The Hacker B20 15L Brushless Motor is specially designed for Parkflyers under 18oz. A high performance upgrade for ant "400" powered model. Available in direct drive (2 oz) or with 4:1 Planetary Gearbox (2.4 oz). It can be installed into factory gearboxes and also be used in Pylon Racers, Sailplanes, and Aerobatic Models.