he Hacker A30 series motors are designed for Larger Parkflyers, 3D Aerobatic, and Scale models from 24oz to 60oz and utliize 2 to 4 series LiPoly batteries. The 14 pole outrunner type design creates MASSIVE TORQUE, therefore larger direct drive props can be used without the need for a gearbox. These motors feature oversized bearings, curved neo-magnets, and high-efficiency stator design. The A30 motors produce the most power at lower current consumption than other popular Outrunner designs.We recommend the Hacker X-Series Brushless Controllers for use with the A30 Series Motors For Airplanes up to 4,0 lbs and Gliders up to 7,0 lbs with Prop up to 14 inchs For more information go to: www.hacker-motor.com/images/Catalog09/Hacker-2009-WEB%209+10+11.pdf