How to Reverse a 3-Wire Brushless Motor

1. Identify the motor wires

  • Typically 3 wires connected to ESC
  • Colors may vary → A, B, C (or random colors)

2. Swap any two wires

  • Example: swap A and B, leave C unchanged
  • This reverses motor rotation direction

how to prevent motor burning

  • Don’t run 96 kHz unless you’re sure your ESC can handle it.
  • Set Motor Idle Throttle ~6% to prevent stalling.
  • Keep an eye on motor temperature after indoor flights (touch test). Warm = ok, too hot to touch = dangerous.
  • Avoid flying with props bent / rubbing ducts indoors (adds load).

What Does 1400KV Mean in an FPV Motor?

In FPV drones, KV is a motor specification that indicates the motor’s speed constant.

⚡ Definition of KV

  • KV (RPM/Volt) = How many Revolutions Per Minute (RPM) the motor will spin per 1 Volt applied, without any load (no propeller).

For example:

  • A 1400KV motor spins 1400 RPM per Volt.

  • If powered by a 4S LiPo (14.8 V):

    1400 KV × 14.8 V ≈ 20,720 RPM (no load)

🔧 What It Means in Practice

  1. Lower KV (e.g., 1400KV)

    • Spins slower per volt.
    • Provides more torque (good for larger props, longer flight times, heavy drones, cinewhoops).
    • Better for efficiency and carrying loads.

  2. Higher KV (e.g., 2800KV, 4000KV)

    • Spins faster per volt.
    • Provides less torque, but more speed.
    • Good for small props, racing, and high agility.

🛠️ Typical Use Cases

  • 1400KV motors are usually found on:
  • Cinewhoops with 3–5 inch props.
  • Long-range FPV drones where efficiency and endurance matter.
  • Drones designed to carry heavier cameras (e.g., GoPro).

✅ Summary:

A 1400KV FPV motor means the motor spins about 1400 RPM per volt (unloaded). It is a low-KV motor designed for larger props, more torque, and efficiency, rather than raw speed.

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