Motors, batteries, and electric propulsion systems form the assembly responsible for converting electrical energy into motion in radio-controlled models. The selection and sizing of these components directly affect the model’s power, runtime, performance, and reliability.
Alex Baroni creates content about electric propulsion in model building by combining electronics fundamentals, motor and battery characteristics, measurements, testing, and practical applications in model aircraft, boats, cars, and other RC models.
Electric Motors in Model Building
Electric motors used in RC models have different operating characteristics, power ratings, speeds, and current consumption. Understanding these parameters helps you select the appropriate motor for each application.
Motors in practice: Do Brushless Motors Have Polarity? How to Identify the Wires and Reverse the Rotation — understand the connections of a brushless motor, learn how to identify its wires, and discover how to reverse the direction of rotation in propulsion systems used in RC models.
Brushed and Brushless Motors
Brushed and brushless motors have important differences in their construction, control, and performance. These characteristics also determine the type of electronic speed controller required to operate each system.
Brushless motors: What Is a Brushless Motor? Understanding Brushless Motors in RC Models — learn how brushless motors work, discover their main characteristics and advantages, and understand why these motors require an ESC to operate in radio control systems.
Batteries Used in RC Systems
Batteries supply the energy required by the motor and the model’s other electronic components. Voltage, capacity, discharge current, number of cells, and battery technology must be considered when configuring the system.
Batteries in practice: Digital Voltage Display: Quickly Check Your Batteries’ Voltage — discover a practical way to check the voltage of batteries used in RC models and monitor one of the power system’s most important electrical measurements.
LiPo Batteries and Safe Use
LiPo batteries are widely used in RC models because of their balance of capacity, weight, and current delivery. Their use requires careful attention to charging, storage, cell voltage, and safe discharge limits.
LiPo batteries: LiPo Batteries: What They Are, How They Work, and How to Use Them Safely — understand the main characteristics of LiPo batteries and the precautions required when using, charging, and storing them for RC applications.
Sizing an Electric Propulsion System
The motor, battery, ESC, and propeller—or another propulsion element—must work together as a compatible system. Proper sizing helps achieve the desired performance without exceeding the components’ electrical and thermal limits.
System sizing in practice: Can I Connect a Motor to a Battery with the Same Voltage but a Higher Current Capacity? — understand the relationship between voltage, battery capacity, and the current drawn by the motor, and discover why these parameters are important when selecting a power source for a propulsion system.
Measurements, Testing, and Performance
Measuring voltage, current, power, rotational speed, and energy consumption makes it possible to evaluate the propulsion system’s behavior. These tests help compare configurations, identify problems, and adjust the system to the model’s requirements.
Measurements in practice: How to Measure the Current Draw of a Brushless Motor with a Clamp Meter — learn how to measure the current drawn by a brushless motor and understand how this measurement helps evaluate the operation and sizing of the propulsion system.
This content is part of Alex Baroni’s Model Building and Radio Control section, which features content about RC systems, electronics applied to model building, motors, batteries, propulsion, construction, configuration, and the development of radio-controlled models.