Start servo selection with the mechanism and its load. Compare torque, speed, power requirements and installation space under consistent conditions to turn specification values into reliable motion.
For a force acting perpendicular to the servo arm, torque is T = F × r. Include acceleration, shock, friction and the least favourable operating position. One kg·cm is approximately 0.0981 N·m. Stall torque is measured with the shaft prevented from rotating; it is not a continuous output rating. Check rated torque at its stated voltage, then validate temperature rise and the duty cycle on a prototype.
No-load speed is commonly expressed as seconds per 60° of travel: a smaller value means faster unloaded movement. It does not specify loaded response, positioning accuracy or system-level control performance. The selector can compare a specific test voltage; missing measurements are not interpolated. Before increasing the supply voltage, check the limits of the servo, regulator and control equipment.
Running current and stall current describe different operating conditions. Several servos starting, reversing or meeting resistance together can create substantial current peaks. Assess the BEC or separate supply against the motion sequence, cable length, voltage drop and connector capacity. Begin with current-limited testing, increase the load gradually and monitor voltage and temperature so a supply-related reset is not mistaken for a signal fault.
Match body size, mounting-hole spacing, shaft height, horn and linkage clearance. PWM frame rate and pulse width are separate parameters; the listed 1520 µs reference pulse and the 1500 µs centre in the position table also need to be checked separately. Set centre and safe travel with the linkage disconnected, then verify both end stops after assembly. Do not infer an IP rating or gear material from a model suffix.
Lightweight platforms are often limited by mass and installation space. Micro servos are a useful starting point for small control surfaces and compact linkages. Required torque still depends on the load, lever arm and movement speed, so compare specifications at the intended supply voltage.
Mini servos offer additional torque options within a compact envelope. Check output-shaft position, mounting-hole spacing and connector clearance together. A longer servo arm reduces available linkage force; model names and peak torque alone do not establish compatibility.
Wing installations need clearance for the arm, linkage and cable as well as the servo body. Aileron and flap loads change with flight conditions. Size the linkage for the maximum design load and validate mounting stiffness and centring in the assembled system.
Standard servos cover RC steering, control surfaces and general mechanisms, but similar dimensions can conceal large differences in torque, speed and current. Establish the load, duty cycle and power capacity first, then compare gear and motor configurations rather than selecting on peak torque alone.
Low-profile housings suit chassis with limited installation height. Fast steering depends on servo speed, tyre loads, steering geometry and voltage drop together. Verify spline, arm and receiver-signal compatibility, and set travel limits to prevent the linkage from holding the servo stalled.
For high-load positioning, prioritise rated torque, peak current and structural stiffness. Stall torque is not a continuous-duty rating. Robotic joints also require system validation of inertia, acceleration, duty cycle and mechanical protection.
Stall torque is not a continuous load rating. Consider rated torque and duty cycle when sizing the mechanism. The operating range specifies allowable supply voltage; it does not imply that test data exist at every voltage.
Compare dimensions, supply voltage, torque and speed to select a servo for aircraft control surfaces, RC steering or robotic mechanisms. Each model includes performance at specific test voltages, mounting drawings and Chinese and English documentation to support integration.
Light aircraft control surfaces / compact mechanisms
Comparison voltage: 7.4 V
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RC steering / control surfaces and mechanisms
Comparison voltage: 8.4 V
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Robotic joints / high-load positioning
Comparison voltage: 16.8 V
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