S3115 High Torque Nylon Gear Micro Servo from Futaba - FUTM0415
This S3115 nylon gear micro servo works well for 1400 to 2000mm wingspan airplanes, medium and large EDF jets, and 500 sizes helicopters.  Great torque for these size of aircraft.
Features:

Quality standard servo perfect for 1400 to 2000mm wingspan airplanes, medium and large EDF jets, and 500 sizes helicopters
One year warranty

Includes:

1x S3115 high torque nylon gear micro servo
1x 1" (25.4mm) 4 arm servo horn (installed on servo)
1x 1.5" (39mm) 4 arm servo horn
1x 1.75" (45mm) straight servo horn
1x 1.4" (35mm) diameter round servo horn
2x eyelets
2x rubber grommets
2x 2x12mm washer head self threading screws (phillips head)