With its low profile design, strong torque and precision movement, the HS-75BB is a great choice to move your retract gear in a realistic manner that you need. Note, this is a retract or “bang bang” servo and only travels from one end to the other (180 degrees). If you require a proportional servo this size, use the Hitec HS-77BB. Specifications
Motor Type: 3 Pole Bearing Type: Top Ball Bearing Speed (4.8V/6.0V): 0.45 / 0.34 sec @ 180 deg. Torque oz./in. (4.8V/6.0V): 92 / 114 Torque kg./cm. (4.8V/6.0V): 6.6 / 8.2 Size in Inches: 1.73 x 0.90 x 0.98 Size in Millimeters: 43.94 x 22.86 x 24.89 Weight ounces: 1.23 Weight grams: 34.87