Small Aircraft; Low Wing; 1 Eng; Fixed Gear
Flight Crew Last 90 Days 12; Flight Crew Total 150; Flight Crew Type 150
Conflict NMAC
Flight Crew Took Evasive Action
Human Factors
I was conducting touch-and-go's with a flight instructor friend. Both I and Aircraft Y were making radio calls. There were two other aircraft in the pattern as well as skydivers landing at the airport. During my second touch-and-go; Aircraft Y entered the pattern directly below me from a 45-degree entry to the left downwind for Runway 21. My friend noticed traffic advisory alerts on an iPad running Foreflight that alerted us to the proximity. I maneuvered out of the pattern away from the runway to create space. Aircraft Y appeared to have no notice of my presence above him/her. Aircraft Y appeared on my right side (outside the pattern); disappeared under my [airplane]; and reappeared on my left (inside the pattern from me).
Pilot reported an NMAC event during landing practice with a nonreporting aircraft entered the landing pattern.