https://alexnld.com/product/gdw-ds298mg-9-1kg-60-degree-high-torque-metal-gear-digital-servo-for-rc-airplane-fixed-wing-glider-helicopter-rc-boat-robot/?hilite="SPT Servo SPT5835W-270 35KG Large Torque Brushless Waterproof Digital Servo for RC Car Robot Airplane Helicopter"