JR PROPO S8511 Standard-Size Servo with Metal Gears
The JR PROPO S8511 is a standard-size servo equipped with high-strength steel (nitrided) metal gears and a coreless motor, delivering reliable performance across a wide range of aircraft types—from scale models to aerobatic planes.
 
You can use this servo for planes of 50cc or smaller size.
With a torque output of 25 kg·cm and a speed of 0.1 sec/60°, this servo offers both power and responsiveness. The plastic case is reinforced for durability, and the gear shaft is supported by an enlarged metal bushing to reduce play and enhance stability. The S8511 is engineered to deliver high performance while maintaining excellent cost-effectiveness.
This servo also features computer programmability, allowing users to fine-tune holding power and damping to suit specific aircraft characteristics. The operational angle can be set to either 120° or 180°, and once programmed, the settings are stored directly in the servo—allowing use with other brands of transmitters while retaining the configured performance.
Specifications:
Stall Torque: 19.6 kg·cm (6.6V) 22.0 kg·cm (7.4V) 25.0 kg·cm (8.4V)
Speed (sec/60°):0.14 sec (6.6V) 0.12 sec (7.4V) 0.11 sec (8.4V)
 
Weight: 65 g 
Dimensions: 40 x 21 x 40.5 mm
Lead Length: 300 mm
Operating Voltage: 4.5V – 8.4V
 
Features:
Coreless Motor
Programmable Functionality
Full Metal Gears
Wide Voltage Compatibility
Dual Ball Bearings
Adjustable Operating Angle: 120° / 180° (150° via XBUS SERVO PROGRAMMER)(*Servo horn not included)