26d • General discussion
Motors and what not
RC cars, planes, and boats primarily use electric brushless motors for high efficiency and power, though brushed motors are still used in entry-level models. Brushless motors (often BLDC or 3-phase) come in inrunner (high RPM) and outrunner (high torque) types. Nitro/gas glow engines are also popular for specialized, large-scale planes and boats.
Common Motor Types by Application
- RC Cars: Usually 540-size brushless or brushed motors. High-torque brushless systems are preferred for speed, while brushless rock crawling often uses lower KV brushless motors.
- RC Planes: Mostly brushless outrunners, which provide the high torque necessary for turning large propellers, such as the E-flite Park 180.
- RC Boats: High-RPM brushless motors, frequently water-cooled to handle the heat, like the Spektrum Firma 2000Kv.
Key Motor Categories
- Brushless Motors: More modern, efficient, and durable (no brushes to wear out). They require a specialized Electronic Speed Controller (ESC).
- Brushed Motors: Found in cheaper or older "Ready-to-Run" models. They are simple but less efficient.
- Nitro/Glow Engines: Internal combustion engines (2-stroke or 4-stroke) fueled by nitro methane/oil mixes, commonly used in larger, high-performance hobby models.
Key Technical Terms
- KV Rating: Indicates RPM per volt (\(RPM/V\)). Higher KV means higher speed but lower torque.
- Outrunner: The outer casing rotates, providing high torque. Common for planes.
- Inrunner: The inner rotor rotates. Common for cars and boats.
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Motors and what not
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