2pcs 8.5mm x 20mm 8520 Coreless Motor CW+CCW | DC 3.7V 50000RPM for RC Drone Quadcopter

Get your RC drone or quadcopter back in the air with this set of two high-speed 8520 coreless motors. Each motor is designed for powerful and responsive flight, giving you the thrust you need for agile maneuvers and stable hovering. This pack includes one clockwise (CW) and one counter-clockwise (CCW) motor, making it a direct replacement for many popular micro drone builds.

These motors run on a standard 3.7V DC battery and reach an impressive 50,000 RPM at no load. They feature a built-in cooling hole to help manage heat during operation, which is essential for maintaining performance during longer flights. The compact 8.5mm diameter and 20mm length fit neatly into tight motor mounts, making them a great choice for DIY projects or repairs.

Each motor is built with high-strength neodymium-iron-boron (NdFeB) magnets for strong torque and reliable power delivery. The output shaft is a flat-sided D-shape, which is ideal for securing propellers or connecting to gear reduction units commonly found in RC helicopters and drones. The wires are color-coded (red-blue and white-black) for easy and correct polarity connection to your flight controller or ESC.

These motors are designed for high power density, meaning they deliver a lot of thrust for their size. Because of this, they generate heat during use, which is normal for RC model motors operating in well-ventilated environments. They are not designed for continuous, non-stop operation, so allow them to cool between flights for the best lifespan and performance.

Key Features and Benefits

- CW+CCW Pair: Provides balanced thrust for stable and controlled flight in multi-rotor drones.

• High Speed 50,000 RPM: Delivers quick throttle response and powerful lift for agile flying.

• Cooling Hole Design: Helps dissipate heat during operation to maintain consistent performance.

• Compact 8520 Size: Fits standard micro drone frames and is easy to install in tight spaces.

• D-Shaped Flat Shaft: Offers a secure grip for propellers and gears, preventing slippage during high-speed rotation.

Who Is This For

- RC drone and quadcopter hobbyists looking for replacement motors for their micro builds.

• DIY makers and engineers building custom small-scale flying robots or RC aircraft.

• Repair technicians or enthusiasts fixing crashed or worn-out drone motors.

• Anyone experimenting with high-speed coreless motors for lightweight RC projects.

Usage Scenario

After a rough landing, your micro quadcopter lost power on one side. You found the original motor was no longer spinning smoothly. You ordered this 2-pack of CW and CCW 8520 motors. Swapping out the damaged motor was straightforward—just solder the new wires to the correct pads on the flight controller. Now your drone lifts off with balanced power and zips through the air with the same agility as when it was new.

Micro Comparison

While some generic motors may offer similar RPM ratings, these 8520 motors are specifically designed with a D-shaped shaft for a more secure connection to drone propellers and gears. The inclusion of a cooling hole is a practical feature that helps manage heat better than many basic solid-shaft motors. This pair is a reliable choice for restoring or enhancing the performance of your micro quadcopter.

Specifications

Motor Outer Diameter: 8.5 mm

Motor Length: 20 mm

Output Shaft Diameter: 1.2 mm (with flat side: 0.95 mm)

Output Shaft Length: Approximately 5.3 mm

Motor Wire Length: Over 150 mm

Motor Weight: Approximately 5.5 grams

Rated Input Voltage: DC 3.7V

Base RPM: 50,000 RPM (at 3.7V no-load)

No-load Current at 3.7V: 0.26 A

Package Includes

- 1 x Red-blue cable motor (CW)

• 1 x White-black cable motor (CCW)