Narrative:

Aircraft X was on an IFR flight plan performing practice instrument approaches at multiple airports in the kape/palm sector. Pilot was given standard missed (per LOA) from mlb airport of runway heading and maintain 2;000 feet upon completion of the ILS 9R approach. On the missed; the airplane was either not able to check in or was not recognized until 3-4 miles east of the field and leveling at 020. Mlb had requested other releases prior to aircraft X going missed; first one being aircraft Y. Upon seeing a tag show up east of mlb I reached out to aircraft X and instructed him to 'turn right heading 180 immediately-for traffic; and identify.' the pilot acknowledged and started the turn; however with the performance difference between aircraft Y and aircraft X I believe that separation was lost prior to aircraft X establishing a divergent heading. Upon checking of frequency; aircraft Y was advised of the traffic and reported he was looking for them. A ca/ca was never generated by stars; and both airplanes continued to their intended destinations.I feel that if I had so many airplanes on my frequency I would have been in a better position to recognize that aircraft X may not have been able to check in with me on his missed; and I therefore would have been able to turn him out of the way of aircraft Y. Additionally; if the tower had recognized the difference in aircraft performance they may have been able to provide more than the 3 miles (roughly) before clearing the high performance aircraft on the same heading as the slower piston. Also; requesting a heading to provide divergence off of the runway would have also solved the issue. With as much IFR training as we do and the tendency of some of the airplanes to not check in timely on their missed approach; I feel very fortunate in this situation that something more serious did not occur.

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Original NASA ASRS Text

Title: F11 Controller reports of a loss of separation with faster aircraft overtaking slower aircraft.

Narrative: Aircraft X was on an IFR flight plan performing practice instrument approaches at multiple airports in the Kape/Palm sector. Pilot was given standard missed (per LOA) from MLB airport of runway heading and maintain 2;000 feet upon completion of the ILS 9R approach. On the missed; the airplane was either not able to check in or was not recognized until 3-4 miles east of the field and leveling at 020. MLB had requested other releases prior to Aircraft X going missed; first one being Aircraft Y. Upon seeing a tag show up east of MLB I reached out to Aircraft X and instructed him to 'turn right heading 180 immediately-for traffic; and IDENT.' The pilot acknowledged and started the turn; however with the performance difference between Aircraft Y and Aircraft X I believe that separation was lost prior to Aircraft X establishing a divergent heading. Upon checking of FREQ; Aircraft Y was advised of the traffic and reported he was looking for them. A CA/CA was never generated by STARS; and both airplanes continued to their intended destinations.I feel that if I had so many airplanes on my frequency I would have been in a better position to recognize that Aircraft X may not have been able to check in with me on his missed; and I therefore would have been able to turn him out of the way of Aircraft Y. Additionally; if the Tower had recognized the difference in aircraft performance they may have been able to provide more than the 3 miles (roughly) before clearing the high performance aircraft on the same heading as the slower piston. Also; requesting a heading to provide divergence off of the runway would have also solved the issue. With as much IFR training as we do and the tendency of some of the airplanes to not check in timely on their missed approach; I feel very fortunate in this situation that something more serious did not occur.

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.