Inrunner 12x20mm with gearbox. Suitable for larger indoor models or parkfliers. At just over 200gram thrust with a 9x6 prop this setup packs some serious power.
Specifications:
Weight: 25g with gearbox
Output shaft diamter:3mm (threaded)
Max continuous current: 6A (7A/15sec burst)
Recommended props:
2-cell use: 9x5, 9x6