Small Aircraft
Flight Crew Private
Flight Crew Last 90 Days 53.8; Flight Crew Total 199.2; Flight Crew Type 8.5
Conflict NMAC
Flight Crew Took Evasive Action
Aircraft; Human Factors
On left 45 degrees entry for the left downwind runway 5 at Deland Municipal-Sidney H Taylor Field when an unknown aircraft maneuvering within the proximity of the airport came within 500 feet off my left wing. I attempted to execute evasive maneuvering without losing sight of the aircraft by turning right; but the unknown aircraft continued to turn towards me and decreased separation. Separation decreased to about 400-500 feet until the other aircraft executed a turn northbound and climbed away from me.
GA pilot reported while downwind; they almost had a NMAC while trying to avoid an unknown aircraft.