FPV Motor Specifications Explained: A Comprehensive Guide

FPV drones(FPV Motor Specifications Explained) require powerful motors to lift off the ground and perform acrobatic maneuvers. However, with so many different motor options available, it can be overwhelming to know which ones to choose. Understanding FPV motor specifications is crucial for selecting the right motor for your drone. In this guide, we will explain the most important FPV motor specifications and what they mean.

What are the key FPV motor specifications?

The key specifications for FPV motors include:

  • Stator size (diameter and height)
  • KV rating
  • Number of stator arms
  • Number of magnets
  • Shaft diameter and length
  • Weight
  • Max current draw
  • Max thrust
  • Efficiency

What does stator size mean?

Stator size refers to the diameter and height of the motor’s stator. The stator is the stationary part of the motor that contains the magnets and coils. Larger stator size generally means more power and torque.

What is KV rating?

KV rating is a measure of how many revolutions per minute (RPM) the motor will spin per volt applied. A higher KV rating means the motor will spin faster and produce less torque, while a lower KV rating means the motor will spin slower and produce more torque.

What is the number of stator arms?

The number of stator arms refers to the number of arms on the stator that the windings are wrapped around. The most common numbers of stator arms are 9, 12, and 14. More stator arms generally means better efficiency and smoother operation.

What is the number of magnets?

The number of magnets refers to the number of magnets on the rotor. More magnets generally mean more power and torque.

What is shaft diameter and length?

Shaft diameter and length refer to the diameter and length of the motor shaft. The shaft is the part of the motor that connects to the propeller. It is important to choose the correct shaft size for your propeller.

Why is weight an important specification?

Weight is an important specification because it affects the performance of the drone. Heavier motors require more power to lift off the ground, which can result in decreased flight time and performance.

What is max current draw?

Max current draw refers to the maximum amount of current the motor can draw before overheating or burning out. It is important to choose a motor with a max current draw that is compatible with your drone’s power system.

What is max thrust?

Max thrust refers to the maximum amount of force the motor can produce. Higher max thrust generally means more power and speed.

What is efficiency?

Efficiency refers to how well the motor converts electrical power into mechanical power. Higher efficiency means less wasted energy and better performance.


  • What do KV and RPM mean in FPV motor specifications?

KV (kilo volts) and RPM (rotations per minute) are both measures of how fast a motor can spin. KV is the measurement of the motor’s speed per volt of power applied, while RPM is the number of revolutions that the motor can make in one minute. Both measurements are important in determining the performance of an FPV motor.

  • What is the significance of the motor stator size in FPV motors?

The stator size in an FPV motor refers to the diameter and height of the stationary part of the motor that contains the copper windings. It is an essential factor in determining the power output of the motor, with larger stator sizes typically producing more torque. However, larger stator sizes also result in heavier motors.

  • What is the difference between a 3S and 4S battery in FPV motor specifications?

3S and 4S batteries are both lithium polymer batteries used to power FPV motors. The main difference between them is the number of cells they contain. A 3S battery has three cells connected in series, while a 4S battery has four cells connected in series. As a result, a 4S battery can provide a higher voltage output, resulting in increased motor performance.

  • How important is the motor shaft diameter in FPV motor specifications?

The motor shaft diameter is an essential specification in FPV motors as it determines the size of the propeller that can be used with the motor. A larger diameter shaft can handle more torque and is therefore suitable for larger, heavier propellers. Additionally, a larger diameter shaft also reduces the chance of the propeller slipping during flight.

  • What are the benefits of using high-quality bearings in FPV motors?

Using high-quality bearings in FPV motors can significantly improve the motor’s performance and lifespan. Good bearings help reduce friction, which in turn reduces heat buildup and wear on the motor. This results in smoother, more efficient operation and a longer lifespan for the motor. Additionally, high-quality bearings can also reduce motor noise and vibration.


FPV motor specifications can be overwhelming, especially for beginners. Understanding the significance of each specification is crucial in selecting the right motor for your FPV drone. Factors such as the motor’s KV and RPM, stator size, battery compatibility, shaft diameter, and bearing quality can all have a significant impact on the motor’s performance and durability. By carefully considering these specifications, you can ensure that you choose the best motor for your FPV drone and achieve optimal flight performance.

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