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How do drones fly?

How do drones fly? The mechanics of propeller flight

Drones, specifically quadcopters, have revolutionised aerial photography and videography. Unlike traditional remote-control (RC) airplanes, which require extensive runway space for takeoff and landing, drones can hover, take off vertically, and turn with ease. But how do they work? Let’s dive into how drones fly, the mechanics of quadcopter flight and explore what makes drones the preferred choice for many aerial filmmakers.

The Basics of Quadcopter Flight

Quadcopters, the most common type of drone, have four propellers arranged in a square configuration. These propellers are controlled by a flight controller, which adjusts their speed to maintain stability and movement. Here’s how they work:

  • Lift and Hovering: All four propellers spin to generate lift, allowing the drone to hover in place.
  • Pitch (Forward/Backward Movement): The rear propellers spin faster than the front ones to tilt the drone forward and move it ahead.
  • Roll (Side-to-Side Movement): Speeding up the propellers on one side tilts the drone sideways, moving it in that direction.
  • Yaw (Rotation): By spinning two propellers clockwise and the other two counterclockwise, the drone can rotate left or right.
Drone propellor positions

Quadcopter propellers are supplied in two different orientations: clockwise (CW) and counterclockwise (CCW). Opposing pairs of propellers rotate in opposite directions to counteract torque effects and maintain stability.

If all four propellers spun in the same direction, the drone would spin uncontrollably rather than staying balanced. This opposing rotation is key to ensuring smooth and predictable flight behavior.

Modern drones use sensors, including gyroscopes and accelerometers, to make thousands of tiny adjustments every second, keeping the flight smooth and stable.

In this image you can see the rear-left propellers, which have a small notch, signifying that they are Propeller type A. The front-right propellers must match. Propeller type B will be designed to spin in the opposite direction. For ease of identification and fitting, they will not have the notch.

Why Are Drones Easier to Fly Than RC Planes?

Traditional RC planes require significant skill to operate, mainly due to their dependence on airspeed and lift generated by their fixed wings. They also require a large open space for takeoff and landing. In contrast, drones offer several advantages:

  • Vertical Takeoff and Landing (VTOL): Drones can launch from almost anywhere without the need for a runway.
  • Autonomous Stabilisation: Built-in sensors and GPS allow drones to hover in place and self-correct, reducing the need for constant manual control.
  • Obstacle Avoidance: Many modern drones feature sensors to detect and avoid obstacles, further easing the flying process.

Limitations of Drone Flight

Despite their impressive capabilities, drones do have limitations that pilots should be aware of:

Weather Conditions

  • Wind: Strong winds can make it difficult for drones to maintain stability. While high-end drones have advanced stabilisation, extreme gusts can still push them off course. The smaller the drone, the less wind resistance it will provide. For most drones, any winds over 25 mph will cause issues, and may even result in a 'flyaway'.
  • Rain and Moisture: Most consumer drones are not waterproof, and exposure to rain can damage their electronics or interfere with sensors.

Obstacle Avoidance Systems

Drones come equipped with obstacle avoidance technology, but these systems have their own limitations:

  • Vision Sensors: Cameras detect obstacles but may struggle in low-light conditions.
  • Infrared Sensors: Good for detecting objects in darkness but have limited range.
  • Ultrasonic Sensors: Work well at short distances but can be confused by reflective surfaces like water or glass.

Drone Flight Modes

Modern drones offer different flight modes to suit various needs, whether you're capturing cinematic footage or enjoying a fast-paced flying experience.

  • Cinematic Mode: Found in DJI drones and other high-end models, this mode slows down drone movements for smoother, more professional-looking video. It reduces abrupt motions, making it ideal for storytelling and high-quality cinematography.
  • FPV (First-Person View) Mode: In FPV mode, the drone’s gimbal reacts differently, allowing for a more immersive and dynamic flying experience. This is popular among drone racers and action filmmakers looking for a fast-paced, adrenaline-fueled perspective.

Conclusion

Drones have transformed aerial filming by making flight more accessible and user-friendly. As processing power continues to rise, so has the power of the software controlling the drone, providing a wide array of advanced filming techniques in an easy to control aerial vehicle.

Curious about the drones we use? → See Our Fleet. Still have questions? → Visit our FAQ.