Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Flight Instructor; Flight Crew Instrument
Flight Crew Last 90 Days 40; Flight Crew Total 2540; Flight Crew Type 600
Situational Awareness
Conflict Airborne Conflict; Inflight Event / Encounter Wake Vortex Encounter
Flight Crew Took Evasive Action
Environment - Non Weather Related; Procedure
I was doing stop and go's in the pattern at ORK for night currency.  We departed ORK and upon climbing on departure our ADSB gave an alert for traffic. We noted a fast moving aircraft from our rear; stopped our climb at 300 feet AGL and watched a B757 pass right over us as we crossed the departure end of RWY 5 at ORK.  ADSB indicated the B757 aircraft was 700 feet above us; placing them in the traffic pattern for ORK. The B757 then turned towards LIT as if on a visual approach.  This felt very unsafe as we felt wake turbulence when we continued our climb out towards the track of the B757.  I was startled a B757 would be so low and at traffic pattern altitude over a non-towered airport.
C172 Instructor Pilot reported encountering wake turbulence while departing ORK from a B757 inbound to LIT.