According to the model using the steering gear:
The aviation model steering gear requires high speed and high precision ; the navigation model steering gear requires waterproof and large torque ; the vehicle model steering gear requires large torque and certain waterproof capability.
According to the steering gear model, it is divided into analog steering gear and digital steering gear; the analog steering gear is slightly slower; the digital steering gear is relatively fast.
According to the gear used, it is divided into plastic gear steering gear and metal gear steering gear;
The gear of the plastic gear is slightly inferior, but it is cheap and power-saving . The metal gear servo generally has a large torque and high strength, but it is expensive and expensive.
Divided by size (empty mode): standard steering gear 9g steering gear 8g steering aileron steering gear;
Standard steering gear is larger
As shown below, the picture shows the X-TEAM 6122 servo. 
9g steering gear is much smaller
(The picture above shows the X-TEAM 1109HB 9g servo)
Aileron servo is relatively easily into thin flat wing but wider than the standard rudder.
By zoning (oil movable wing): throttle servo aileron servo fin / flat Rudder;
Throttle servos do not require excessive torque, require reliable gears and reliable steering gears because the engine throttle is the most vibrating part of the entire aircraft.
The aileron servos are required in terms of size and accuracy, and the vertical tail /flat tail servos require high torque and high precision.
More steering gear knowledge is available on the X-TEAM website:
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