How to Choose the Right Servo for Your RC Plane or Car
Choose a servo by the torque your model needs, then by size and gear type. A foam plane flies on 2.5 kg/cm from an SG92R, while a 1/10 drift car needs 12 kg.cm from an SPT4412LV. Large crawlers need 60 kg or more. The SG92R costs $8.00 and gives 2.5 kg/cm of torque at 4.8V.
Quick facts
| Fact | Value |
|---|---|
| SG92R torque | 2.5 kg/cm at 4.8V, $8.00 |
| SG90 torque | 1.8 kg/cm at 4.8V, per TowerPro |
| SPT4412LV torque | 12 kg.cm at 6V, $53.99 |
| DSSERVO torque classes | 60, 80, 150, and 160 kg |
| MG996R torque | 9.4 kg/cm at 4.8V, per TowerPro |
| Horn set | $8.37, 4-point aluminum 2-pack |
How much torque do you need?
Start from the job, not from the servo. A foam plane needs 0.6 to 2.5 kg/cm, while a 1/10 drift car needs 12 kg.cm.
The SG92R gives 2.5 kg/cm at 4.8V for foam planes and park flyers. The SPT4412LV gives 12 kg.cm at 6V for 1/10 drift cars.
A 1/5 crawler needs 60 kg or more at the steering servo. The DSSERVO range covers 60, 80, 150, and 160 kg classes.
What do micro, standard, and high-torque sizes mean?
Micro servos weigh 3.7g to 13g and suit foam planes and small cars. The SG50 weighs 5g, and the MG90D weighs 13g.
Standard servos weigh about 55g and suit 1/10 cars and larger planes. The MG996R weighs 55g and measures 40.7 by 19.7 by 42.9 mm.
High-torque servos use bigger motors and metal gears for crawlers. The DSSERVO range uses stainless steel gears in a CNC aluminum shell.
Should you pick metal or plastic gears?
Metal gears survive steering hits and hard landings that strip plastic gears. The SPT4412LV uses a large torsion metal gear for drift cars.
Plastic gears run quieter and cost less in light foam planes. The SG92R uses plastic composite gears and still gives 2.5 kg/cm at 4.8V.
Pick metal gears when the servo drives steering or a large surface. Pick plastic gears for a light park flyer with small loads.
What does digital vs analog change?
A digital servo holds position harder and answers faster than an analog servo. It suits steering and 3D flight where holding torque matters.
The DSM-44 is digital and moves in 0.07 sec per 60 degrees. The MG90D is digital too, with metal gears in a 13g case.
Analog servos cost less and suit trainers and slow scale models. Match the type to the job, not to the price tag.
How do you read a servo datasheet?
Read torque at your battery voltage first. The MG996R gives 9.4 kg/cm at 4.8V and 11 kg/cm at 6V, per its TowerPro datasheet.
Read speed as seconds per 60 degrees at the same voltage. The MG996R moves in 0.19 sec per 60 degrees at 4.8V.
Read stall current to size your power supply. The MG996R draws 1400mA at stall, so a weak BEC will brown out.
How the options compare
| Servo | Torque | Speed | Gears | Price |
|---|---|---|---|---|
| SG92R | 2.5 kg/cm at 4.8V | 0.1 sec per 60 deg at 4.8V | Plastic composite | $8.00 |
| SPT4412LV | 12 kg.cm at 6V | 0.09 sec per 60 deg at 6V | Metal | $53.99 |
| DSSERVO range | 60 to 160 kg | Not listed | Stainless steel | $53.24 to $56.69 |
| 4-point horn set | Accessory, not a servo | Not listed | Aluminum | $8.37 |
How do you pick the right servo in five steps?
- Weigh the model and measure the servo bay.
- Work out the torque the job needs from the table above.
- Pick metal gears for steering and large surfaces.
- Check the spline count against your servo arms.
- Test the servo on the bench before you install it.
Parts that fit this guide
In-stock parts ship from the New York, USA warehouse in 1-2 business days. Prices below are the live store prices we verified on November 10, 2026.
SG92R Analog Plastic Composite Gear Micro Servo ($8.00)
Micro servo at $8.00. It gives 2.5 kg/cm of torque at 4.8V with plastic composite gears.
4-Point Aluminum Servo Arm Horn Set with Rudder Angle Ball Link, RC Aircraft, 2-Pack ($8.37)
Aluminum horn set at $8.37. It is a 2-pack with a rudder angle ball link for aircraft.
DSSERVO High Torque Waterproof Digital Servo 60KG / 80KG / 150KG / 160KG for 1/5 1/6 Redcat HPI Baja 5B ($2.25)
High torque waterproof servo, listed from $53.24 to $56.69 by torque class. The $2.25 option is a hardware set only, not a servo.
Dilwe SPT4412LV 12KG Digital Servo Large Torsion Metal Gear for 1:10 RC Drift Car ($53.99)
Drift car servo at $53.99. It gives 12 kg.cm of stall torque and moves in 0.09 sec per 60 degrees at 6V.
Shop the full range: Servos at Quality RC Parts. See also: Related guide.
Frequently asked questions
What torque do I need for a foam plane?
Most foam planes fly on 0.6 to 2.5 kg/cm. The SG92R gives 2.5 kg/cm at 4.8V for larger park flyers.
What torque do I need for a 1/10 RC car?
About 12 kg.cm for a drift car. The SPT4412LV gives 12 kg.cm at 6V and costs $53.99.
Is a digital servo worth it for a beginner?
Yes, for steering and 3D flight. Digital servos hold position harder, and the MG90D costs $14.00.
How do I know if a servo fits my model?
Measure the bay and match the size class. A micro servo measures about 23 by 12 by 29 mm, while a standard servo measures about 41 by 20 by 37 mm.
Sources
Last updated: November 10, 2026.