1. Drone Anatomy

1

The Skeleton: Frame

The frame is the carrier for all electronic equipment. It determines the drone's purpose and durability.

• Material: Most FPV frames use 3K Carbon Fiber plates, balancing high strength with lightweight properties.

• Structure Types:

  • True X: The distance between the four motors to the center is equal. Perfect for racing and freestyle with the most balanced flight feel. (e.g., GEPRC MARK4)

  • Wide X: The left and right arms are spaced wider apart. Provides a clear view for the HD camera (no props in view) and more space for electronics. (e.g., GEPRC MARK5)

  • DeadCat: Front arms are swept back (resembling a dead cat lying flat). Designed to keep propellers out of the camera's view for cinematic footage. (e.g., MARK5 DC, Moz7)

  • Whoop (Ducted): Features protective ducts around the propellers. Ideal for safe indoor flying and filming near people. (e.g., Cinelog Series, Cinebot Series)

2

The Brain: Flight Controller (FC)

The FC is the intelligent core of the drone. It contains sensors like gyroscopes (to sense attitude) and accelerometers.

• Function: Calculates thousands of times per second to determine the drone's current angle and how to adjust motor speeds to keep it stable.

• Common Chips: F405 (cost-effective) and F722 (high performance).

• GEPRC Highlight: The TAKER Series FC (e.g., TAKER F722) features a full-coverage aluminum heatsink shell that protects sensitive components and helps prevent short circuits caused by debris.

3

The Heart: Electronic Speed Controller (ESC)

The ESC sits between the battery and the motors, acting as the power distribution center.

• Function: When the FC sends a command (e.g., "speed up the front-left motor"), the ESC converts the battery's DC power into the 3-phase AC power required by the motors, precisely controlling their speed.

• Form Factor: Modern FPV drones typically use a 4-in-1 ESC (four individual ESCs integrated into one board). It is stacked with the FC; together they're commonly called the "Stack".

• Specs: The amperage (A) rating indicates how much current it can handle. Example: a TAKER 50A ESC can sustain high current output, suitable for aggressive freestyle flying.

4

The Muscles: Brushless Motors

Motors provide the thrust for flight.

• Model Numbers (e.g., 2107.5):

  • The first two digits 21 represent the stator diameter (21mm).

  • The last two digits 07.5 represent the stator height (7.5mm).

  • Generally, larger size = higher torque and more power.

• KV Rating: Represents the increase in RPM for every 1V increase in voltage.

  • High KV (e.g., 2650KV): Faster rotation, typically for 4S batteries.

  • Low KV (e.g., 1850KV): Higher torque, typically for 6S batteries.

• GEPRC Representative: The SPEEDX2 Series, known for its hollow lightweight design and high impact resistance.

5

The Wings: Propellers

Propellers convert the motor's rotation into lift.

• Specs (e.g., 5146):

  • 5: Represents 5 inches (diameter).

  • 46: Represents the pitch (the distance the prop moves forward in one rotation). Higher pitch = higher top speed but more amp draw.

• Tri-blade vs. Pentablade:

  • Tri-blade (3 blades): High efficiency, great "pop" and response. Standard for freestyle.

  • Pentablade (5 blades): "Grippier" feel, quieter sound profile. Often used on cinewhoops for smoothness.

6

The Eyes: FPV System (Camera & VTX)

This is the soul of FPV (First Person View).

• Camera: Captures the video footage.

• VTX (Video Transmitter): Transmits the footage wirelessly to your goggles.

• Mainstream Options:

  • DJI O3 / O4 Air Unit: Digital HD system — currently the gold standard for image quality and range.

  • Analog VTX: Uses GEPRC RAD Series VTX. Lower image quality (TV static style) but offers extremely low latency and low cost.

7

The Ears: Receiver (RX)

The receiver listens to the commands sent from your remote controller on the ground.

• ELRS (ExpressLRS): Recommended open-source protocol. High refresh rates, long range, typically uses a T-shaped antenna.

• TBS Crossfire: Classic long-range choice (915MHz), also uses T-shaped antennas.

• PNP (Plug and Play): Refers to using the DJI Air Unit's built-in receiver. If using a DJI Remote Controller (2 or 3), an external receiver may not be needed.

Hardware Connection Diagram (Stack System)

• (Diagram placeholder — original content referenced a stack/system diagram. Keep or insert diagram as appropriate in GitBook.)

When repairing or replacing parts, always pay attention to the installation direction of the stack. The arrow on the Flight Controller board must point towards the front of the drone. If installed incorrectly, configure the "Board Alignment" in Betaflight Configurator — otherwise the drone may flip over immediately upon takeoff.