Narrative:

On the listed date and approximate time; I was conducting pattern work and landings. My wife was with me as the passenger and as I turned from left crosswind to left downwind for the runway my wife pointed out that aircraft Y had crossed under my plane from my right and entered left downwind parallel to me and between my plane and the runway. It was at that time that the pilot made his very first radio transmission that he had entered the downwind; would take number one and 'had me in sight'. I asked him what he was doing and if he needed to get in front of me and he said that he would get in front of me to do a short approach for a touch and go and get out of my way. Prior to this radio transmission there was no radio contact with traffic in this pattern and certainly no attempt to communicate with planes or get into the normal pattern. The pilot simply flew under me; passed me between my plane and the runway; and took the number one spot. Had my wife not seen the plane and pointed it out; I would not have seen it before it gained altitude to get ahead of me.there was absolutely no reason for his action other than he had the ability to do so and obviously had no intent to use acceptable communication with other aircraft and or follow normal pattern flight for landing. No [priority handling was requested] and no warning was given as to why he was flying under me in a very maneuverable airplane; to overtake and pass my plane.this is not the first time I have observed this particular pilot display this type of flying behavior and I believe he poses a great risk to the many pilots; both experienced and student/inexperienced; that utilize this airport.

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Original NASA ASRS Text

Title: Pilot reported an NMAC in the traffic pattern at a non-towered airport.

Narrative: On the listed date and approximate time; I was conducting pattern work and landings. My wife was with me as the passenger and as I turned from Left Crosswind to Left Downwind for the runway my wife pointed out that Aircraft Y had crossed under my plane from my right and entered left downwind parallel to me and between my plane and the runway. It was at that time that the pilot made his very first radio transmission that he had entered the downwind; would take number one and 'had me in sight'. I asked him what he was doing and if he needed to get in front of me and he said that he would get in front of me to do a short approach for a touch and go and get out of my way. Prior to this radio transmission there was no radio contact with traffic in this pattern and certainly no attempt to communicate with planes or get into the normal pattern. The pilot simply flew under me; passed me between my plane and the runway; and took the number one spot. Had my wife not seen the plane and pointed it out; I would not have seen it before it gained altitude to get ahead of me.There was absolutely no reason for his action other than he had the ability to do so and obviously had no intent to use acceptable communication with other aircraft and or follow normal pattern flight for landing. No [priority handling was requested] and no warning was given as to why he was flying under me in a very maneuverable airplane; to overtake and pass my plane.This is not the first time I have observed this particular pilot display this type of flying behavior and I believe he poses a great risk to the many pilots; both experienced and student/inexperienced; that utilize this airport.

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.