Futaba S9157 High Torque Servo is ideal for large competition airplanes. Coreless motor. Dual ball bearings and metal gears. Metal middle case helps dissipate heat for cooler operation. One year limited warranty.

Use with NiCD batteries only
A note on Coreless motors: Conventional servo motors have a steel core armature wrapped with wire that spins inside the magnets. In a Coreless design, the armature uses a thin wire mesh that forms a cup that spins around the outside of the magnet eliminating the heavy steel core. This design results in smoother operation and faster response time.