fly in. A neighboring pilot watched him disappear into clouds not far above the airport just a few weeks ago. He is a disaster that will happen. He has purchased a aircraft and is getting it ready to fly. That will be a major disaster for certain. I do not even know if this fellow; even has a license of any sort.I lost my father in a mid-air collision because someone was flying inappropriately at an airport and without their radio on. Dad must have been looking out for me last night.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.